Abstract
The vibrational energy relaxation and distribution in SF6 at the collisional condition of 2 Torr was
measured with the pump-probe method by use of two tunable CO2 300 ns-pulse lasers at the delay time up
to 400 μs. The 10.6 μs P(30) pump intensity was 0.4 J/cm2. The probed spectra, divided into two parts, the
induced transmission at the P(10)–P(22) and the absorption at the P(24)–P(32), were red-shifted by 50 μs
and then slowly back to the initial. The time variation of induced signals was divided into the four regions
due to the following processes; (I) the formation of nonthermal distribution in the