1
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Babikov D, Burke MP, Casavecchia P, Green WH, Grinberg Dana A, Guo H, Heard DE, Heathcote D, Hochlaf M, Jasper AW, Klippenstein SJ, Lester MI, Martí C, Mebel AM, Mullin AS, Nguyen TL, Olzmann M, Orr-Ewing AJ, Osborn DL, Robertson PA, Robinson MS, Shannon RJ, Shiels OJ, Suits AG, Taatjes CA, Troe J, Xu X, You X, Zhang F, Zhang RM, Zádor J. Collisional energy transfer: general discussion. Faraday Discuss 2022; 238:121-143. [PMID: 36200457 DOI: 10.1039/d2fd90048c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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2
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Liaros N, Gutierrez Razo SA, Thum MD, Ogden HM, Zeppuhar AN, Wolf S, Baldacchini T, Kelley MJ, Petersen JS, Falvey DE, Mullin AS, Fourkas JT. Elucidating complex triplet-state dynamics in the model system isopropylthioxanthone. iScience 2022; 25:103600. [PMID: 35005547 PMCID: PMC8717599 DOI: 10.1016/j.isci.2021.103600] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2021] [Revised: 11/10/2021] [Accepted: 12/03/2021] [Indexed: 11/19/2022] Open
Abstract
We introduce techniques for probing the dynamics of triplet states. We employ these tools, along with conventional techniques, to develop a detailed understanding of a complex chemical system: a negative-tone, radical photoresist for multiphoton absorption polymerization in which isopropylthioxanthone (ITX) is the photoinitiator. This work reveals that the same color of light used for the 2-photon excitation of ITX, leading to population of the triplet manifold through intersystem crossing, also depletes this triplet population via linear absorption followed by reverse intersystem crossing (RISC). Using spectroscopic tools and kinetic modeling, we identify the reactive triplet state and a non-reactive reservoir triplet state. We present compelling evidence that the deactivation channel involves RISC from an excited triplet state to a highly vibrationally excited level of the electronic ground state. The work described here offers the enticing possibility of understanding, and ultimately controlling, the photochemistry and photophysics of a broad range of triplet processes.
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Affiliation(s)
- Nikolaos Liaros
- Department of Chemistry & Biochemistry, University of Maryland, College Park, MD 20742, USA
| | | | - Matthew D. Thum
- Department of Chemistry & Biochemistry, University of Maryland, College Park, MD 20742, USA
| | - Hannah M. Ogden
- Department of Chemistry & Biochemistry, University of Maryland, College Park, MD 20742, USA
| | - Andrea N. Zeppuhar
- Department of Chemistry & Biochemistry, University of Maryland, College Park, MD 20742, USA
| | - Steven Wolf
- Department of Chemistry & Biochemistry, University of Maryland, College Park, MD 20742, USA
| | | | | | - John S. Petersen
- Department of Chemistry & Biochemistry, University of Maryland, College Park, MD 20742, USA
- imec, Kapeldreef 75, 3001 Leuven, Belgium
| | - Daniel E. Falvey
- Department of Chemistry & Biochemistry, University of Maryland, College Park, MD 20742, USA
| | - Amy S. Mullin
- Department of Chemistry & Biochemistry, University of Maryland, College Park, MD 20742, USA
| | - John T. Fourkas
- Department of Chemistry & Biochemistry, University of Maryland, College Park, MD 20742, USA
- Institute for Physical Science & Technology, University of Maryland, College Park, MD 20742, USA
- Maryland Quantum Materials Center, University of Maryland, College Park, MD 20742, USA
- Maryland NanoCenter, University of Maryland, College Park, MD 20742, USA
- Corresponding author
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3
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Laskowski MR, Michael TJ, Ogden HM, Alexander MH, Mullin AS. Rotational energy transfer kinetics of optically centrifuged CO molecules investigated through transient IR spectroscopy and master equation simulations. Faraday Discuss 2022; 238:87-102. [DOI: 10.1039/d2fd00068g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A combined experimental and theoretical study of quantum state-resolved rotational energy transfer kinetics of optically centrifuged CO molecules is presented. In the experiments, inverted rotational distributions of CO in rotational...
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Aerssens J, Burke MP, Cavallotti C, Green NJB, Green WH, Guo H, Heard D, Hochlaf M, Jasper AW, Klippenstein SJ, Kuwata KT, Lawrence JE, Mebel AM, Mullin AS, Nguyen TL, Olzmann M, Osborn DL, Pfeifle M, Plane JMC, Robertson PA, Robertson SH, Salzburger M, Seakins PW, Shannon RJ, Shiels OJ, Trevitt AJ, Vallance C, Welz O, Xu X, Zádor J, Zhang RM. The master equation: general discussion. Faraday Discuss 2022; 238:529-574. [DOI: 10.1039/d2fd90050e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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5
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Bodi A, Burke MP, Butler AA, Douglas K, Eskola AJ, Green WH, Guo H, Heard DE, Heathcote D, Hochlaf M, Klippenstein SJ, Kuwata KT, Lawrence JE, Lester MI, Lourderaj U, Mebel A, Milesevic D, Mullin AS, Nguyen TL, Olzmann M, Orr-Ewing AJ, Osborn DL, Pazdera TM, Pfeifle M, Plane JMC, Pun R, Robertson PA, Robinson MS, Seakins PW, Shannon RJ, Taatjes CA, Troe J, Vallance C, Welz O, Zádor J, Zhang F. Impact of Lindemann and related theories: general discussion. Faraday Discuss 2022; 238:700-740. [DOI: 10.1039/d2fd90051c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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6
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Burke MP, Casavecchia P, Cavallotti C, Clary DC, Doner A, Green WH, Grinberg Dana A, Guo H, Heathcote D, Hochlaf M, Klippenstein SJ, Kuwata KT, Lawrence JE, Lourderaj U, Mebel AM, Milesevic D, Mullin AS, Nguyen TL, Olzmann M, Orr-Ewing AJ, Osborn DL, Pazdera TM, Robertson PA, Robinson MS, Rotavera B, Seakins PW, Shannon RJ, Shiels OJ, Suits AG, Trevitt AJ, Troe J, Vallance C, Welz O, Zhang F, Zádor J. The reaction step: general discussion. Faraday Discuss 2022; 238:320-354. [DOI: 10.1039/d2fd90049a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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7
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Michael TJ, Ogden HM, Mullin AS. State-resolved rotational distributions and collision dynamics of CO molecules made in a tunable optical centrifuge. J Chem Phys 2021; 154:134307. [PMID: 33832253 DOI: 10.1063/5.0038372] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
State-resolved distributions and collision dynamics of optically centrifuged CO molecules with orientated angular momentum are investigated by probing the CO J = 29-80 rotational levels using high-resolution transient IR absorption spectroscopy. An optical centrifuge with tunable bandwidth is used to control the extent of rotational excitation in the sample. The rotational distributions are inverted with a maximum population in J = 62. Rotational levels with J > 62 have populations that correlate with the intensity profile of the optical trap. The full bandwidth trap excites CO up to the J = 80 level, while J = 67 is the highest level observed in the reduced bandwidth trap. Polarization-sensitive transient spectroscopy shows that the initial orientational anisotropy is r = 0.8 for levels with J ≥ 55, while anisotropy values are near r = 0.4 for levels with J < 50. The rotational distribution for J > 50 is broadened slightly by collisions, consistent with small |ΔJ| propensity rules for rotational energy transfer. Doppler-broadened line profiles show that the J = 60-80 levels have translational temperatures near Ttrans = 300 K and that these temperatures remain constant for as much as 24 gas kinetic collisions. Doppler linewidths for levels with J < 60 are broadened by non-resonant rotation-to-translation energy transfer. Kinetic analysis of transient signals shows that collisions with thermal bath molecules are the predominant relaxation pathway.
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Affiliation(s)
- Tara J Michael
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
| | - Hannah M Ogden
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
| | - Amy S Mullin
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
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8
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Schatz GC, McCoy AB, Shea JE, Murphy CJ, Scholes G, Batista V, Bhattacharyya K, Bisquert J, Crawford D, Cuk T, Dickson R, Fairbrother H, Forsyth M, Fourkas J, Geiger F, Gewirth A, Goodson T, Goward GR, Guo H, Hartland GV, Jungwirth P, Link S, Liu GY, Liu ZP, Mennucci B, Minton T, Mullin AS, Prezhdo O, Schneider WF, Schwartz B, Snider N, Solomon G, Weitz E, Yang X, Yethiraj A, Zaera F, Zanni M, Zhang J, Zhong H, Zwier T. The JPC Periodic Table. J Phys Chem B 2019; 123:5973-5984. [DOI: 10.1021/acs.jpcb.9b03463] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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9
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Schatz GC, McCoy AB, Shea JE, Murphy CJ, Scholes G, Batista V, Bhattacharyya K, Bisquert J, Crawford D, Cuk T, Dickson R, Fairbrother H, Forsyth M, Fourkas J, Geiger F, Gewirth A, Goodson T, Goward GR, Guo H, Hartland GV, Jungwirth P, Link S, Liu GY, Liu ZP, Mennucci B, Minton T, Mullin AS, Prezhdo O, Schneider WF, Schwartz B, Snider N, Solomon G, Weitz E, Yang X, Yethiraj A, Zaera F, Zanni M, Zhang J, Zhong H, Zwier T. The JPC Periodic Table. J Phys Chem A 2019; 123:5837-5848. [PMID: 31315402 DOI: 10.1021/acs.jpca.9b03461] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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11
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Ogden HM, Michael TJ, Murray MJ, Liu Q, Toro C, Mullin AS. The effect of CO rotation from shaped pulse polarization on reactions that form C2. Phys Chem Chem Phys 2019; 21:14103-14110. [DOI: 10.1039/c8cp06917d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The effect of CO rotational energy on bimolecular reactions to form electronically excited C2 is reported here.
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Affiliation(s)
- Hannah M. Ogden
- Department of Chemistry and Biochemistry
- University of Maryland
- College Park
- USA
| | - Tara J. Michael
- Department of Chemistry and Biochemistry
- University of Maryland
- College Park
- USA
| | | | - Qingnan Liu
- National Institute of Standards and Technology
- Gaithersburg
- USA
| | - Carlos Toro
- Department of Chemistry and Biochemistry
- University of Maryland
- College Park
- USA
| | - Amy S. Mullin
- Department of Chemistry and Biochemistry
- University of Maryland
- College Park
- USA
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12
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Murray MJ, Ogden HM, Mullin AS. Importance of rotational adiabaticity in collisions of CO2 super rotors with Ar and He. J Chem Phys 2018; 148:084310. [DOI: 10.1063/1.5009440] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Matthew J. Murray
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
| | - Hannah M. Ogden
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
| | - Amy S. Mullin
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
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13
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Murray MJ, Ogden HM, Mullin AS. Anisotropic kinetic energy release and gyroscopic behavior of CO2super rotors from an optical centrifuge. J Chem Phys 2017; 147:154309. [DOI: 10.1063/1.4997701] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Matthew J. Murray
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
| | - Hannah M. Ogden
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
| | - Amy S. Mullin
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
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14
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Murray MJ, Ogden HM, Toro C, Liu Q, Mullin AS. Impulsive Collision Dynamics of CO Super Rotors from an Optical Centrifuge. Chemphyschem 2016; 17:3692-3700. [DOI: 10.1002/cphc.201600871] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2016] [Revised: 09/28/2016] [Indexed: 11/08/2022]
Affiliation(s)
- Matthew J. Murray
- Department of Chemistry and Biochemistry University of Maryland College Park MD USA
| | - Hannah M. Ogden
- Department of Chemistry and Biochemistry University of Maryland College Park MD USA
| | - Carlos Toro
- Department of Chemistry and Biochemistry University of Maryland College Park MD USA
| | - Qingnan Liu
- National Institute of Standards and Technology 100 Bureau Drive, Stop 8320 Gaithersburg MD 20899 USA
| | - Amy S. Mullin
- Department of Chemistry and Biochemistry University of Maryland College Park MD USA
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15
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Murray MJ, Ogden HM, Toro C, Liu Q, Burns DA, Alexander MH, Mullin AS. State-Specific Collision Dynamics of Molecular Super Rotors with Oriented Angular Momentum. J Phys Chem A 2015; 119:12471-9. [DOI: 10.1021/acs.jpca.5b07941] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Matthew J. Murray
- Department
of Chemistry and
Biochemistry, University of Maryland, College Park, Maryland 20742, United States
| | - Hannah M. Ogden
- Department
of Chemistry and
Biochemistry, University of Maryland, College Park, Maryland 20742, United States
| | - Carlos Toro
- Department
of Chemistry and
Biochemistry, University of Maryland, College Park, Maryland 20742, United States
| | - Qingnan Liu
- Department
of Chemistry and
Biochemistry, University of Maryland, College Park, Maryland 20742, United States
| | - David A. Burns
- Department
of Chemistry and
Biochemistry, University of Maryland, College Park, Maryland 20742, United States
| | - Millard H. Alexander
- Department
of Chemistry and
Biochemistry, University of Maryland, College Park, Maryland 20742, United States
| | - Amy S. Mullin
- Department
of Chemistry and
Biochemistry, University of Maryland, College Park, Maryland 20742, United States
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16
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Mullin AS, Fourkas JT. The International Year of Light and the Chemistry Classroom. J Phys Chem Lett 2015; 6:3882-3883. [PMID: 26722887 DOI: 10.1021/acs.jpclett.5b01842] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Affiliation(s)
- Amy S Mullin
- Department of Chemistry & Biochemistry University of Maryland , College Park, Maryland 20742, United States
| | - John T Fourkas
- Department of Chemistry & Biochemistry University of Maryland , College Park, Maryland 20742, United States
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17
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Echebiri GO, Smarte MD, Walters WW, Mullin AS. Performance of a high-resolution mid-IR optical-parametric-oscillator transient absorption spectrometer. Opt Express 2014; 22:14885-14895. [PMID: 24977583 DOI: 10.1364/oe.22.014885] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We report on a mid-IR optical parametric oscillator (OPO)-based high resolution transient absorption spectrometer for state-resolved collisional energy transfer. Transient Doppler-broadened line profiles at λ = 3.3 μm are reported for HCl R7 transitions following gas-phase collisions with vibrationally excited pyrazine. The instrument noise, analyzed as a function of IR wavelength across the absorption line, is as much as 10 times smaller than in diode laser-based measurements. The reduced noise is attributed to larger intensity IR light that has greater intensity stability, which in turn leads to reduced detector noise and better frequency locking for the OPO.
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18
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Du J, Sassin NA, Havey DK, Hsu K, Mullin AS. Full State-Resolved Energy Gain Profiles of CO2 from Collisions with Highly Vibrationally Excited Molecules. II. Energy-Dependent Pyrazine (E = 32 700 and 37 900 cm–1) Relaxation. J Phys Chem A 2013; 117:12104-15. [DOI: 10.1021/jp404939s] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Juan Du
- Department of Chemistry & Biochemistry, University of Maryland, College Park, Maryland 20742, United States
| | - Nicholas A. Sassin
- Department of Chemistry & Biochemistry, University of Maryland, College Park, Maryland 20742, United States
| | - Daniel K. Havey
- Department of Chemistry & Biochemistry, University of Maryland, College Park, Maryland 20742, United States
| | - Kailin Hsu
- Department of Chemistry & Biochemistry, University of Maryland, College Park, Maryland 20742, United States
| | - Amy S. Mullin
- Department of Chemistry & Biochemistry, University of Maryland, College Park, Maryland 20742, United States
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Affiliation(s)
- Carlos Toro
- a Department of Chemistry & Biochemistry , University of Maryland , College Park , MD , 20742 , USA
| | - Qingnan Liu
- a Department of Chemistry & Biochemistry , University of Maryland , College Park , MD , 20742 , USA
| | - Geraldine O. Echebiri
- a Department of Chemistry & Biochemistry , University of Maryland , College Park , MD , 20742 , USA
| | - Amy S. Mullin
- a Department of Chemistry & Biochemistry , University of Maryland , College Park , MD , 20742 , USA
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20
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Abstract
We have constructed an optical centrifuge with a pulse energy that is more than 2 orders of magnitude larger than previously reported instruments. This high pulse energy enables us to create large enough number densities of molecules in extreme rotational states to perform high-resolution state-resolved transient IR absorption measurements. Here we report the first studies of energy transfer dynamics involving molecules in extreme rotational states. In these studies, the optical centrifuge drives CO2 molecules into states with J ∼ 220 and we use transient IR probing to monitor the subsequent rotational, translational, and vibrational energy flow dynamics. The results reported here provide the first molecular insights into the relaxation of molecules with rotational energy that is comparable to that of a chemical bond.
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Affiliation(s)
- Liwei Yuan
- Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742
| | - Samuel W. Teitelbaum
- Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742
| | - Allison Robinson
- Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742
| | - Amy S. Mullin
- Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742
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21
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Yuan L, Toro C, Bell M, Mullin AS. Spectroscopy of molecules in very high rotational states using an optical centrifuge. Faraday Discuss 2011; 150:101-11; discussion 113-60. [DOI: 10.1039/c0fd00021c] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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22
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Havey DK, Du J, Liu Q, Mullin AS. Full State-Resolved Energy Gain Profiles of CO2 (J = 2−80) from Collisions of Highly Vibrationally Excited Molecules. 1. Relaxation of Pyrazine (E = 37900 cm−1). J Phys Chem A 2009; 114:1569-80. [DOI: 10.1021/jp908934j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Daniel K. Havey
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742
| | - Juan Du
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742
| | - Qingnan Liu
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742
| | - Amy S. Mullin
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742
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23
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Liu Q, Havey DK, Li Z, Mullin AS. Effects of Alkylation on Deviations from Lennard−Jones Collision Rates for Highly Excited Aromatic Molecules: Collisions of Methylated Pyridines with HOD. J Phys Chem A 2009; 113:4387-96. [DOI: 10.1021/jp811077p] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Qingnan Liu
- Department of Chemistry and Biochemistry, University of Maryland College Park, Maryland 20705
| | - Daniel K. Havey
- Department of Chemistry and Biochemistry, University of Maryland College Park, Maryland 20705
| | - Ziman Li
- Department of Chemistry and Biochemistry, University of Maryland College Park, Maryland 20705
| | - Amy S. Mullin
- Department of Chemistry and Biochemistry, University of Maryland College Park, Maryland 20705
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24
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Du J, Yuan L, Hsieh S, Lin F, Mullin AS. Dynamics of Weak and Strong Collisions: Highly Vibrationally Excited Pyrazine (E = 37900 cm−1) with DCl. J Phys Chem A 2008; 112:9396-404. [DOI: 10.1021/jp802421f] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Juan Du
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742
| | - Liwei Yuan
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742
| | - Shizuka Hsieh
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742
| | - Felix Lin
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742
| | - Amy S. Mullin
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742
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25
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Liu Q, Havey DK, Mullin AS. Energy Transfer Dynamics in the Presence of Preferential Hydrogen Bonding: Collisions of Highly Vibrationally Excited Pyridine-h5, -d5, and -f5 with Water. J Phys Chem A 2008; 112:9509-15. [DOI: 10.1021/jp802326t] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Qingnan Liu
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742
| | - Daniel K. Havey
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742
| | - Amy S. Mullin
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742
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26
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Mullin AS. Book Review of Advances in Chemical Physics, Volume 138. J Am Chem Soc 2008. [DOI: 10.1021/ja805061g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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27
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Yuan L, Du J, Mullin AS. Energy-dependent dynamics of large-ΔE collisions: Highly vibrationally excited azulene (E=20390 and 38580cm−1) with CO2. J Chem Phys 2008; 129:014303. [DOI: 10.1063/1.2943668] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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28
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Havey DK, Liu Q, Li Z, Elioff M, Mullin AS. Collisions of Highly Vibrationally Excited Pyrazine (Evib = 37 900 cm-1) with HOD: State-Resolved Probing of Strong and Weak Collisions. J Phys Chem A 2007; 111:13321-9. [DOI: 10.1021/jp076023i] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Daniel K. Havey
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, and Department of Chemistry and Biochemistry, Boston University, Boston, Massachusetts 02215
| | - Qingnan Liu
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, and Department of Chemistry and Biochemistry, Boston University, Boston, Massachusetts 02215
| | - Ziman Li
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, and Department of Chemistry and Biochemistry, Boston University, Boston, Massachusetts 02215
| | - Michael Elioff
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, and Department of Chemistry and Biochemistry, Boston University, Boston, Massachusetts 02215
| | - Amy S. Mullin
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, and Department of Chemistry and Biochemistry, Boston University, Boston, Massachusetts 02215
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Liu Q, Du J, Havey DK, Li Z, Miller EM, Mullin AS. Alkylation effects on strong collisions of highly vibrationally excited alkylated pyridines with CO2. J Phys Chem A 2007; 111:4073-80. [PMID: 17388383 DOI: 10.1021/jp067743c] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The role of alkylation on the energy partitioning in strong collisions with CO2 was investigated for highly vibrationally excited 2-ethylpyridine (2EP) and 2-propylpyridine (2PP) prepared with E(vib) approximately 38,570 and 38,870 cm(-1), respectively, using lambda = 266 nm light. Nascent energy gain in CO2 (00(0)0) rotation and translation was measured with high-resolution transient absorption spectroscopy at lambda approximately 4.3 microm and the results are compared to earlier relaxation studies of pyridine (E(vib) = 37,950 cm(-1)) and 2-methylpyridine (2MP, Evib = 38,330 cm(-1)). Overall, the alkylated donors impart less rotational and translational energy to CO2 than does pyridine. 2PP consistently imparts more translational energy in collisions than does 2EP and has larger energy transfer rates. Of the alkylated donors, 2MP and 2PP have larger probabilities for strong collisional energy transfer than does 2EP. Two competing processes are discussed: donors with longer alkyl chains have lower average energy per mode and fewer strong collisions but longer alkyl chains increase donor flexibility, leading to higher state densities that enhance energy loss via strong collisions. A comparison of state density effects based on Fermi's Golden Rule shows that 2PP has more strong collisions than predicted while 2EP has fewer. The role of torsional motion in the hot donors is considered. Comparison of effective impact parameters shows that the alkylated donors undergo strong collisions with CO2 via a less repulsive part of the intermolecular potential than does pyridine.
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Affiliation(s)
- Qingnan Liu
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
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Havey DK, Liu Q, Li Z, Elioff M, Fang M, Neudel J, Mullin AS. Direct Determination of Collision Rates beyond the Lennard-Jones Model through State-Resolved Measurements of Strong and Weak Collisions. J Phys Chem A 2007; 111:2458-60. [PMID: 17388341 DOI: 10.1021/jp0712497] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
We describe a new approach for measuring absolute rates for molecular collisions including contributions of both strong and weak collisions. Elastic and inelastic collisions are monitored using high-resolution transient IR spectroscopy by measuring increases in the velocity distributions of individual rotational states of scattered molecules. Weak collisional energy transfer is detected by measuring velocity increases for the low-energy rotational states. This technique is illustrated for the collisional relaxation of highly vibrationally excited pyrazine (108 kcal/mol) with HOD. The observed collision rate is nearly twice the Lennard-Jones collision rate.
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Miller EM, Murat L, Bennette N, Hayes M, Mullin AS. Relaxation dynamics of highly vibrationally excited picoline isomers (E(vib) = 38 300 cm(-1)) with CO2: the role of state density in impulsive collisions. J Phys Chem A 2006; 110:3266-72. [PMID: 16509652 DOI: 10.1021/jp054762y] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Strong collisions of highly vibrationally excited picoline isomers and CO2 (00(0)0) were investigated using high resolution transient IR absorption probing to investigate the role of donor state density. Vibrationally excited 3-picoline and 4-picoline (3-methylpyridine and 4 methylpyridine) with E(vib) = 38300 cm(-1) were prepared by 266 nm excitation followed by rapid internal conversion. Transient IR probe measurements of the nascent rotational and translational energy gain in CO2 (00(0)0) show that large DeltaE collisions for 3- and 4-picoline are similar to those for excited 2-picoline. The probability distributions for the large DeltaE energy transfer of the three isomers have similar dependence on DeltaE. The results are compared with other earlier results demonstrating that the shape of the large DeltaE probability distribution correlates with the DeltaE dependence of the donor vibrational state density. The results are discussed in terms of the GRETCHEN model for collisional relaxation.
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Affiliation(s)
- Elisa M Miller
- Department of Chemistry, Metcalf Center for Science and Engineering, Boston University, Boston, Massachusetts 02215, USA
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32
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Li Z, Korobkova E, Werner K, Shum L, Mullin AS. State-resolved collisional quenching of vibrationally excited pyrazine (E(vib) = 37,900 cm(-1)) by D35Cl(v = 0). J Chem Phys 2005; 123:174306. [PMID: 16375527 DOI: 10.1063/1.2098647] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Supercollision relaxation of highly vibrationally excited pyrazine (E(vib) = 37,900 cm(-1)) with D35Cl is investigated using high-resolution transient IR diode laser absorption spectroscopy at 4.4 microm. Highly excited pyrazine is prepared by pulsed UV excitation at 266 nm, followed by rapid radiationless decay to the ground electronic state. The rotational energy distribution of the scattered DCl (v = 0,J) molecules with J = 15-21 is characterized by T(rot) = 755+/-90 K. The relative translational energy increases as a function of rotational quantum number for DCl with T(rel) = 710+/-190 K for J = 15 and T(rel) = 1270+/-240 K for J = 21. The average change in recoil velocity correlates with the change in rotational angular momentum quantum number and highlights the role of angular momentum in energy gain partitioning. The integrated energy-transfer rate for appearance of DCl (v = 0,J = 15-21) is k(2)(int) = 7.1x10(-11) cm3 molecule(-1) s(-1), approximately one-eighth the Lennard-Jones collision rate. The results are compared to earlier energy gain measurements of CO2 and H2O.
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Affiliation(s)
- Ziman Li
- Department of Chemistry, Boston University, Boston, Massachusetts 02215, USA
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33
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Li Z, Sansom R, Bonella S, Coker DF, Mullin AS. Trajectory Study of Supercollision Relaxation in Highly Vibrationally Excited Pyrazine and CO2. J Phys Chem A 2005; 109:7657-66. [PMID: 16834139 DOI: 10.1021/jp0525336] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Classical trajectory calculations were performed to simulate state-resolved energy transfer experiments of highly vibrationally excited pyrazine (E(vib) = 37,900 cm(-1)) and CO(2), which were conducted using a high-resolution transient infrared absorption spectrometer. The goal here is to use classical trajectories to simulate the supercollision energy transfer pathway wherein large amounts of energy are transferred in single collisions in order to compare with experimental results. In the trajectory calculations, Newton's laws of motion are used for the molecular motion, isolated molecules are treated as collections of harmonic oscillators, and intermolecular potentials are formed by pairwise Lennard-Jones potentials. The calculations qualitatively reproduce the observed energy partitioning in the scattered CO(2) molecules and show that the relative partitioning between bath rotation and translation is dependent on the moment of inertia of the bath molecule. The simulations show that the low-frequency modes of the vibrationally excited pyrazine contribute most to the strong collisions. The majority of collisions lead to small DeltaE values and primarily involve single encounters between the energy donor and acceptor. The large DeltaE exchanges result from both single impulsive encounters and chattering collisions that involve multiple encounters.
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Affiliation(s)
- Ziman Li
- Department of Chemistry, Boston University, Boston, Massachusetts 02215, USA
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34
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Elioff MS, Fang M, Mullin AS. Erratum: “Methylation effects in state resolved quenching of highly vibrationally excited azabenzenes (Evib∼38 500 cm−1). I. Collisions with water” [J. Chem. Phys. 115, 6990 (2001)]. J Chem Phys 2002. [DOI: 10.1063/1.1506309] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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35
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Park J, Shum L, Lemoff AS, Werner K, Mullin AS. Methylation effects in state-resolved quenching of highly vibrationally excited azabenzenes (Evib∼38 500 cm−1). II. Collisions with carbon dioxide. J Chem Phys 2002. [DOI: 10.1063/1.1499720] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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36
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Szaflarski DM, Mullin AS, Yokoyama K, Ashford MNR, Lineberger WC. Characterization of triplet states in doubly charged positive ions: assignment of the 3.PI.g-3.SIGMA.u+ electronic transition in nitrogen (N22+). ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100159a009] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Bernasconi CF, Kliner DAV, Mullin AS, Ni JX. Kinetics of ionization of nitromethane and phenylnitromethane by amines and carboxylate ions in Me2SO-water mixtures. Evidence of ammonium ion-nitronate ion hydrogen bonded complex formation in Me2SO-rich solvent mixtures. J Org Chem 2002. [DOI: 10.1021/jo00249a040] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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39
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Park J, Li Z, Lemoff AS, Rossi C, Elioff MS, Mullin AS. Energy-Dependent Quantum-State-Resolved Relaxation of Highly Vibrationally Excited Pyridine (Evib = 36 990−40 200 cm-1) through Collisions with CO2. J Phys Chem A 2002. [DOI: 10.1021/jp012270p] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jeunghee Park
- Department of Chemistry, Arthur G. B. Metcalf Center for Science and Engineering, Boston University, Boston, Massachusetts 02215
| | - Ziman Li
- Department of Chemistry, Arthur G. B. Metcalf Center for Science and Engineering, Boston University, Boston, Massachusetts 02215
| | - Andrew S. Lemoff
- Department of Chemistry, Arthur G. B. Metcalf Center for Science and Engineering, Boston University, Boston, Massachusetts 02215
| | - Craig Rossi
- Department of Chemistry, Arthur G. B. Metcalf Center for Science and Engineering, Boston University, Boston, Massachusetts 02215
| | - Michael S. Elioff
- Department of Chemistry, Arthur G. B. Metcalf Center for Science and Engineering, Boston University, Boston, Massachusetts 02215
| | - Amy S. Mullin
- Department of Chemistry, Arthur G. B. Metcalf Center for Science and Engineering, Boston University, Boston, Massachusetts 02215
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40
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Elioff MS, Fang M, Mullin AS. Methylation effects in state resolved quenching of highly vibrationally excited azabenzenes (Evib∼38 500 cm−1). I. Collisions with water. J Chem Phys 2001. [DOI: 10.1063/1.1400782] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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41
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Elioff MS, Sansom RL, Mullin AS. Vibrational Energy Gain in the ν2 Bending Mode of Water via Collisions with Hot Pyrazine (Evib = 37900 cm-1): Insights into the Dynamics of Energy Flow. J Phys Chem A 2000. [DOI: 10.1021/jp001425a] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Michael S. Elioff
- Department of Chemistry, Arthur G. B. Metcalf Center for Science and Engineering, Boston University, Boston, Massachusetts 02215
| | - Rebecca L. Sansom
- Department of Chemistry, Arthur G. B. Metcalf Center for Science and Engineering, Boston University, Boston, Massachusetts 02215
| | - Amy S. Mullin
- Department of Chemistry, Arthur G. B. Metcalf Center for Science and Engineering, Boston University, Boston, Massachusetts 02215
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42
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Wall MC, Lemoff AE, Mullin AS. Unraveling the energy dependence in large ΔE (V→RT) energy transfer: Separation of ΔE and probability in the collisional relaxation of highly vibrationally excited pyrazine (Evib=36 000 to 41 000 cm−1) by CO2. J Chem Phys 1999. [DOI: 10.1063/1.480060] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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43
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Elioff MS, Fraelich M, Sansom RL, Mullin AS. State-resolved collisional quenching of highly vibrationally excited pyridine by water: The role of strong electrostatic attraction in V→RT energy transfer. J Chem Phys 1999. [DOI: 10.1063/1.479635] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
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44
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Elioff MS, Wall MC, Lemoff AS, Mullin AS. Observation of an energy threshold for large ΔE collisional relaxation of highly vibrationally excited pyrazine (Evib=31 000–41 000 cm−1) by CO2. J Chem Phys 1999. [DOI: 10.1063/1.478456] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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45
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Fraelich M, Elioff MS, Mullin AS. State-Resolved Studies of Collisional Quenching of Highly Vibrationally Excited Pyrazine by Water: The Case of the Missing V → RT Supercollision Channel. J Phys Chem A 1998. [DOI: 10.1021/jp982608o] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Margaret Fraelich
- Department of Chemistry, Metcalf Center for Science and Engineering, Boston University, Boston, Massachusetts 02215
| | - Michael S. Elioff
- Department of Chemistry, Metcalf Center for Science and Engineering, Boston University, Boston, Massachusetts 02215
| | - Amy S. Mullin
- Department of Chemistry, Metcalf Center for Science and Engineering, Boston University, Boston, Massachusetts 02215
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46
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Wall MC, Lemoff AS, Mullin AS. Independent Determination of Supercollision Energy Loss Magnitudes and Rates in Highly Vibrationally Excited Pyrazine with Evib = 36000−41000 cm-1. J Phys Chem A 1998. [DOI: 10.1021/jp9819801] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mark C. Wall
- Department of Chemistry, Metcalf Center for Science and Engineering, Boston University, Boston, Massachusetts 02215
| | - Andrew S. Lemoff
- Department of Chemistry, Metcalf Center for Science and Engineering, Boston University, Boston, Massachusetts 02215
| | - Amy S. Mullin
- Department of Chemistry, Metcalf Center for Science and Engineering, Boston University, Boston, Massachusetts 02215
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47
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Wall MC, Mullin AS. “Supercollision” energy dependence: State-resolved energy transfer in collisions between highly vibrationally excited pyrazine (Evib=37 900 cm−1 and 40 900 cm−1) and CO2. J Chem Phys 1998. [DOI: 10.1063/1.476458] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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48
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Wall MC, Stewart BA, Mullin AS. State-resolved collisional relaxation of highly vibrationally excited pyridine by CO2: Influence of a permanent dipole moment. J Chem Phys 1998. [DOI: 10.1063/1.476061] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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49
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Michaels CA, Mullin AS, Park J, Chou JZ, Flynn GW. The collisional deactivation of highly vibrationally excited pyrazine by a bath of carbon dioxide: Excitation of the infrared inactive (1000), (0200), and (0220) bath vibrational modes. J Chem Phys 1998. [DOI: 10.1063/1.475666] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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50
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Affiliation(s)
- Amy S. Mullin
- Department of Chemistry, Boston University, Boston, MA 02146
| | - George C. Schatz
- Department of Chemistry, Northwestern University, Evanston, IL 60208-3113
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