Journal ArticleDOI
Translational relaxation and electronic quenching of hot O(1D) by collisions with N2
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In this article, the translational relaxation and electronic quenching processes of translationally hot O(1D) atoms by collisions with N2 in a gas cell at room temperature are studied using a vacuum ultraviolet laser induced fluorescence technique.Abstract:
Translational relaxation and electronic quenching processes of translationally hot O(1D) atoms by collisions with N2 in a gas cell at room temperature are studied using a vacuum ultraviolet laser induced fluorescence technique. The initial hot O(1D) atoms which have translational energies of 18.2 and 9.8 kcal mol−1 are produced by the photodissociation of N2O at 193 nm and O2 at 157 nm, respectively. The translational relaxation processes are investigated by time resolved measurements of the Doppler profiles for the O(1D) atoms, while the quenching processes are studied by measuring both the decrease of the O(1D) concentration and the increase of the product O(3P) concentration after the photochemical formation of the hot O(1D) atoms. When the initial translational energy of O(1D) is 9.8 kcal mol−1, about 40% of the O(1D) atoms are electronically quenched before the entire thermalization of the hot O(1D) atoms takes place in a gaseous mixture with N2. This indicates that the translational relaxation rate ...read more
Citations
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The time-dependent quantum wave packet approach to the electronically nonadiabatic processes in chemical reactions
Tian-Shu Chu,Yan Zhang,Ke-Li Han +2 more
TL;DR: The time-dependent quantum wave packet approach has been improved and formulated to treat the multiple surface problems and thus provided a new simple, yet a clear quantum picture for interpreting the reaction mechanism underlying the nonadiabatic dynamical processes as discussed by the authors.
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Photolysis of atmospheric ozone in the ultraviolet region.
Yutaka Matsumi,Masahiro Kawasaki +1 more
TL;DR: The near-ultraviolet (UV) photochemistry of ozone remains a topic of great contemporary interest and research interests include chemical reaction processes in the atmosphere and development of instruments for atmospheric gases and particles.
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Hot oxygen and carbon escape from the martian atmosphere
TL;DR: In this article, the escape of hot O and C atoms from the present martian atmosphere during low and high solar activity conditions has been studied with a Monte-Carlo model, including the initial energy distribution of hot atoms, elastic, inelastic, and quenching collisions between the suprathermal atoms and the ambient cooler neutral atmosphere, and applies energy dependent total and differential cross sections for the determination of the collision probability and the scattering angles.
Journal ArticleDOI
Laser induced fluorescence studies of the reactions of O(1D2) with N2, O2, N2O, CH4, H2, CO2, Ar, Kr and n-C4H10
TL;DR: In this article, a laser flash photolysis-laser-induced fluorescence (LIF) technique has been used to study the kinetics of the reactions of electronically excited oxygen atoms, O(1D2), with N2, O2, N2O, CH4, H2, CO2, Ar, Kr and n-C4H10 over the temperature range 195-673 K.
Journal ArticleDOI
Intramolecular 15N and 18O fractionation in the reaction of N2O with O(1D) and its implications for the stratospheric N2O isotope signature
TL;DR: In this paper, the authors present results on the 18O and position-resolved 15N kinetic isotope effects in the reaction of nitrous oxide with O(1D) obtained by recently developed mass spectrometric techniques.
References
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Chemical kinetics and photochemical data for use in stratospheric modeling
W. B. Demore,J. J. Margitan,Mario J. Molina,R. T. Watson,D. M. Golden,R. F. Hampson,Michael J. Kurylo,Carleton J. Howard,A. R. Ravishankara +8 more
TL;DR: As part of a series of evaluated sets, rate constants and photochemical cross sections compiled by the NASA Panel for Data Evaluation are provided in this article, with particular emphasis on the ozone layer and its possible perturbation by anthropogenic and natural phenomena.
Chemical kinetics and photochemical data for use in stratospheric modeling
W. B. Demore,Stanley P. Sander,D. M. Golden,R. F. Hampson,Michael J. Kurylo,Carleton J. Howard,A. R. Ravishankara,C. E. Kolb,Mario J. Molina +8 more
TL;DR: As part of a series of evaluated sets, rate constants and photochemical cross sections compiled by the NASA Panel for Data Evaluation are provided in this paper, with particular emphasis on the ozone layer and its possible perturbation by anthropogenic and natural phenomena.
Journal ArticleDOI
Theoretical treatment of quenching in O(1D) + N2 collisions
TL;DR: In this paper, it was shown that the cross-section of a collision complex is ∼40 A2 at thermal energy, and a statistical model was used to determine the quenching probability of the collision complex.
Journal ArticleDOI
Temperature dependence of O(1D) rate constants for reactions with O2, N2, CO2, O3, and H2O
TL;DR: In this article, the absolute rate constants and their temperature dependencies for the deactivation of O(1D) by five important atmospheric gases are reported and compared with other energy dependent measurements and with the theories reported in the literature.