dc.creator Nicely, Amy L. en_US dc.creator Miller, Dorothy J. en_US dc.creator Lisy, James M. en_US dc.date.accessioned 2008-01-12T14:06:52Z dc.date.available 2008-01-12T14:06:52Z dc.date.issued 2007 en_US dc.identifier 2007-TG-03 en_US dc.identifier.uri http://hdl.handle.net/1811/31582 dc.description Author Institution: Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, IL 61801 en_US dc.description.abstract Competition between ion$\cdots$water electrostatic interactions and water$\cdots$water hydrogen bonding allows several structural isomers of hydrated rubidium cluster ions to exist simultaneously. The cluster ion temperature plays a large role in determining which of these non-covalent interactions will dominate. Colder temperatures favor isomers with multiple hydrogen bonds while warmer temperatures favor less-structured isomers with fewer hydrogen bonds. The temperature, or internal energy, of hydrated rubidium cluster ions is controlled by varying the evaporative path available for cluster formation. If the evaporation involves loss of water molecules, the final cluster ion temperature will be in the range of $300-350 K$. Evaporation of argon atoms generates substantially colder cluster ions with temperatures of $50-100 K$. Infrared photodissociation spectra of $Rb^+(H_2O)_n$ are compared with $Rb^+(H_2O)_nAr$ \textit{(n=3-5)} spectra to illustrate entropic effects on the relative abundance of structural isomers in $Rb^+(H_2O)_n$ clusters. The identification of isomers present is aided by parallel \textit{ab initio}, RRKM-EE and thermodynamics calculations. en_US dc.language.iso English en_US dc.publisher Ohio State University en_US dc.title TEMPERATURE DEPENDENCE OF $Rb^+(H_2O)_n$ AND $Rb^+(H_2O)_nAr$ (n=3-5) CLUSTER IONS en_US dc.type article en_US
﻿