Rotational alignment of NO (A2Σ+) from collisions with Ne

Jeffrey Steill, Jeffrey Kay, Grant Paterson, Thomas R Sharples, Jacek Klos, Matthew Lawrence Costen, Kevin Strecker, Kenneth George McKendrick, Millard H Alexander, David Chandler

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

We report the direct angle-resolved measurement of collision-induced alignment of short-lived electronically excited molecules using crossed atomic and molecular beams. Utilizing velocity-mapped ion imaging, we measure the alignment of NO in its first electronically excited state (A(2)Sigma(+)) following single collisions with Ne atoms. We prepare A(2)Sigma(+) (nu = 0, N = 0, j = 0.5) and by comparing images obtained using orthogonal linear probe laser polarizations, we experimentally determine the degree of alignment induced by collisional rotational excitation for the final rotational states N' = 4, S, 7, and 9. The experimental results are compared to theoretical predictions using both a simple dassical hard-shell model and quantum scattering calculations on an ab initio potential energy surface (PES). The experimental results show overall trends in the scattering-angle dependent polarization sensitivity that are accounted for by the simple classical model, but structure in the scattering-angle dependence that is not. The quantum scattering calculations qualitatively reproduce this structure, and we demonstrate that the experimental measurements have the sensitivity to critique the best available potential surfaces. This sensitivity to the PES is in contrast to that predicted for ground-state NO(X) alignment.

Original languageEnglish
Pages (from-to)8163-8174
Number of pages12
JournalJournal of Physical Chemistry A
Volume117
Issue number34
Early online date23 Apr 2013
DOIs
Publication statusPublished - 29 Aug 2013

Keywords

  • DIFFERENTIAL CROSS-SECTIONS
  • POTENTIAL-ENERGY SURFACES
  • INELASTIC-SCATTERING
  • MOLECULAR-COLLISIONS
  • ANGULAR-MOMENTUM
  • (2)PI)AR SYSTEM
  • AR
  • STATE
  • DEPOLARIZATION
  • POLARIZATION

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    Steill, J., Kay, J., Paterson, G., Sharples, T. R., Klos, J., Costen, M. L., Strecker, K., McKendrick, K. G., Alexander, M. H., & Chandler, D. (2013). Rotational alignment of NO (A2Σ+) from collisions with Ne. Journal of Physical Chemistry A, 117(34), 8163-8174. https://doi.org/10.1021/jp402019s