Photoelectron Angular Distributions as Probes of Cluster Anion Structure: I-center dot(H2O)(2) and I-center dot(CH3CN)(2)

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Author list: Mbaiwa F, Holtgrewe N, Dao DB, Lasinski J, Mabbs R

Publisher: American Chemical Society

Place: WASHINGTON

Publication year: 2014

Journal: The Journal of Physical Chemistry A (1089-5639)

Journal acronym: J PHYS CHEM A

Volume number: 118

Issue number: 35

Start page: 7249

End page: 7254

Number of pages: 6

ISSN: 1089-5639

eISSN: 1520-5215

Languages: English-Great Britain (EN-GB)

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Abstract

The use of photoelectron angular distributions to provide structural details of cluster environments is investigated. Photoelectron spectra and angular distributions of I-center dot(H2O)(2) and I-center dot(CH3CN)(2) duster anions are recorded over a range of photon energies. The anisotropy parameter (beta) for electrons undergoes a sharp change (A,6,a.) at photon energies close to a detachment channel threshold. I-center dot(H2O)(2) results show the relationship between dipole moment and Delta beta(max) to be similar to that observed in monosolvated I- detachment. The Delta beta(max) of the 4.0 eV band in the I-center dot(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-center dot(CH3CN)(2) cluster anion [Timerghazin, Q K.; Nguyen, T. N.; Peslherbe, G. H. J. Chem. Phys. 2002, 116, 6867-6870].

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