Energy and angular distributions of particles desorbed from surfaces using multiphoton resonance ionization detection

Roya Maboudian; M. El-Maazawi; Z. Postawa; C. T. Reimann; Geoffrey P. Malafsky; D. M. Hrubowchak; Matthew H. Ervin; Barbara J. Garrison; Nicholas Winograd

doi:10.1117/12.17868

1 July 1990 Energy and angular distributions of particles desorbed from surfaces using multiphoton resonance ionization detection

Roya Maboudian, M. El-Maazawi, Z. Postawa, C. T. Reimann, Geoffrey P. Malafsky, D. M. Hrubowchak, Matthew H. Ervin, Barbara J. Garrison, Nicholas Winograd

Author Affiliations +

Proceedings Volume 1208, Laser Photoionization and Desorption Surface Analysis Techniques; (1990) https://doi.org/10.1117/12.17868
Event: OE/LASE '90, 1990, Los Angeles, CA, United States

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.

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Roya Maboudian, M. El-Maazawi, Z. Postawa, C. T. Reimann, Geoffrey P. Malafsky, D. M. Hrubowchak, Matthew H. Ervin, Barbara J. Garrison, and Nicholas Winograd "Energy and angular distributions of particles desorbed from surfaces using multiphoton resonance ionization detection", Proc. SPIE 1208, Laser Photoionization and Desorption Surface Analysis Techniques, (1 July 1990); https://doi.org/10.1117/12.17868

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