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Proceedings Paper

Energy and angular distributions of particles desorbed from surfaces using multiphoton resonance ionization detection
Author(s): Roya Maboudian; M. El-Maazawi; Z. Postawa; C. T. Reimann; Geoffrey P. Malafsky; D. M. Hrubowchak; Matthew H. Ervin; Barbara J. Garrison; Nicholas Winograd
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Paper Abstract

Multiphoton resonance excitation has been employed to ionize neutral atoms and molecules desorbed from surfaces bombarded by 5 keV Ar+ ion beams. By positioning a laser beam above the target it is possible to image the ions onto a microchannelplate detector and to obtain energy and angle-resolved distributions. These distributions may be compared directly to classical dynamics computer simulations of the ion/impact event. Results are presented using the (001), (111) and (331) crystal faces of Rh to illustrate how the distributions contain specific structural information. Moreover, we compare the distributions from (111) to secondary ion angular distributions. This comparison suggests that there are special impact points which lead to ion formation from clean metal surfaces. Finally, we present preliminary measurements for the MPRI of pyrene molecules desorbed from polycrystalline gold surfaces. The results suggest this technique may be valuable for monitoring reaction intermediates present at very low concentration on catalyst surfaces.

Paper Details

Date Published: 1 July 1990
PDF: 9 pages
Proc. SPIE 1208, Laser Photoionization and Desorption Surface Analysis Techniques, (1 July 1990); doi: 10.1117/12.17868
Show Author Affiliations
Roya Maboudian, The Pennsylvania State Univ. (United States)
M. El-Maazawi, The Pennsylvania State Univ. (United States)
Z. Postawa, The Pennsylvania State Univ. (United States)
C. T. Reimann, The Pennsylvania State Univ. (United States)
Geoffrey P. Malafsky, The Pennsylvania State Univ. (United States)
D. M. Hrubowchak, The Pennsylvania State Univ. (United States)
Matthew H. Ervin, The Pennsylvania State Univ. (United States)
Barbara J. Garrison, The Pennsylvania State Univ. (United States)
Nicholas Winograd, The Pennsylvania State Univ. (United States)


Published in SPIE Proceedings Vol. 1208:
Laser Photoionization and Desorption Surface Analysis Techniques
Nicholas S. Nogar, Editor(s)

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