Rotational population transfer in HF

Population transfer between rotational levels in HF was observed using double resonance with two HF lasers. Rates for the transfer in v=1 from J=3 to J=4, 5, 6, and 7 were found in the range of 107 sec−1 Torr−1. The rates depended on both gas pressure and on the ΔJ separation between levels of transfer.