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Photodesorption of NH3 from GaAs. A resonance-enhanced multiphoton ionization study

✍ Scribed by X.-Y. Zhu; J.M. White; K.H. Junker

Publisher: Elsevier Science
Year: 1994
Tongue: English
Weight: 398 KB
Volume: 226
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(94)00710-1

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✦ Synopsis

The photodesorption of NH3 from GaAs (100) at 193 nm has been characterized using 2 + 1 resonance-enhanced multiphoton ionization (REMPI) spectroscopy via the intermediate B state. The final state distribution ofphotodesorbed NH3 is nonthermal: the translational and rotational distributions can be approximated by Boltzmann temperatures of Ttr~=300_+ 30 and T,,t = 350 _+ 50 K, respectively, with a relative population of 6% _+ 2% in the o2 = 1 vibrational level (or T~ib = 490_+ 60 K ). Possible energy transfer mechanisms responsible for desorption are discussed.

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