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Proceedings Paper

MPI Spectroscopy Of NH3: Application To Rotational Energy Accommodation On Surfaces
Author(s): Bruce D. Kay; A. J. Grimley; T. D. Raymond
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Paper Abstract

An ultra-sensitive (> 10 6 cm-3/state) multiphoton ionization (MPI) spectroscopy for NH3 has been developed. This technique employs two-photon resonant, three-photon ionization via either the B or C' states of NH3. Symmetry constraints on the two-photon absorption enable the ground state inversion doublets to be easily resolved using conventional pulsed lasers. Computer simulations based on two-photon line strength factors and ground state rotational population distributions yield quantitative agreement with the observed spectra. Using this spectroscopy we have made the first measurement of rotational energy accommodation of a non-linear polyatomic molecule scattered from a surface. For NH3 scattered from polycrystalline tungsten, the scattering is dominated by trapping-desorption resulting in a high degree of rotational accommodation.

Paper Details

Date Published: 20 November 1985
PDF: 9 pages
Proc. SPIE 0540, Southwest Conf on Optics '85, (20 November 1985); doi: 10.1117/12.976134
Show Author Affiliations
Bruce D. Kay, Sandia National Laboratories (United States)
A. J. Grimley, Sandia National Laboratories (United States)
T. D. Raymond, Sandia National Laboratories (United States)

Published in SPIE Proceedings Vol. 0540:
Southwest Conf on Optics '85
Susanne C. Stotlar, Editor(s)

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