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Marcel Mudrich

Predissociation dynamics of lithium iodide

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  • H. Schmidt, Albert-Ludwigs-Universität Freiburg
  • ,
  • Johannes Von Vangerow, Albert-Ludwigs-Universität Freiburg
  • ,
  • F. Stienkemeier, Albert-Ludwigs-Universität Freiburg
  • ,
  • A. S. Bogomolov, Institute for Chemical Kinetics and Combustion
  • ,
  • A. V. Baklanov, Institute for Chemical Kinetics and Combustion, Novosibirsk State University
  • ,
  • D. M. Reich, University of Kassel
  • ,
  • W. Skomorowski, University of Kassel
  • ,
  • C. P. Koch, University of Kassel
  • ,
  • M. Mudrich

The predissociation dynamics of lithium iodide (LiI) in the first excited A-state is investigated for molecules in the gas phase and embedded in helium nanodroplets, using femtosecond pump-probe photoionization spectroscopy. In the gas phase, the transient Li+ and LiI+ ion signals feature damped oscillations due to the excitation and decay of a vibrational wave packet. Based on high-level ab initio calculations of the electronic structure of LiI and simulations of the wave packet dynamics, the exponential signal decay is found to result from predissociation predominantly at the lowest avoided X-A potential curve crossing, for which we infer a coupling constant VXA = 650(20) cm-1. The lack of a pump-probe delay dependence for the case of LiI embedded in helium nanodroplets indicates fast droplet-induced relaxation of the vibrational excitation.

TidsskriftJournal of Chemical Physics
StatusUdgivet - 28 jan. 2015
Eksternt udgivetJa

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