title: Infrared spectroscopy of the Li+(H2O)Ar complex: the role of internal energy and its dependence on ion preparation.
abstract: The internal energy or effective temperature of cluster ions has become an important issue in characterizing the structures observed in these species. This report considers the role played by the method of ion preparation (laser vaporization-supersonic expansion versus ion impact-evaporative cooling) in governing the internal energy of a specific species, Li(+)(H(2)O)Ar. Vibrational predissociation spectroscopy of the O-H stretch modes revealed rotational features, which were used to characterize the structure and effective rotational temperature of the cluster ion. In addition, the impact of the lithium ion on the H(2)O molecule was analyzed in terms of the vibrational frequency shifts, relative IR intensities, and H(2)O geometry.
authors.affiliation: Department of Chemistry, University of Illinois, 600 South Mathews Avenue, Urbana, IL 61801, USA.
authors.forename: Timothy D
authors.initials: TD
authors.lastname: Vaden
authors.forename: James M
authors.initials: JM
authors.lastname: Lisy
authors.forename: Prosser D
authors.initials: PD
authors.lastname: Carnegie
authors.forename: E Dinesh
authors.initials: ED
authors.lastname: Pillai
authors.forename: Michael A
authors.initials: MA
authors.lastname: Duncan
mesh_terms: D001128:Argon / Q000032:analysis / Q000737:chemistry*; D003198:Computer Simulation; D004735:Energy Transfer; D005740:Gases / Q000032:analysis / Q000737:chemistry*; D007477:Ions / Q000032:analysis / Q000737:chemistry*; D018020:Lithium Compounds / Q000032:analysis / Q000737:chemistry*; D008956:Models, Chemical; D008958:Models, Molecular; D013055:Spectrophotometry, Infrared / Q000379:methods*
chemical_list: D005740:Gases; D007477:Ions; D018020:Lithium Compounds; D001128:Argon; C028467:lithium hydroxide