Molecular Friction in Dilute Gases. III. Rotational Relaxation in Polyatomic Fluids

1962 ◽  
Vol 37 (9) ◽  
pp. 1947-1951 ◽  
Author(s):  
Norman F. Sather ◽  
John S. Dahler
Keyword(s):  
Rotational Relaxation ◽  
Dilute Gases ◽  
Polyatomic Fluids ◽  
Molecular Friction

Molecular Friction in Dilute Gases

1960 ◽  
Vol 33 (5) ◽  
pp. 1496-1504 ◽  
Author(s):  
J. T. O'Toole ◽  
J. S. Dahler
Keyword(s):  
Dilute Gases ◽  
Molecular Friction

Two-Dimensional Infrared Spectroscopy From the Gas to Liquid Phase: Density Dependent J-Scrambling, Vibrational Relaxation, and the Onset of Liquid Character

2019 ◽  
Author(s):  
Greg Ng Pack ◽  
Matthew Rotondaro ◽  
Parth Shah ◽  
Aritra Mandal ◽  
Shyamsunder Erramilli ◽  
...  
Keyword(s):  
Vibrational Energy ◽  
Rotational Relaxation ◽  
Vibrational Energy Relaxation ◽  
Pump Probe ◽  
Solution Dynamics ◽  
Supercritical Phase ◽  
Supercritical Solution ◽  
Asymmetric Stretch ◽  
Two Dimensional Infrared Spectroscopy ◽  
Vibrational Equilibrium

Ultrafast 2DIR spectra and pump-probe responses of the N2O n 3 asymmetric stretch in SF6 as a function of density from the gas to supercritical phase and liquid are reported. 2DIR spectra unequivocally reveal free rotor character at all densities studied in the gas and supercritical region. Analysis of the 2DIR spectra determines that J-scrambling or rotational relaxation in N2O is highly efficient, occurring in ~1.5 to ~2 collisions with SF6 at all non-liquid densities. In contrast, N2O n 3 vibrational energy relaxation requires ~15 collisions, and complete vibrational equilibrium occurs on the ~ns scale at all densities. An independent binary collision model is sufficient to describe these supercritical state point dynamics. The N2O n 3 in liquid SF6 2DIR spectrum shows no evidence of free rotor character or spectral diffusion. Using these 2DIR results, hindered rotor or liquid-like character is found in gas and all supercritical solutions for SF6 densities ³ r * = 0.3, and increases with SF6 density. 2DIR spectral analysis offers direct time domain evidence of critical slowing for SF6 solutions closest to the critical point density. Applications of 2DIR to other high density and supercritical solution dynamics and descriptions are discussed. <br>

Vibrational and Rotational Relaxation in Sulfur Dioxide

1971 ◽  
Vol 54 (2) ◽  
pp. 644-647 ◽  
Author(s):  
H. E. Bass ◽  
T. G. Winter ◽  
L. B. Evans
Keyword(s):  
Sulfur Dioxide ◽  
Rotational Relaxation ◽  
Vibrational And Rotational Relaxation

scholarly journals Measurements of charge state distributions of 0.74 and 1.4  MeV/u heavy ions passing through dilute gases

2017 ◽  
Vol 20 (4) ◽  
Author(s):  
P. Scharrer ◽  
Ch. E. Düllmann ◽  
W. Barth ◽  
J. Khuyagbaatar ◽  
A. Yakushev ◽  
...  
Keyword(s):  
Charge State ◽  
Heavy Ions ◽  
Dilute Gases ◽  
Charge State Distributions
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