HF multiquantum V→R relaxation rates with N2 and CO

• DOI: 10.1063/1.447767
• Publication Date: 2003-02-28T17:34:05Z
• Authors: Xue-Feng Yang; George C. Pimentel
• Keywords: Vibrational energy relaxation

Through photolysis of NF3/HI/M=1.5/0.5/38 Torr mixtures (M=N2,CO,Ar) in a grating cavity, HF rotational laser emission is produced for (v=0, J=21→20), (1,23→22), (2,24→23), and (3,18→17). Known attenuators are placed the cavity used to estimate absolute population inversions responsible gains. The results confirm role selective V→R resonant pumping these high J lasers. Further, they provide rough estimates Δv=2, Δ J=10, Δv=3, J=20 near-resonant rate constants relaxation by N2 from v=4, J=14, v=5, J=3, 4, 5 v=2, J=24. These fall range 10−13 10−14 cm3/molecule s, indicating that collision partners, multiquantum processes with Δv=3 may contribute few percent total v=5 vibrational rate. They also suggest that, both CO, channels (including Δv=1) dominant process.