Collisional Broadening Coefficients in the ν4 Band of NH3 Perturbed by He and Ar

2000 ◽  
Vol 202 (1) ◽  
pp. 83-88 ◽  
Author(s):  
M. Dhib ◽  
J.-P. Bouanich ◽  
H. Aroui ◽  
M. Broquier
Keyword(s):  
Collisional Broadening

scholarly journals Ultraviolet spectroscopy of pressurized and supercritical carbon dioxide

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Timothy W. Marin ◽  
Ireneusz Janik
Keyword(s):  
Carbon Dioxide ◽  
Potential Energy Surfaces ◽  
Vacuum Ultraviolet ◽  
Electronic Absorption Spectra ◽  
Industrial Applications ◽  
Ultraviolet Spectroscopy ◽  
Collisional Broadening ◽  
Thermodynamic Critical Point ◽  
State Potential ◽  
Energy Surfaces

AbstractCarbon dioxide (CO2) is prevalent in planetary atmospheres and sees use in a variety of industrial applications. Despite its ubiquitous nature, its photochemistry remains poorly understood. In this work we explore the density dependence of pressurized and supercritical CO2 electronic absorption spectra by vacuum ultraviolet spectroscopy over the wavelength range 1455-2000 Å. We show that the lowest absorption band transition energy is unaffected by a density increase up to and beyond the thermodynamic critical point (137 bar, 308 K). However, the diffuse vibrational structure inherent to the spectrum gradually decreases in magnitude. This effect cannot be explained solely by collisional broadening and/or dimerization. We suggest that at high densities close proximity of neighboring CO2 molecules with a variety of orientations perturbs the multiple monomer electronic state potential energy surfaces, facilitating coupling between binding and dissociative states. We estimate a critical radius of ~4.1 Å necessary to cause such perturbations.

Collisional broadening of Rydberg states by alkali-metal perturbers

1991 ◽  
Vol 44 (9) ◽  
pp. 5725-5729 ◽  
Author(s):  
V. M. Borodin ◽  
I. I. Fabrikant ◽  
A. K. Kazansky
Keyword(s):  
Alkali Metal ◽  
Rydberg States ◽  
Collisional Broadening

CARS investigation of collisional broadening of the hydrogen Q-branch transitions by water at high temperatures

2007 ◽  
Author(s):  
K. A. Vereschagin ◽  
A. K. Vereschagin ◽  
V. V. Smirnov ◽  
O. M. Stel'makh ◽  
V. I. Fabelinsky ◽  
...  
Keyword(s):  
High Temperatures ◽  
Collisional Broadening

scholarly journals Non-perturbative determination of collisional broadening and medium induced radiation in QCD plasmas

2021 ◽  
Vol 2021 (10) ◽  
Author(s):  
Guy D. Moore ◽  
Sören Schlichting ◽  
Niels Schlusser ◽  
Ismail Soudi
Keyword(s):  
Large Impact ◽  
Limiting Behavior ◽  
Collisional Broadening ◽  
Impact Parameters

Abstract We supply recently obtained results from lattice EQCD with the correct UV limit to construct the collisional broadening kernel C(b⊥) in a QCD plasma. We discuss the limiting behavior of C(b⊥) at small and large impact parameters b⊥, and illustrate how the results can be used to compute medium-induced radiation rates.

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