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Srishailam K, Ravindranath L, Venkatram Reddy B, Ramana Rao G. Electronic Spectra (Experimental and Simulated), and DFT Investigation of NLO, FMO, NBO, and MESP Characteristics of Some Biphenylcarboxaldehydes. Polycycl Aromat Compd 2022. [DOI: 10.1080/10406638.2022.2130376] [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: 10/17/2022]
Affiliation(s)
- K. Srishailam
- Department of Physics, SR University Warangal, Warangal, India
- Department of Physics, Kakatiya University, Warangal, India
| | - L. Ravindranath
- Department of Physics, Kakatiya University, Warangal, India
- Department of Physics, Malla Reddy Engineering College, Hyderabad, India
| | | | - G. Ramana Rao
- Department of Physics, Kakatiya University, Warangal, India
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Sreenivas B, Ravindranath L, Srishailam K, Ojha JK, Venkatram Reddy B. Experimental and density functional theory study on structure, vibrational and molecular characteristics of 2-chloro-5-methylpyrimidine and 2,4-dichloro-5-methylpyrimidine. Molecular Simulation 2022. [DOI: 10.1080/08927022.2022.2060967] [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] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- B. Sreenivas
- Department of Physics, Kakatiya University, Warangal, India
| | | | - K. Srishailam
- Department of Physics, Kakatiya University, Warangal, India
- Department of Physics, SR University, Warangal, India
| | - Jai Kishan Ojha
- Department of Physics, Government Degree College, Mancherial, India
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Franke PR, Moore KB, Schaefer HF, Douberly GE. tert-Butyl peroxy radical: ground and first excited state energetics and fundamental frequencies. Phys Chem Chem Phys 2019; 21:9747-9758. [DOI: 10.1039/c9cp01476d] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [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 lowest adiabatic electronic transition origin and fundamental vibrational frequencies are computed, with high accuracy, for the tert-butyl peroxy radical.
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Affiliation(s)
| | - Kevin B. Moore
- Department of Chemistry
- University of Georgia
- Athens
- USA
- Center for Computational Quantum Chemistry
| | - Henry F. Schaefer
- Department of Chemistry
- University of Georgia
- Athens
- USA
- Center for Computational Quantum Chemistry
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Launder AM, Turney JM, Agarwal J, Schaefer HF. Ethylperoxy radical: approaching spectroscopic accuracy via coupled-cluster theory. Phys Chem Chem Phys 2017; 19:15715-15723. [DOI: 10.1039/c7cp02795h] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [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
Highly reliable ground and excited state properties of the conformers of ethylperoxy radical are predicted using coupled-cluster theory. This research has implications for future characterization of intermediates in tropospheric and low-temperature combustion processes.
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Affiliation(s)
- Andrew M. Launder
- Center for Computational Quantum Chemistry
- University of Georgia
- Athens
- USA
| | - Justin M. Turney
- Center for Computational Quantum Chemistry
- University of Georgia
- Athens
- USA
| | - Jay Agarwal
- Center for Computational Quantum Chemistry
- University of Georgia
- Athens
- USA
| | - Henry F. Schaefer
- Center for Computational Quantum Chemistry
- University of Georgia
- Athens
- USA
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Affiliation(s)
- Manuvesh Sangwan
- Department of Chemistry
and Environmental Science, New Jersey Institute of Technology, University Heights,
Newark, New Jersey 07102, United States
| | - Lev N. Krasnoperov
- Department of Chemistry
and Environmental Science, New Jersey Institute of Technology, University Heights,
Newark, New Jersey 07102, United States
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Abstract
The photolysis of chlorine peroxide (ClOOCl) is understood to be a key step in the destruction of polar stratospheric ozone. This study generated and purified ClOOCl in a novel fashion, which resulted in spectra with low impurity levels and high peak absorbances. The ClOOCl was generated by laser photolysis of Cl2 in the presence of ozone, or by photolysis of ozone in the presence of CF2Cl2. The product ClOOCl was collected, along with small amounts of impurities, in a trap at about -125 degrees C. Gas-phase ultraviolet spectra were recorded using a long path cell and spectrograph/diode array detector as the trap was slowly warmed. The spectrum of ClOOCl could be fit with two Gaussian-like expressions, corresponding to two different electronic transitions, having similar energies but different widths. The energies and band strengths of these two transitions compare favorably with previous ab initio calculations. The cross sections of ClOOCl at wavelengths longer than 300 nm are significantly lower than all previous measurements or estimates. These low cross sections in the photolytically active region of the solar spectrum result in a rate of photolysis of ClOOCl in the stratosphere that is much lower than currently recommended. For conditions representative of the polar vortex (solar zenith angle of 86 degrees, 20 km altitude, and O3 and temperature profiles measured in March 2000) calculated photolysis rates are a factor of 6 lower than the current JPL/NASA recommendation. This large discrepancy calls into question the completeness of present atmospheric models of polar ozone depletion.
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Affiliation(s)
- Francis D Pope
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA
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Dillon TJ, Tucceri ME, Crowley JN. Laser induced fluorescence studies of iodine oxide chemistry : Part II. The reactions of IO with CH3O2, CF3O2 and O3. Phys Chem Chem Phys 2006; 8:5185-98. [PMID: 17203143 DOI: 10.1039/b611116e] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The technique of pulsed laser photolysis was coupled to laser induced fluorescence detection of iodine oxide (IO) to measure rate coefficients, k for the reactions IO + CH(3)O(2)--> products (R1, 30-318 Torr N(2)), IO + CF(3)O(2)--> products (R2, 70-80 Torr N(2)), and IO + O(3)--> OIO + O(2) (R3a). Values of k(1) = (2 +/- 1) x 10(-12) cm(3) molecule(-1) s(-1), k(2) = (3.6 +/- 0.8) x 10(-11) cm(3) molecule(-1) s(-1), and k(3a) <5 x 10(-16) cm(3) molecule(-1) s(-1) were obtained at T = 298 K. In the course of this work, the product yield of IO from the reaction of CH(3)O(2) with I was determined to be close to zero, whereas CH(3)OOI was formed efficiently at 70 Torr N(2). Similarly, no evidence was found for IO formation in the CF(3)O(2) + I reaction. An estimate of the rate coefficients k(CH(3)O(2) + I) = 2 x 10(-11) cm(3) molecule(-1) s(-1) and k(CH(3)OOI + I) = 1.5 x 10(-10) cm(3) molecule(-1) s(-1) was also obtained. The results on k(1)-k(3) are compared to the limited number of previous investigations and the implications for the chemistry of the marine boundary layer are briefly discussed.
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Affiliation(s)
- Terry J Dillon
- Max-Planck-Institut für Chemie, Division of Atmospheric Chemistry, 55020 Mainz, Germany.
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Gray RI, Luckett KM, Tellinghuisen J. Component Analysis of the Visible Absorption Spectra of I2 and Br2 in Inert Solvents: A Critique of Band Decomposition by Least-Squares Fitting. J Phys Chem A 2001. [DOI: 10.1021/jp012618g] [Citation(s) in RCA: 21] [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: 11/30/2022]
Affiliation(s)
- Richard Ian Gray
- Department of Chemistry, Vanderbilt University, Nashville, Tennessee 37235
| | - Keith M. Luckett
- Department of Chemistry, Vanderbilt University, Nashville, Tennessee 37235
| | - Joel Tellinghuisen
- Department of Chemistry, Vanderbilt University, Nashville, Tennessee 37235
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Tyndall GS, Cox RA, Granier C, Lesclaux R, Moortgat GK, Pilling MJ, Ravishankara AR, Wallington TJ. Atmospheric chemistry of small organic peroxy radicals. ACTA ACUST UNITED AC 2001. [DOI: 10.1029/2000jd900746] [Citation(s) in RCA: 287] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Bauer D, Ingham T, Carl SA, Moortgat GK, Crowley JN. Ultraviolet−Visible Absorption Cross Sections of Gaseous HOI and Its Photolysis at 355 nm. J Phys Chem A 1998. [DOI: 10.1021/jp9804300] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Dieter Bauer
- Max-Planck-Institut für Chemie, Division of Atmospheric Chemistry, Postfach 3060, 55020 Mainz, Germany
| | - Trevor Ingham
- Max-Planck-Institut für Chemie, Division of Atmospheric Chemistry, Postfach 3060, 55020 Mainz, Germany
| | - Shaun A. Carl
- Max-Planck-Institut für Chemie, Division of Atmospheric Chemistry, Postfach 3060, 55020 Mainz, Germany
| | - Geert K. Moortgat
- Max-Planck-Institut für Chemie, Division of Atmospheric Chemistry, Postfach 3060, 55020 Mainz, Germany
| | - John N. Crowley
- Max-Planck-Institut für Chemie, Division of Atmospheric Chemistry, Postfach 3060, 55020 Mainz, Germany
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