Rotational relaxation rates in HF and Ar–HF from the direct inversion of pressure broadened linewidths

1981 ◽  
Vol 75 (10) ◽  
pp. 4927-4933 ◽  
Author(s):  
Joseph J. BelBruno ◽  
Jack Gelfand ◽  
Herschel Rabitz
Keyword(s):  
Rotational Relaxation ◽  
Relaxation Rates ◽  
Direct Inversion

Line mixing and state-to-state rotational relaxation rates inD2determined from the RamanQbranch

1993 ◽  
Vol 48 (4) ◽  
pp. 3030-3035 ◽  
Author(s):  
P. M. Sinclair ◽  
J. W. Forsman ◽  
J. R. Drummond ◽  
A. D. May
Keyword(s):  
Rotational Relaxation ◽  
Relaxation Rates ◽  
Line Mixing

Two-dimensional infrared spectroscopy from the gas to liquid phase: density dependent J-scrambling, vibrational relaxation, and the onset of liquid character

2019 ◽  
Vol 21 (38) ◽  
pp. 21249-21261 ◽  
Author(s):  
Greg Ng Pack ◽  
Matthew C. Rotondaro ◽  
Parth P. Shah ◽  
Aritra Mandal ◽  
Shyamsunder Erramilli ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Liquid Phase ◽  
Supercritical Fluids ◽  
Vibrational Relaxation ◽  
Rotational Relaxation ◽  
Two Dimensional ◽  
Relaxation Rates ◽  
Phase Density ◽  
Density Dependent ◽  
Two Dimensional Infrared Spectroscopy

Ultrafast 2DIR reveals rotational relaxation rates, critical slowing effects, and co-existence of free rotor and liquid populations in supercritical fluids.

Semi-Classical Calculation of Rotational Relaxation Rates in Ozone

1993 ◽  
Vol 24 (4) ◽  
pp. 259-262 ◽  
Author(s):  
C Boursier ◽  
C Boulet ◽  
F Ménard-Bourcin ◽  
J.-M Flaud ◽  
C Camy-Peyret
Keyword(s):  
Rotational Relaxation ◽  
Relaxation Rates ◽  
Classical Calculation

The influence of rotational and vibrational energy relaxation on boundary-layer stability

1998 ◽  
Vol 372 ◽  
pp. 93-118 ◽  
Author(s):  
FABIO P. BERTOLOTTI
Keyword(s):  
Boundary Layer ◽  
Flat Plate ◽  
Bulk Viscosity ◽  
Vibrational Energy ◽  
Energy Relaxation ◽  
Rapid Expansion ◽  
Rotational Relaxation ◽  
Stagnation Temperature ◽  
Relaxation Rates ◽  
Vibrational Energy Relaxation

We investigate the influence of rotational and vibrational energy relaxation on the stability of laminar boundary layers in supersonic flows by numerically solving the linearized equations of motion for a flow in thermal non-equilibrium. We model air as a mixture of nitrogen, oxygen and carbon dioxide, and derive accurate models for the relaxation rates from published experimental data in the field of physical chemistry. The influence of rotational relaxation is to dampen high-frequency instabilities, consistent with the well known damping effect of rotational relaxation on acoustical waves. The influence of rotational relaxation can be modelled with acceptable accuracy through the use of the bulk-viscosity approximation when the bulk viscosity is computed with a formula described herein. Vibrational relaxation affects the growth of disturbances by changing the characteristics of the laminar mean flow. The influence is strongest when the flow field contains a region at, or near, stagnation conditions, followed by a rapid expansion, such as inside wind tunnels and around bodies with a blunt leading edge, whereby the rapid expansion causes the internal energy to freeze in a distribution out of equilibrium. For flows at Mach 4.5 and stagnation temperature of 1000 K, the total amplification exhibited by boundary-layer disturbances over a sharp flat plate in wind-tunnel flows can reach a value that is fifty times as high as the value computed under the assumption of thermal equilibrium. The difference in amplification can be twice as high in the case of a blunt flat plate at atmospheric flight conditions.

Rotational relaxation rates in CO-He mixtures

2001 ◽  
Vol 99 (7) ◽  
pp. 559-572 ◽  
Author(s):  
ANDREY E. BELIKOV ◽  
ALEXEY V. STOROZHEV ◽  
MIKHAIL L. STREKALOV ◽  
MARK A. SMITH
Keyword(s):  
Rotational Relaxation ◽  
Relaxation Rates
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