Summary: Multiphoton ionization vibrational state selection of H2O+
Brady W. Uselman, Jason M. Boyle, Scott L. Anderson *
Department of Chemistry, University of Utah, 315 S. 1400 E. Rm 2020, Salt Lake City, UT 84112-0850, United States
Received 12 March 2007; in final form 5 April 2007
Available online 18 April 2007
We present a study of single color (2 + 1) resonance-enhanced multiphoton ionization (REMPI) of H2O, D2O, and HDO via several
Rydberg states lying in the energy range from 80000 to 86000 cmÀ1
. Photoelectron spectra (PES) show that the corresponding cations
can be vibrationally state-selected for most vibrational states. The exception is the bend of H2O+
, where mixing in the
REMPI intermediate level results in weak ion intensity and only $50% state purity.
Ó 2007 Elsevier B.V. All rights reserved.
The water cation is important in a number of environ-
ments, including the upper atmosphere  and comet