A study of vibrational-rotational energy exchange in a shock tube

1971 ◽  
Vol 325 (1561) ◽  
pp. 197-206 ◽  
Keyword(s):  
Energy Transfer ◽  
Energy Exchange ◽  
Room Temperature ◽  
Vibrational Energy ◽  
Theoretical Calculations ◽  
Relaxation Times ◽  
Vibrational Energy Transfer ◽  
Para Hydrogen ◽  
Schlieren Method ◽  
Hydrogen Mixtures

Vibrational relaxation times have been measured in CO 2 + H 2 mixtures from 344 to 742 K by a laser-schlieren method. Normal and para hydrogen mixtures have been used. The scatter in the results is small and there is excellent agreement with a recent ultrasonic measurement at room temperature. The results are not in accord with the theoretical calculations of Sharma. They show that both rotational-vibrational and translational-vibrational energy transfer must be important for this case and throw light on the importance of rotational-vibrational energy transfer in other systems.

scholarly journals The calculation of TV, VT, VV, VV' − rate coefficients for the collisions of the main atmospheric components

1998 ◽  
Vol 16 (7) ◽  
pp. 838-846 ◽  
Author(s):  
A. S. Kirillov
Keyword(s):  
Experimental Data ◽  
Energy Transfer ◽  
Vibrational Energy ◽  
Relaxation Times ◽  
Atmospheric Composition ◽  
Rate Coefficients ◽  
Frequency Change ◽  
Vibrational Energy Transfer ◽  
Ion Chemistry ◽  
Vibrationally Excited

Abstract. The first-order perturbation approximation is applied to calculate the rate coefficients of vibrational energy transfer in collisions involving vibrationally excited molecules in the absence of non-adiabatic transitions. The factors of molecular attraction, oscillator frequency change, anharmonicity, 3-dimensionality and quasiclassical motion have been taken into account in the approximation. The analytical expressions presented have been normalized on experimental data of VT-relaxation times in N2 and O2 to obtain the steric factors and the extent of repulsive exchange potentials in collisions N2-N2 and O2-O2. The approach was applied to calculate the rate coefficients of vibrational-vibrational energy transfer in the collisions N2-N2, O2-O2 and N2-O2. It is shown that there is good agreement between our calculations and experimental data for all cases of energy transfer considered.Key words. Ionosphere (Auroral ionosphere; ion chemistry and composition). Atmospheric composition and structure (Aciglow and aurora).

Vibrational Energy Transfer in Silane and Silane Mixtures

1976 ◽  
Vol 31 (10) ◽  
pp. 1203-1209 ◽  
Author(s):  
Willi Janiesch ◽  
Helmut Ulrich ◽  
Peter Hess
Keyword(s):  
Experimental Data ◽  
Energy Transfer ◽  
Relaxation Time ◽  
Vibrational Relaxation ◽  
Energy Exchange ◽  
Vibrational Energy ◽  
Vibrational Energy Transfer

Abstract The vibrational relaxation time for pure SiH4 is 0.10, 0.083 and 0.072 μsec atm (±30%) at 295 K, 375 K and 462 K. For SiH4 diluted in He, D2 and H2 the corresponding numbers are 0.16, 0.081 and 0.031 μsec atm (± 30%) at 295 K. The binary two-level theory has been used to deter-mine the four V -R, T rates in the system SiH4 -CH4, and the rate for V-V exchange between SiH4 and CH4 from experimental data. From the Schwartz-Slawsky-Herzfeld-formula for V -T and V -V, T processes an equation is derived describing V -R and V -V, R energy exchange. The different models are compared with experimental data, especially with those found for the system SiH4 -CH4.

Room temperature measurements of CO 2 (v 2 )-O vibrational energy transfer

2005 ◽  
Author(s):  
Karen J. Castle ◽  
Katherine M. Kleissas ◽  
Justin M. Rhinehart ◽  
Eunsook S. Hwang ◽  
James A. Dodd
Keyword(s):  
Energy Transfer ◽  
Room Temperature ◽  
Vibrational Energy ◽  
Temperature Measurements ◽  
Vibrational Energy Transfer

Vibrational Energy Transfer in CHF3 -Mixtures

1976 ◽  
Vol 31 (10) ◽  
pp. 1268-1270 ◽  
Author(s):  
K. Frank ◽  
P. Hess
Keyword(s):  
Energy Transfer ◽  
Vibrational Relaxation ◽  
Vibrational Energy ◽  
Relaxation Times ◽  
Rare Gas ◽  
Vibrational Energy Transfer

Abstract The vibrational relaxation times for pure CHF, and CHF3 diluted in H2, D2, Ar, Kr and Xe are 0.55; 0.01, 0.025, 2.6, 4.8, and 5.6 /μsec atm at 298 K. These measurements complete previous results obtained for the systems CHF3-He, Ne, Ar. Correlation of the rare-gas results according to SSH-theory shows that relatively small rotational contributions may be expected for the heavy collision partners Kr and Xe.

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