Rotational relaxation in a free expansion of HCl

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Abstract
The rotational relaxation of HCl in a free jet expansion was studied in a pump-and-probe experiment using infrared laser excitation and resonant multiphoton ionization detection. Rate constants were determined for various J to J′ energy transfer processes in the vibrationally excited molecule. There is a strong indication that the rotational energy transfer occurs via a near-resonant dipole–dipole interaction between vibrationally excited and vibrationally cold HCl molecules.