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Light Scattering and Fluorescence in the Approach to Resonance — Stronger Probing Processes

  • C. M. Penney

Abstract

For some time there has been hope that many of the desirable qualities of Raman scattering for probing gas systems can be retained with orders of magnitude intensity enhancement by tuning the incident light near or into absorption regions. In this paper we present some of the results along this line obtained at GE and elsewhere. Calculations indicate that strong enhancement of electronic Raman scattering may be observed for many monatomic species upon excitation in near resonance; there is a good chance that similar results will be obtained for free radicals such as OH in flames. Moderately strong scattering has been observed from halogen molecules excited in absorption regions above their dissociation limits in the visible; it is likely that even stronger scattering will be observed from ozone through this process. Strong fluorescence from NO2, SO2 and I2 (below the dissociation limit) can be observed even at atmospheric pressure. The probe-relevant characteristics of these re-emission processes are discussed along with some potential applications.

Keywords

Raman Scattering Oscillator Strength Resonance Effect Resonance Scattering Dissociation Limit 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    Near resonance and resonance processes in the IR are discussed briefly by Helge Kildal and Robert L. Byer, Proc. IEEE, 59, 1644 (1971).CrossRefGoogle Scholar
  2. 2.
    C. M. Penney, J. Opt. Soc. Amer. 59, 34 (1969).ADSCrossRefGoogle Scholar
  3. 3.
    G. Placzek, “Rayleigh-Streuung und Raman Effekt,” in Handbuch der Radiologie 6, Part 2. Akadamische Verlagsgesellschaft, 1934.Google Scholar
  4. 4.
    D. G. Fouche, A. Herzenberg and R. K. Chang, J. Appl. Phys. 43, 3846 (1972).ADSCrossRefGoogle Scholar
  5. 5.
    R. L. St. Peters, S. D. Silverstein, M. Lapp and C. M. Penney, Phys. Rev. Lett. 30, 191 (1973);ADSCrossRefGoogle Scholar
  6. 5a.
    R. L. St. Peters and S. D. Silverstein, Optics Comm. 7, 193 (1973).ADSCrossRefGoogle Scholar
  7. 6.
    Marcel Jacon, Maurice Berjot, Lucien Bernard, C. R. Acad. Sc. Paris 273B, 956 (1971).Google Scholar
  8. 7.
    W. Holzer, W. F. Murphy and H. J. Bernstein, J. Chem. Phys. 52, 399 (1970).ADSCrossRefGoogle Scholar
  9. 8.
    G. F. Widhopf and S. Lederman, AIAA Journal 9, 309 (1971).ADSCrossRefGoogle Scholar
  10. 9.
    D. G. Fouche and R. K. Chang, Phys. Rev. Lett. 29, 536 (1972).ADSCrossRefGoogle Scholar
  11. 10.
    See, for example Shangyi Ch’en and Makoto Takeo, Rev. Mod. Phys. 29, 20 (1957);ADSMATHCrossRefGoogle Scholar
  12. 10a.
    W. R. Hindmarsh and Judith M. Farr, J. Phys. B, 2, 1388 (1969);ADSCrossRefGoogle Scholar
  13. 10b.
    C. L. Chen and A. V. Phelps, Phys. Rev. A7, 470 (1973).ADSGoogle Scholar
  14. 11.
    NASA Langley Research Center Report No. NASA SP-285, p. 76 (1971). Copies of this report can be obtained from the National Technical Information Service, Springfield, Virginia 22151.Google Scholar
  15. 12.
    Josef Behringer, “Observed Resonance Raman Spectra” in Raman Spectroscopy, Herman A. Szymanski, Ed., Plenum Press, 1967.Google Scholar
  16. 13.
    George W. Bethke, J. Chem. Phys. 31, 662 (1959).ADSCrossRefGoogle Scholar
  17. 14.
    M. Griggs, J. Chem. Phys. 49, 857 (1968).ADSCrossRefGoogle Scholar
  18. 15.
    M. R. Bowman, A. J. Gibson and M. C. W. Sandford, Nature 221, 456 (1969).ADSCrossRefGoogle Scholar
  19. 16.
    F. Felix, W. Keenliside, G. S. Kent and M. C. W. Sandford, “Laser Radar Measurements of Atmospheric Potassium,” paper presented at the Fifth Conference on Laser Radar Studies of the Atmosphere, Williamsburg, Va., June 4–6, 1973.Google Scholar
  20. 17.
    M. Jyumonji, T. Kobaysi and H. Inaba, “Measurements of Resonance Scattering Cross Sections of Sodium D Lines and Laser Radar Detection of the Sodium Layer in the Upper Atmosphere by a Tunable Dye Laser,” paper presented at the Fifth Conference on Laser Radar Studies of the Atmosphere, Williamsburg, Va., June 4–6, 1973.Google Scholar

Copyright information

© Springer Science+Business Media New York 1974

Authors and Affiliations

  • C. M. Penney
    • 1
  1. 1.General Electric Corporate Research & DevelopmentSchenectadyUSA

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