title: Soft X-ray absorption spectroscopy of Ar2 and ArNe dimers and small Ar clusters.
abstract: The X-ray absorption spectra (XAS) of Ar2 and ArNe dimers and small Ar clusters in the L2,3 region (244-252 eV) of the Ar atom have been recorded using synchrotron light and a combination of coincidence methods and kinetic energy discrimination of energetic ions. The absorption peaks in the spectra of the dimers and clusters were found to be shifted and broadened relative to the peaks in the spectrum of the Ar atom. In order to unambiguously relate these chemical shifts to the electronic structure of the core excited states in dimers, we performed ab initio calculations of the XAS spectra. Implications of the results for the use of XAS as a structure determination method in large rare gas clusters are discussed.
authors.affiliation: Theoretische Chemie, Physikalisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 229, 69120 Heidelberg, Germany.
authors.forename: Ghazal
authors.initials: G
authors.lastname: Jabbari
authors.forename: Tsveta
authors.initials: T
authors.lastname: Miteva
authors.forename: Vasili
authors.initials: V
authors.lastname: Stumpf
authors.forename: Kirill
authors.initials: K
authors.lastname: Gokhberg
authors.forename: Patrick
authors.initials: P
authors.lastname: O'Keeffe
authors.forename: Alessandra
authors.initials: A
authors.lastname: Ciavardini
authors.forename: Paola
authors.initials: P
authors.lastname: Bolognesi
authors.forename: Marcello
authors.initials: M
authors.lastname: Coreno
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Avaldi
authors.forename: Elham
authors.initials: E
authors.lastname: Keshavarz
authors.forename: Maryam
authors.initials: M
authors.lastname: Ghandehari
authors.forename: Manijeh
authors.initials: M
authors.lastname: Tozihi
authors.forename: Carlo
authors.initials: C
authors.lastname: Callegari
authors.forename: Michele
authors.initials: M
authors.lastname: Alagia
authors.forename: Kevin Charles
authors.initials: KC
authors.lastname: Prince
authors.forename: Antti
authors.initials: A
authors.lastname: Kivimäki
authors.forename: Robert
authors.initials: R
authors.lastname: Richter