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.

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).

A BOXCARS investigation of vibrational relaxation in highly excited 1, 2-trans-dichloroethene

1993 ◽  
Vol 71 (11-12) ◽  
pp. 547-551 ◽  
Author(s):  
L. Wang ◽  
J. R. Xu ◽  
W. E. Jones
Keyword(s):  
Energy Transfer ◽  
Excitation Energy ◽  
Vibrational Relaxation ◽  
Vibrational Energy ◽  
Temporal Evolution ◽  
Maximum Energy ◽  
Vibrational Energy Transfer ◽  
Vibrational Energies

The BOXCARS technique has been used to study the collisional vibrational energy transfer from 1, 2-trans-dichloroethene excited into a quasicontinuum by a pulsed CO2 laser. The temporal evolution behaviour for vibrational energies in different modes was obtained. It has been shown that both the rate and maximum energy transferral to the ν4 mode are slightly larger than rates and energy transferral to the ν1 and ν2 modes and that this specificity declines with increase in excitation energy. The mechanism for this specificity is discussed.

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.

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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