Chattering collisions and their effects on gas phase rotational energy relaxation cross sections

1990 ◽  
Vol 93 (12) ◽  
pp. 8816-8820 ◽  
Author(s):  
David R. Evans ◽  
Glenn T. Evans ◽  
David K. Hoffman
Keyword(s):  
Gas Phase ◽  
Cross Sections ◽  
Energy Relaxation ◽  
Rotational Energy

scholarly journals Effects of Rotational Energy Relaxation in a Modular Particle-Continuum Method

2011 ◽  
Vol 25 (2) ◽  
pp. 218-227 ◽  
Author(s):  
Timothy R. Deschenes ◽  
Timothy D. Holman ◽  
Iain D. Boyd
Keyword(s):  
Energy Relaxation ◽  
Rotational Energy

Absolute photodissociation cross sections of gas phase sodium chloride at room temperature

1986 ◽  
Vol 84 (8) ◽  
pp. 4378-4384 ◽  
Author(s):  
J. A. Silver ◽  
D. R. Worsnop ◽  
A. Freedman ◽  
C. E. Kolb
Keyword(s):  
Sodium Chloride ◽  
Gas Phase ◽  
Cross Sections ◽  
Room Temperature

Mass Spectrometric Studies of Physical, Thermochemical and Reactive Properties of Xenon Fluorides, Xenon Oxides and Xenon Oxyfluorides

2002 ◽  
Vol 8 (3) ◽  
pp. 233-246 ◽  
Author(s):  
Vladislav V. Zelenov ◽  
Elena V. Aparina ◽  
Alexander V. Loboda ◽  
Alexander S. Kukui ◽  
Alexander F. Dodonov ◽  
...  
Keyword(s):  
Gas Phase ◽  
Electron Impact ◽  
Cross Sections ◽  
Impact Ionization ◽  
Saturated Vapor ◽  
Electron Impact Ionization ◽  
Binding Energies ◽  
Ionization Mass ◽  
Vapor Pressures ◽  
Gas Phase Reactions

Using a reactor with a flowing diffusion cloud coupled to a high-resolution, low-energy electron-impact ionization mass spectrometer, mechanistic, kinetic and thermochemical characteristics of gas-phase reactions with the participation of charged and neutral xenon oxides, xenon fluorides and xenon oxyfluorides have been investigated. Ionization energies for XeF, XeF2, XeF4, XeO3, XeO4, XeOF4 molecules and appearance energies for the ions formed from these molecules were obtained. Based on experimental and reference data, the enthalpies of XeO3 and XeOF4 formation were refined and a number of binding energies in the parent and fragment ions were calculated. For electron-impact ionization, the ionization cross-sections for Xe, XeF2, XeF4 and XeOF4 proved to correlate with a semi-empirical principle of full ionization. Based on the temperature dependencies of saturated vapor pressures for XeO4, XeOF4 and XeO2F2, their enthalpies of evaporation, sublimation and melting were determined. The mechanisms of gas-phase reactions between H atoms and neutral XeF2, XeF4, XeF6, XeO4 and XeOF4 were studied.

scholarly journals Electron-Induced Chemistry in the Condensed Phase

Atoms ◽  
2019 ◽  
Vol 7 (1) ◽  
pp. 33
Author(s):  
Jan Hendrik Bredehöft
Keyword(s):  
Gas Phase ◽  
Cross Sections ◽  
Condensed Phase ◽  
Theoretical Understanding ◽  
The Past ◽  
Long Time ◽  
The Difference ◽  
Molecule Interactions ◽  
Multi Body ◽  
Molecule Interaction

Electron–molecule interactions have been studied for a long time. Most of these studies have in the past been limited to the gas phase. In the condensed-phase processes that have recently attracted attention from academia as well as industry, a theoretical understanding is mostly based on electron–molecule interaction data from these gas phase experiments. When transferring this knowledge to condensed-phase problems, where number densities are much higher and multi-body interactions are common, care must be taken to critically interpret data, in the light of this chemical environment. The paper presented here highlights three typical challenges, namely the shift of ionization energies, the difference in absolute cross-sections and branching ratios, and the occurrence of multi-body processes that can stabilize otherwise unstable intermediates. Examples from recent research in astrochemistry, where radiation driven chemistry is imminently important are used to illustrate these challenges.

Temperature dependence of cross sections for 72P1/2 ↔ 72P3/2 excitation transfer and for quenching in cesium, induced in collisions with H2, N2, CH4, and CD4

1982 ◽  
Vol 60 (2) ◽  
pp. 239-244 ◽  
Author(s):  
I. N. Siara ◽  
R. U. Dubois ◽  
L. Krause
Keyword(s):  
Energy Transfer ◽  
Temperature Dependence ◽  
Cross Sections ◽  
Rotational Energy ◽  
Excitation Transfer ◽  
Sensitized Fluorescence ◽  
Temperature Range ◽  
Rotational Energy Transfer ◽  
Order Of Magnitude

The temperature dependence of cross sections for 72P1/2 ↔ 72P3/2 excitation transfer in cesium, as well as the effective quenching of these states, induced in collisions with H2, N2, CH4, and CD4 molecules have been investigated in a series of sensitized fluorescence experiments over a temperature range 390–640 K. The 72P mixing cross sections are of the order of 10−15 cm2 and exceed by at least one order of magnitude similar cross sections for mixing by collisions with Ne, Ar, Kr, and Xe. The large sizes of the mixing cross sections and their variation with temperature are ascribed to a phenomenon of electronic-to-rotational energy transfer.

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