Vibrational population lifetimes of polyatomic molecules in liquids

Quantum interference effects on the collisional excitation of the Fermi doublet states of CO2 by hot electrons and hot H(D) atoms

“….6 (J=24) 12 Typical time-resolved signals display a detector-limited fast rise (~700 ns) followed by a slow rise or decay.19-23 The time between COz/COz, I z /C0 2 , or C0 2 iH 2 S collisions at 25 mTorr is ~4 f..Ls, much slower than the detector response time. Thus, the fast rise amplitude represents the nascent population produced by hot H atom/COz or hot electron/C0 2 collisions.…”

Effect of intermolecular interactions on vibrational-energy transfer in the liquid phase

“…The shift of the absorption band after the IVR process can be so large that the absorption band shifts completely out of the bandwidth of the ir pulse, as is observed after excitation of the symmetric CH 3 vibration of CH 3 S chemisorbed to Ag (1,1,1) . 15,17 In previous infrared pump-probe experiments on dihalo and trihalomethanes (haloforms) 19-21 it was found that the frequency shift of the absorption band leads to a transient increase or decrease of the absorption coefficient.…”

“…'l'g have the same absorption band to the sets {'l'J and {I})1 ¢liq,g( {I}» and (¢liq,gC {I}) 1 ¢liq,i( {I}» only depends on the energy differences of the liquid energy…”

Vibrational Population Relaxation in Liquids

“…Laubereau et a1. 84 have made some qualitative and semiquantitative estimates of the dominant contributions to vibrational relaxation of C-H stretches for five molecules in the neat liquid and CCl, solution. They suggest that rotational coupling will be very important for CH,I relaxation and moderately important for CHC1, and CH,Cl,, while resonant transfer of one quantum of a second harmonic to a near neighbor is very important for CH,CCI, and moderately important for CH,Cl, and CH,CH,OH.…”