title: Photoelectron angular distributions as probes of cluster anion structure: I(-)·(H2O)2 and I(-)·(CH3CN)2.
abstract: The use of photoelectron angular distributions to provide structural details of cluster environments is investigated. Photoelectron spectra and angular distributions of I(-)·(H2O)2 and I(-)·(CH3CN)2 cluster anions are recorded over a range of photon energies. The anisotropy parameter (β) for electrons undergoes a sharp change (Δβmax) at photon energies close to a detachment channel threshold. I(-)·(H2O)2 results show the relationship between dipole moment and Δβmax to be similar to that observed in monosolvated I(-) detachment. The Δβmax of the 4.0 eV band in the I(-)·(CH3CN)2 photoelectron spectrum suggests a dipole moment of 5-6 D. This is consistent with predictions of a hydrogen bonded conformer of the I(-)·(CH3CN)2 cluster anion [Timerghazin, Q. K.; Nguyen, T. N.; Peslherbe, G. H. J. Chem. Phys. 2002, 116, 6867-6870].
authors.affiliation: Department of Chemistry, University of Botswana , Private Bag UB00704, Gaborone, Botswana.
authors.forename: Foster
authors.initials: F
authors.lastname: Mbaiwa
authors.forename: Nicholas
authors.initials: N
authors.lastname: Holtgrewe
authors.forename: Diep Bich
authors.initials: DB
authors.lastname: Dao
authors.forename: Joshua
authors.initials: J
authors.lastname: Lasinski
authors.forename: Richard
authors.initials: R
authors.lastname: Mabbs