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Comparative Very-High-Resolution Vuv Spectroscopy: Laser Spectroscopy Ofo2

Author

Listed:
  • B. R. LEWIS

    (Research School of Physical Sciences and Engineering, The Australian National University, Canberra, Australian Capital Territory 0200, Australia)

  • S. T. GIBSON

    (Research School of Physical Sciences and Engineering, The Australian National University, Canberra, Australian Capital Territory 0200, Australia)

  • K. G. H. BALDWIN

    (Research School of Physical Sciences and Engineering, The Australian National University, Canberra, Australian Capital Territory 0200, Australia)

  • P. M. DOOLEY

    (Research School of Physical Sciences and Engineering, The Australian National University, Canberra, Australian Capital Territory 0200, Australia)

  • K. WARING

    (Research School of Physical Sciences and Engineering, The Australian National University, Canberra, Australian Capital Territory 0200, Australia)

Abstract

Despite their importance to the photochemistry of the terrestrial atmosphere, and many experimental studies, previous characterization of the Schumann–Runge (SR) bands ofO2,$B^3 \Sigma_u^- \leftarrow X^3\Sigma_g^- (v, 0)$(1750–2050 Å) has been limited by poor experimental resolution. In addition, our understanding of the SR spectrum is incomplete, many rovibrational transitions in the perturbed region of the spectrum[B(v > 15)]remaining unassigned. We review new very-high-resolution measurements of theO2photoabsorption cross section in the SR bands. Tunable, narrow-bandwidth background vacuum-ultraviolet (VUV) radiation for the measurements (~ 7 × 105resolving power) was generated by the two-photon-resonant difference-frequency four-wave mixing in Xe of excimer-pumped dye-laser radiation. With the aid of these cross-section measurements, rovibrational and line-shape analyses have led to new insights into the molecular structure and predissociation dynamics ofO2. The current VUV laser-spectroscopic measurements are shown to compare favourably with results from two other very-high-resolution experimental techniques, namely laser-induced fluorescence spectroscopy and VUV Fourier-transform spectroscopy, the latter performed using a synchrotron source.

Suggested Citation

  • B. R. Lewis & S. T. Gibson & K. G. H. Baldwin & P. M. Dooley & K. Waring, 2002. "Comparative Very-High-Resolution Vuv Spectroscopy: Laser Spectroscopy Ofo2," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 9(01), pages 31-38.
    • Handle: RePEc:wsi:srlxxx:v:09:y:2002:i:01:n:s0218625x02001690
    DOI: 10.1142/S0218625X02001690
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