Abstract
Ultra-sensitive infrared absorption spectroscopy in a slit supersonic expansion is used to obtain the spectrum of each of the three low-frequency van der Waals vibrations in ArHCl in combination with the ν 1 HCl stretch. The (11 10) perpendicular bend is observed to be heavily perturbed by Coriolis interactions both with the nearby (10 01) van der Waals stretch and with the (12 00) parallel bend. The ArHCl complexes formed from ground-state HCl and from vibrationally excited HCl are quite similar, as evidenced by the nearly identical vibrational frequencies and rotational constants for the three corresponding pairs of low-frequency vibrational modes.
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