I-(CH3I)2 photoexcitation: The influence of dipole bound states on detachment and fragmentation

Matthew Van Duzor, Foster Mbaiwa, Joshua Lasinski, Nicholas Holtgrewe, Richard Mabbs

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We present the results of a photoelectron imaging study of the I -(CH3I)2 cluster anion over excitation wavelengths 355-260 nm. The resulting spectra and photoelectron angular distributions (PADs) suggest extensive electron-molecule interaction following photoexcitation. Fragmentation channels are observed subsequent to excitation between 355 and 330 nm. The origin of these features, which begin 200 meV and peak 70 meV below the X band direct detachment threshold, is described in terms of a predissociative dipole bound state. The nature of the fragments detected and the energetics of the channel opening argue strongly in favor of an asymmetric, head to tail cluster anion geometry posited by Dessent Acc. Chem. Res. 31, 527 (1998)10.1021/ar950061f. Above the direct detachment threshold, PADs display evidence of phenomena akin to electron-molecule scattering. The fragment anions disappear above the X band threshold but reappear some distance below the second (A) direct detachment band. At these energies there is also rapid variation of the X band PAD, an observation attributed to autodetachment via spin-orbit relaxation of the iodine core of the cluster.

Original languageEnglish
Article number214301
JournalJournal of Chemical Physics
Volume134
Issue number21
DOIs
Publication statusPublished - Jun 7 2011

Fingerprint

Photoexcitation
Photoelectrons
photoexcitation
detachment
Angular distribution
fragmentation
photoelectrons
superhigh frequencies
dipoles
Anions
angular distribution
anions
thresholds
fragments
Molecules
Electrons
Iodine
iodine
excitation
molecules

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Van Duzor, Matthew ; Mbaiwa, Foster ; Lasinski, Joshua ; Holtgrewe, Nicholas ; Mabbs, Richard. / I-(CH3I)2 photoexcitation : The influence of dipole bound states on detachment and fragmentation. In: Journal of Chemical Physics. 2011 ; Vol. 134, No. 21.
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I-(CH3I)2 photoexcitation : The influence of dipole bound states on detachment and fragmentation. / Van Duzor, Matthew; Mbaiwa, Foster; Lasinski, Joshua; Holtgrewe, Nicholas; Mabbs, Richard.

In: Journal of Chemical Physics, Vol. 134, No. 21, 214301, 07.06.2011.

Research output: Contribution to journalArticle

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