Nascent rotational distribution for LiH(v = 0-3,J) states from collisions with H2(E = 4300 and 4800cm-1)

Abstract

Rotationally state selective excitation of H2(v=1, J=1 or 3) was achieved by stimulated Raman pumping. The full state-resolved distribution of scattered LiH(v=0–3, J=0~13)molecules from collisions with excited H2(E=4300 and 4800cm−1) is reported. Nascent rotational and translational energy profiles for scattered LiH(v=0~3) molecules with J=0~13 were measured using high-resolution transient laser induced fluorescence(LIF). The product translational energy for individual J-states increases by 120% for a 13% increase in donor energy. The scattered LiH(v=0, J=0~13) molecules have a biexponential rotational distribution. Fitting the data with a two-component exponential model yields a low-energy distribution and a high-energy distribution. The rotational distribution is sensitive to donor energy. Rotational distributions of scatted LiH(v=1–3) molecules were also measured. The distribution yielded rotational temperatures at 690K for LiH/H2(E=4300cm−1) and 730K for LiH/H2(E=4800cm−1), respectively. The rate constants for appearance LiH(v=0–3,J) were determined.