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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 53, Iss. 7 — Jul. 1, 1963
  • pp: 840–842

Determination of the Refractive Indices of Gases in the Vacuum Ultraviolet. I. The čerenkov Radiation Method

D. W. O. HEDDLE, R. E. JENNINGS, and A. S. L. PARSONS  »View Author Affiliations

JOSA, Vol. 53, Issue 7, pp. 840-842 (1963)

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A method of measuring refractive indices of gases in the vacuum ultraviolet using the electron beam from a 4.5-MeV microtron to produce Čerenkov radiation in the gases is described. In this method the threshold pressures for Čerenkov radiation in the ultraviolet and visible regions are compared for electrons of the same velocity. The ultraviolet detectors used in the present experiment are photomultipliers with gold photocathodes and windows of: (a) fused silica, and (b) “Spectrosil” to give results at about 1900 Å and a nitric oxide ionization chamber with a lithium fluoride window for results at about 1200 Å.

Preliminary results are quoted for the refractive indices of argon and nitrogen at the above wavelengths. The calculation of dispersion formulas has been deferred until further measurements have been made.

D. W. O. HEDDLE, R. E. JENNINGS, and A. S. L. PARSONS, "Determination of the Refractive Indices of Gases in the Vacuum Ultraviolet. I. The čerenkov Radiation Method," J. Opt. Soc. Am. 53, 840-842 (1963)

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  1. T. Larsen, dissertation 1939, Zur Kenntnis der Refraktion und Dispersion von Edelgasen und edelgasäunlichien Hydriden und Deutriden (Gleerupska Universtät-Bokhandeln, Lund, Sweden).
  2. A. Dalgarno and A. E. Kingston, Proc. Roy. Soc. (London) A259, 424 (1960).
  3. J. Koch, Arkiv. Mat. 9, No. 6 (1913).
  4. P. G. Wilkinson, J. Opt. Soc. Am. 50, 1002 (1960).
  5. R. E. Jennings and P. I. P. Kalmus, Nucl. Instr. Methods 6, 209 (1960).
  6. D. K. Aitken, R. E. Jennings, A. S. L. Parsons, and R. N. F. Walker, Transition Radiation in Cerenkov Detectors (to be published).
  7. M. R. Bhiday, R. E. Jennings, and P. I. P. Kalmus, Proc. Phys. Soc. (London) 72, 973 (1958).
  8. See, for instance, J. V. Jelley, Čerenkov Radiation (Pergamon Press, Ltd., London, 1958).

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