104-fold isotope effect: Vibrational predissociation in ArDF

Published

July 1, 1996

Author(s)

S Davis, J T. Farrell, D T. Anderson, David Nesbitt

Abstract

High-resolution sub-Doppler line shapes for ArDf excited into the v_DF=1 manifold are recorded using a turnable laser/slit supersonic expantion near-infrared spectrometer. Direct spectroscopic evidence is obtained for vibrational predissociation (τless than or equal to}130 ns), in dramatic contrast with the highly metastable ArHF (v_HF=1) species (2.69140 MHz less than or equal to}4.3(8) MHz) observed in bolometry studies. To the best of our knowledge, this represents an unprecedentedly large (>10⁴-fold), inverse isotope effect. Furthermore, a clear dependence of the ArDF predissociation rates on intermolecular mode, excited in combination with the DF stretch, is observed (61(30) ns ≥τV_HF+Σ_bend≥94(60) ns).

Citation

Chemical Physics Letters

Volume

246

Issue

No. 1-2

Pub Type

Journals

Keywords

isotope, vibrational predissociation

Citation

Davis, S. , Farrell, J. , Anderson, D. and Nesbitt, D. (1996), 104-fold isotope effect: Vibrational predissociation in ArDF, Chemical Physics Letters (Accessed May 3, 2024)