Role of adsorbate structure in the dynamics of surface photodissociation

D. Howard Fairbrother; Victor P. Holbert; Kimberly A. Briggman; Peter C. Stair; Eric Weitz

doi:10.1117/12.221479

25 September 1995 Role of adsorbate structure in the dynamics of surface photodissociation

D. Howard Fairbrother, Victor P. Holbert, Kimberly A. Briggman, Peter C. Stair, Eric Weitz

Proceedings Volume 2547, Laser Techniques for Surface Science II; (1995) https://doi.org/10.1117/12.221479
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

Photofragments produced following 257 nm irradiation of physiosorbed methyl iodide on MgO(100) and TiO₂(110) 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. The dependence of the velocity distribution of methyl photofragments on ejection angle and polarization of the photolysis beam indicates that the multilayer film is composed primarily of an anti-parallel arrangement of methyl iodide molecules whose C-I bonds are aligned close to the surface normal. At submonolayer coverage on TiO₂ methyl iodide is predominantly in a parallel orientation with the iodine close to the surface and the methyl group pointing away from the surface.

Citation Download Citation

D. Howard Fairbrother, Victor P. Holbert, Kimberly A. Briggman, Peter C. Stair, and Eric Weitz "Role of adsorbate structure in the dynamics of surface photodissociation", Proc. SPIE 2547, Laser Techniques for Surface Science II, (25 September 1995); https://doi.org/10.1117/12.221479

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