Ultrafast infrared spectroscopy of vibrational CO-stretch up-pumping and relaxation dynamics of W(CO) 6

Abstract

The ultrafast infrared (IR) vibrational up-pumping and energy relaxation dynamics are reported of the T 1u CO-stretching manifold of W(CO) 6 in room temperature n-hexane solution. The frequency and energy content of the tunable 2 ps IR pump pulse strongly influences the distribution of vibrational level population. With broadband transient IR absorption spectroscopy, vibrational T 1 lifetimes of the overtone states of W(CO) 6 were directly determined to be 140 ± 20 (1 σ) ps for ν = 1, 75 ± 20 ps for ν = 2 and 30 ± 15 ps for ν = 3. T 1u to E g intermode energy transfer occurs on the 10–20 ps timescale.