Vibrational deactivation of CO2(0001) by ethane

Rate constants for the transfer of energy from COiOO'I) to ethane and n-butane were measured using the laser induced fluorescence technique. The large magnitudes and the negative temperature dependence of the energy transfer rates indicate that near-resonant energy transfer processes caused by long range forces are responsible for the deactivation of the asymmetric stretching mode of CO 2 , It is shown that the combination bands in the alkanes are likely to receive the energy from CO 2 (OO'I). Using Sharma-Brau theory with Tam's modification and our experimental results, the square of the transition dipole matrix elements of V3+V6 and V 9 +v 1 I bands of ethane are estimated. At any given temperature in the range 300-730'K, the energy transfer cross section was found to increase linearly with n of C n H 2n + 2 • It is suggested that the absorption intensity of the combination bands of the alkanes also increases linearly with n in the spectral range 2300-2400 cm -I.

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Vibrational energy transfer in CO2–C2H2n+2 (n=0, 1, 2) mixtures from 220 to 300 K

Manzanares

Pinzón

Fumero

et al. 1983

The Journal of Chemical Physics

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Time resolved laser induced infrared fluorescence studies have been performed to obtain the rate constants of energy transfer of CO2 (ν3) in mixtures with C2H2, C2H4, and C2H6 at temperatures between 220 and 300 K. A pulsed 10.6 μm CO2 laser light has been used to directly excite the CO2 molecules at low temperatures. The CO2 self-relaxation was measured and the results are in agreement with previous measurements. The rate constants for the transfer of energy in the CO2–C2H2 system show normal temperature behavior, (rate constant increases as the temperature increases) associated with large energy defect and caused by short-range repulsive forces. The rate constants for the systems CO2–C2H4 and CO2–C2H6 show an inverse temperature effect, (rate constant increases as the temperature decreases) associated with near resonant energy exchange and long-range attractive forces between the molecules. The observed behavior with temperature for the three systems is explained using a Morse potential which includes repulsive and attractive terms to describe the interaction between the molecules and a probability expression formulated by H. K. Shin, to calculate the energy transfer probabilities of some important reactions considered for each system.

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Vibrational deactivation of CO2(0001) by ethane

Cited by 5 publications

References 13 publications

Resonance energy exchange effects in atmospheric transmission due to pollutants

Resonance energy exchange effects in atmospheric transmission due to pollutants

Vibrational energy transfer studies in CO2–hydrocarbon mixtures

Vibrational energy transfer in CO2–C2H2n+2 (n=0, 1, 2) mixtures from 220 to 300 K

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