Molecular orientation and surface morphology in methyl iodide films grown on MgO(100) probed by photodissociation

D. Howard Fairbrother, K. A. Briggman, Peter C Stair, Eric Weitz

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Photofragments produced following 257 nm irradiation of physisorbed methyl iodide films on MgO(100) have been studied using resonantly enhanced multiphoton ionization coupled with time-of-flight mass spectrometry. The observed signal is associated with photofragment production from methyl iodide chromophores present in the near surface region. Data on the morphology of the evolving film, obtained by monitoring the variation in photofragment intensity with adsorbate coverage, are consistent with an overlayer that grows by a stochastic process. The dependence of the velocity distribution of methyl photofragments on ejection angle and polarization of the photolysis beam indicates that the film is composed primarily of an antiparallel arrangement of methyl iodide molecules whose C-I bonds are aligned close to the surface normal.

Original languageEnglish
Pages (from-to)13042-13049
Number of pages8
JournalJournal of Physical Chemistry
Volume98
Issue number49
Publication statusPublished - 1994

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Photodissociation
Molecular orientation
photodissociation
iodides
Surface morphology
Photolysis
stochastic processes
Adsorbates
Chromophores
Velocity distribution
Random processes
ejection
chromophores
Ionization
Mass spectrometry
photolysis
mass spectroscopy
velocity distribution
Irradiation
Polarization

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Molecular orientation and surface morphology in methyl iodide films grown on MgO(100) probed by photodissociation. / Fairbrother, D. Howard; Briggman, K. A.; Stair, Peter C; Weitz, Eric.

In: Journal of Physical Chemistry, Vol. 98, No. 49, 1994, p. 13042-13049.

Research output: Contribution to journalArticle

Fairbrother, D. Howard ; Briggman, K. A. ; Stair, Peter C ; Weitz, Eric. / Molecular orientation and surface morphology in methyl iodide films grown on MgO(100) probed by photodissociation. In: Journal of Physical Chemistry. 1994 ; Vol. 98, No. 49. pp. 13042-13049.
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