1
|
Owschimikow N, Königsmann F, Maurer J, Giese P, Ott A, Schmidt B, Schwentner N. Cross sections for rotational decoherence of perturbed nitrogen measured via decay of laser-induced alignment. J Chem Phys 2010; 133:044311. [DOI: 10.1063/1.3464487] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
|
2
|
Hellmann R, Bich E, Vogel E, Dickinson AS, Vesovic V. Calculation of the transport and relaxation properties of methane. II. Thermal conductivity, thermomagnetic effects, volume viscosity, and nuclear-spin relaxation. J Chem Phys 2009; 130:124309. [PMID: 19334832 DOI: 10.1063/1.3098317] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Transport properties of pure methane have been calculated in the rigid-rotor approximation using the recently proposed intermolecular potential energy hypersurface [R. Hellmann et al., J. Chem. Phys. 128, 214303 (2008)] and the classical-trajectory method. Results are reported in the dilute-gas limit for the temperature range of 80-1500 K. The calculated thermal conductivity values are in very good agreement with the measured data and correlations. In the temperature range of 310-480 K the calculated values underestimate the best experimental data by 0.5%-1.0%. We suggest that the calculated values are more accurate, especially at low and high temperatures, than the currently available correlations based on the experimental data. Our results also agree well with measurements of thermal transpiration and of the thermomagnetic coefficients. We have shown that although the dominant contribution to the thermomagnetic coefficients comes from the Wjj polarization in the spherical approximation, the contribution of a second polarization, Wj, cannot be neglected nor can a full description of the Wjj polarization. The majority of the volume viscosity measurements around room temperature are consistent with the calculated values but this is not the case at high and low temperatures. However, for nuclear-spin relaxation the calculated values consistently exceed the measurements, which are mutually consistent within a few percent.
Collapse
Affiliation(s)
- Robert Hellmann
- Institut für Chemie, Universität Rostock, D-18059 Rostock, Germany
| | | | | | | | | |
Collapse
|
3
|
Amaral GA, Aoiz FJ, Bañares L, Barr J, Herrero VJ, Martínez-Haya B, Menéndez M, Pino GA, Tanarro I, Torres I, Verdasco JE. Low-Temperature Rotational Relaxation of CO in Self-Collisions and in Collisions with Ne and He. J Phys Chem A 2005; 109:9402-13. [PMID: 16866388 DOI: 10.1021/jp051766u] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The low-temperature rotational relaxation of CO in self-collisions and in collisions with the rare-gas atoms Ne and He has been investigated in supersonic expansions with a combination of resonance-enhanced multiphoton ionization (REMPI) spectroscopy and time-of-flight techniques. For the REMPI detection of CO, a novel 2 + 1' scheme has been employed through the A(1)Pi state of CO. From the measured data, average cross sections for rotational relaxation have been derived as a function of temperature in the range 5-100 K. For CO-Ne and CO-He, the relaxation cross sections grow, respectively, from values of approximately 20 and 7 A(2) at 100 K to values of approximately 65-70 and approximately 20 A(2) in the 5-20 K temperature range. The cross section for the relaxation of CO-CO grows from a value close to 40 A(2) at 100 K to a maximum of 60 A(2) at 20 K and then decreases again to 40 A(2) at 5 K. These results are qualitatively similar to those obtained previously with the same technique for N(2)-N(2), N(2)-Ne, and N(2)-He collisions, although in the low-temperature range (T < 20 K) the CO relaxation cross sections are significantly larger than those for N(2). Some discrepancies have been found between the present relaxation cross sections for CO-CO and CO-He and the values derived from electron-induced fluorescence experiments.
Collapse
Affiliation(s)
- G A Amaral
- Departamento de Química Física, Facultad de Química, Universidad Complutense de Madrid, E-28040 Madrid, Spain
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
4
|
Paci P, Zvinevich Y, Tanimura S, Wyslouzil BE, Zahniser M, Shorter J, Nelson D, McManus B. Spatially resolved gas phase composition measurements in supersonic flows using tunable diode laser absorption spectroscopy. J Chem Phys 2004; 121:9964-70. [PMID: 15549871 DOI: 10.1063/1.1807377] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
We used a tunable diode laser absorption spectrometer to follow the condensation of D(2)O in a supersonic Laval nozzle. We measured both the concentration of the condensible vapor and the spectroscopic temperature as a function of position and compared the results to those inferred from static pressure measurements. Upstream and in the early stages of condensation, the quantitative agreement between the different experimental techniques is good. Far downstream, the spectroscopic results predict a lower gas phase concentration, a higher condensate mass fraction, and a higher temperature than the pressure measurements. The difference between the two measurement techniques is consistent with a slight compression of the boundary layers along the nozzle walls during condensation.
Collapse
Affiliation(s)
- Paolo Paci
- Department of Chemical Engineering, Worcester Polytechnic Institute, Worcester, Massachusetts 01609-2280, USA
| | | | | | | | | | | | | | | |
Collapse
|
5
|
Maté B, Thibault F, Ramos A, Tejeda G, Fernández JM, Montero S. Experimental and theoretical determination of rotational-translational state-to-state rate constants for N2:He collisions at low temperature (3 J Chem Phys 2003. [DOI: 10.1063/1.1543945] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
|
6
|
Aoiz F, Bañares L, Herrero V, Martı́nez-Haya B, Menéndez M, Quintana P, Tanarro I, Verdasco E. Low temperature rotational relaxation of N2 in collisions with He. Chem Phys Lett 2003. [DOI: 10.1016/s0009-2614(02)01761-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
7
|
Aoiz FJ, Bañares L, Herrero VJ, Martínez-Haya B, Menéndez M, Quintana P, Tanarro I, Verdasco E. Low-Temperature Rotational Relaxation of N2 in Collisions with Ne. J Phys Chem A 2001. [DOI: 10.1021/jp010845c] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- F. J. Aoiz
- Departamento de Química Física and CAI de espectroscopía, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain, Instituto de Estructura de la Materia (CSIC), Serrano 123, E-28006 Madrid, Spain, and Departamento de Ciencias Ambientales, Universidad Pablo de Olavide, E-41013 Sevilla, Spain
| | - L. Bañares
- Departamento de Química Física and CAI de espectroscopía, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain, Instituto de Estructura de la Materia (CSIC), Serrano 123, E-28006 Madrid, Spain, and Departamento de Ciencias Ambientales, Universidad Pablo de Olavide, E-41013 Sevilla, Spain
| | - V. J. Herrero
- Departamento de Química Física and CAI de espectroscopía, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain, Instituto de Estructura de la Materia (CSIC), Serrano 123, E-28006 Madrid, Spain, and Departamento de Ciencias Ambientales, Universidad Pablo de Olavide, E-41013 Sevilla, Spain
| | - B. Martínez-Haya
- Departamento de Química Física and CAI de espectroscopía, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain, Instituto de Estructura de la Materia (CSIC), Serrano 123, E-28006 Madrid, Spain, and Departamento de Ciencias Ambientales, Universidad Pablo de Olavide, E-41013 Sevilla, Spain
| | - M. Menéndez
- Departamento de Química Física and CAI de espectroscopía, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain, Instituto de Estructura de la Materia (CSIC), Serrano 123, E-28006 Madrid, Spain, and Departamento de Ciencias Ambientales, Universidad Pablo de Olavide, E-41013 Sevilla, Spain
| | - P. Quintana
- Departamento de Química Física and CAI de espectroscopía, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain, Instituto de Estructura de la Materia (CSIC), Serrano 123, E-28006 Madrid, Spain, and Departamento de Ciencias Ambientales, Universidad Pablo de Olavide, E-41013 Sevilla, Spain
| | - I. Tanarro
- Departamento de Química Física and CAI de espectroscopía, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain, Instituto de Estructura de la Materia (CSIC), Serrano 123, E-28006 Madrid, Spain, and Departamento de Ciencias Ambientales, Universidad Pablo de Olavide, E-41013 Sevilla, Spain
| | - E. Verdasco
- Departamento de Química Física and CAI de espectroscopía, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain, Instituto de Estructura de la Materia (CSIC), Serrano 123, E-28006 Madrid, Spain, and Departamento de Ciencias Ambientales, Universidad Pablo de Olavide, E-41013 Sevilla, Spain
| |
Collapse
|
8
|
Maris A, Favero LB, Danieli R, Favero PG, Caminati W. Vibrational relaxation in pyridine upon supersonic expansion. J Chem Phys 2000. [DOI: 10.1063/1.1318224] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
|
9
|
Aoiz FJ, Díez-Rojo T, Herrero VJ, Martínez-Haya B, Menéndez M, Quintana P, Ramonat L, Tanarro I, Verdasco E. Low-Temperature Rotational Relaxation of N2 Studied with Resonance-Enhanced Multiphoton Ionization. J Phys Chem A 1999. [DOI: 10.1021/jp983850y] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- F. J. Aoiz
- Departamento de Química Física, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain, and Instituto de Estructura de la Materia (CSIC), Serrano 113, E-28006 Madrid, Spain
| | - T. Díez-Rojo
- Departamento de Química Física, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain, and Instituto de Estructura de la Materia (CSIC), Serrano 113, E-28006 Madrid, Spain
| | - V. J. Herrero
- Departamento de Química Física, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain, and Instituto de Estructura de la Materia (CSIC), Serrano 113, E-28006 Madrid, Spain
| | - B. Martínez-Haya
- Departamento de Química Física, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain, and Instituto de Estructura de la Materia (CSIC), Serrano 113, E-28006 Madrid, Spain
| | - M. Menéndez
- Departamento de Química Física, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain, and Instituto de Estructura de la Materia (CSIC), Serrano 113, E-28006 Madrid, Spain
| | - P. Quintana
- Departamento de Química Física, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain, and Instituto de Estructura de la Materia (CSIC), Serrano 113, E-28006 Madrid, Spain
| | - L. Ramonat
- Departamento de Química Física, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain, and Instituto de Estructura de la Materia (CSIC), Serrano 113, E-28006 Madrid, Spain
| | - I. Tanarro
- Departamento de Química Física, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain, and Instituto de Estructura de la Materia (CSIC), Serrano 113, E-28006 Madrid, Spain
| | - E. Verdasco
- Departamento de Química Física, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain, and Instituto de Estructura de la Materia (CSIC), Serrano 113, E-28006 Madrid, Spain
| |
Collapse
|
10
|
Ahern MM, Steinhurst DA, Smith MA. Rotational relaxation of CO in He, Ar, N2 and CO free jets. Chem Phys Lett 1999. [DOI: 10.1016/s0009-2614(98)01448-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
11
|
Kudoh S, Takayanagi M, Nakata M. Conformational cooling in a supersonic jet of 1,2-dichloroethane studied by matrix isolation infrared spectroscopy. Chem Phys Lett 1998. [DOI: 10.1016/s0009-2614(98)01066-5] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|