MPI Spectroscopy Of NH3: Application To Rotational Energy Accommodation On Surfaces

Bruce D. Kay; A. J. Grimley; T. D. Raymond

doi:10.1117/12.976134

20 November 1985 MPI Spectroscopy Of NH₃: Application To Rotational Energy Accommodation On Surfaces

Bruce D. Kay, A. J. Grimley, T. D. Raymond

Proceedings Volume 0540, Southwest Conf on Optics '85; (1985) https://doi.org/10.1117/12.976134
Event: 1985 Albuquerque Conferences on Optics, 1985, Albuquerque, United States

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.

Citation Download Citation

Bruce D. Kay, A. J. Grimley, and T. D. Raymond "MPI Spectroscopy Of NH₃: Application To Rotational Energy Accommodation On Surfaces", Proc. SPIE 0540, Southwest Conf on Optics '85, (20 November 1985); https://doi.org/10.1117/12.976134

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