Analysis of molecular adsorbates by laser-induced thermal desorption

Robert T. McIver Jr.; John C. Hemminger; D. Parker; Yong Li; Donald P. Land; Claire L. Pettiette-Hall

doi:10.1117/12.45137

1 April 1991 Analysis of molecular adsorbates by laser-induced thermal desorption

Robert T. McIver Jr., John C. Hemminger, D. Parker, Yong Li, Donald P. Land, Claire L. Pettiette-Hall

Proceedings Volume 1437, Applied Spectroscopy in Material Science; (1991) https://doi.org/10.1117/12.45137
Event: Optics, Electro-Optics, and Laser Applications in Science and Engineering, 1991, Los Angeles, CA, United States

Abstract

A surface analysis method called LITD/FTMS has been used to measure the rate constants and detect the reaction intermediates for the dehydrogenation of various hydrocarbons on platinum. Laser-induced thermal desorption (LITD) utilizes a pulsed laser beam to rapidly heat the surface and remove intact neutral molecular species. These are then ionized by an electron beam, trapped in a magnetic field, and detected by Fourier transform mass spectrometry (FTMS). FTMS has two advantageous features: high mass resolution and the ability to record all masses simultaneously from a single laser shot. LITD/FTMS is a highly sensitive and rapid method for identifying complex molecular species adsorbed on surfaces. Intermediates in catalytic reactions can be observed and rate constants for surface-catalyzed reactions can be measured.

Citation Download Citation

Robert T. McIver Jr., John C. Hemminger, D. Parker, Yong Li, Donald P. Land, and Claire L. Pettiette-Hall "Analysis of molecular adsorbates by laser-induced thermal desorption", Proc. SPIE 1437, Applied Spectroscopy in Material Science, (1 April 1991); https://doi.org/10.1117/12.45137

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