Abstract
Fully resolved rotational structure in the high-frequency vibrational region of the ArHCl van der Waals complex has been recorded under thermal equilibrium conditions at T=127 K with a tunable difference-frequency laser. Both the fundamental HCl stretch and its combination with the low-frequency large-amplitude bend (libration) have been observed with comparable intensities. An abrupt cutoff of the spectrum at high J due to rotational predissociation yields a measure of the binding energy of the complex. The band centre shifts and rotational and distortion constants provide much information about the interaction potential surface and its vibrational dependence and about perturbations from other low-frequency modes not directly observed.
Published Version
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