Rotational dynamics and electronic energy partitioning in the electron-stimulated desorption of NO from Pt(111)

A. R. Burns, E. B. Stechel, D. R. Jennison

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Using laser resonance ionization, we have examined the rotational dynamics of neutral NO molecules desorbed by electron impact from a cold (80 K) Pt(111) surface. Previously [A. R. Burns, E. B. Steehel and D. R. Jennison, Phys. Rev. Lett. 58, 250 (1987) ], we observed “hot” rotational temperatures in the range 481–642 K for the v = 0, 1,2, and 3 vibrational levels. We now present more detailed data which do not reveal shifts or broadening in the rotationally selected NO velocity distributions as a function of rotational level J in the range = J — 2.5-29.5. The rotationally independent velocity distributions, peaked at 0.05 eV, as well as the rotational temperature can be understood within the framework of “electronically stimulated adsorbate rotation” (Burns et al> above). The model also predicts complete rotational alignment in a plane normal to the surface. In the laboratory, no alignment is observed, but this is most likely due to the presence of stray magnetic fields. We will also discuss our measurements which show an equal partitioning between the two lowest NO electronic states (2II l/2and 2n3/2)» and a preference for the it level which is perpendicular (antisymmetric) to the plane of rotation.

Original languageEnglish
Pages (from-to)895-898
Number of pages4
JournalJournal of Vacuum Science and Technology A: Vacuum, Surfaces and Films
Volume6
Issue number3
DOIs
Publication statusPublished - May 1988

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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