A. Tokmakoff et al., PHONON-INDUCED SCATTERING BETWEEN VIBRATIONS AND MULTIPHOTON VIBRATIONAL UP-PUMPING IN LIQUID SOLUTION, Chemical physics letters, 221(5-6), 1994, pp. 412-418
Fast phonon-induced scattering between an infrared active and a Raman
active vibration in solution is investigated using picosecond infrared
pump/anti-Stokes Raman probe experiments. Population from the infrare
d active T1u CO stretching mode of tungsten hexacarbonyl in carbon tet
rachloride at 1980 cm-1 scatters to the Raman active E(g) mode at 2012
cm-1 but not to the A1g mode at 2116 cm-1. Equilibration occurs rapid
ly compared to the 700 ps population relaxation time. A power dependen
ce of the line shape of the Raman mode indicates that significant popu
lation is pumped into high vibrational levels when high infrared pump
powers are used.