Abstract

Absorption cross sections of argon and methane have been determined in their respective ionization continua, with particular emphasis on the short-wavelength range from 600 to 170 Å. A line emission spectrum from a high-voltage condensed spark discharge in nitrogen was used as a light source, and a maximum value of the cross section for argon beyond the <sup>2</sup><i>P</i><sub>½</sub><sup>0</sup> edge was measured to be 36.0× 10<sup>-18</sup> cm<sup>2</sup>. The oscillator strength for the transition into the continuum has been obtained by integrating the experimental curve of cross sections versus wavenumber from the ionization limit of argon down to about 170 Å and was found to be ƒ= 5.5. Similarly, short-wavelength cross sections in methane were combined with earlier results at longer wavelengths, and a total ƒf 7.6 was obtained. A comparison with the theoretical ƒ values indicates the need of more refined calculations for the photo-ionization of argon and methane.

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  1. G. L. Weissler, Handbuch der Physik, edited by S. Flügge (Springer-Verlag, Berlin, 1956), Vol. 21.
  2. K. Watanabe, Advan. Geophys. 5, 153 (1958).
  3. J. Quant. Spectry. Radiative Transfer 2, 375 (1962).
  4. H. Beutler, Z. Physik 93, 177 (1935).
  5. A. Pery-Thorne and W. R. S. Garton, Proc. Phys. Soc. (London) B76, 833 (1960).
  6. R. P. Madden and K. Codling, Phys. Rev. Letters 10, 516 (1963).
  7. P. Lee and G. L. Weissler, Phys. Rev. 99, 540 (1955).
  8. N. Wainfan, W. C. Walker, and G. L. Weissler, Phys. Rev. 99, 542 (1955).
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  10. G. R. Cook and P. Metzger (unpublished).
  11. R. E. Huffman, Y. Tanaka, and J. C. Larrabee, J. Chem. Phys. 39, 902 (1963).
  12. J. A. R. Samson, Phys. Rev. 132, 2122 (1963).
  13. A. Dalgarno, Proc. Phys. Soc. (London) A65, 663 (1952).
  14. J. W. Cooper, Phys. Rev. 128, 681 (1962).
  15. P. G. Wilkinson and H. L. Johnston, J. Chem. Phys. 18, 190 (1950).
  16. G. Moe and A. B. F. Duncan, J. Am. Chem. Soc. 74, 3140 (1952).
  17. K. Watanabe, M. Zelikoff, and E. C. Y. Inn, AFCRC Tech. Rept. No. 53–23 Geophys. Res. Paper No. 21 (1953).
  18. R. W. Ditchburn, Proc. Roy. Soc. (London) A229, 44 (1955).
  19. H. Sun and G. L. Weissler, J. Chem. Phys. 23, 1160 (1955).
  20. G. R. Cook and P. Metzger, J. Chem. Phys. (to be published).
  21. H. A. Bethe and E. Salpeter, Ref. 1, Vol. 35.

Bethe, H. A.

H. A. Bethe and E. Salpeter, Ref. 1, Vol. 35.

Beutler, H.

H. Beutler, Z. Physik 93, 177 (1935).

Codling, K.

R. P. Madden and K. Codling, Phys. Rev. Letters 10, 516 (1963).

Cook, G. R.

G. R. Cook and P. Metzger (unpublished).

G. R. Cook and P. Metzger, J. Chem. Phys. (to be published).

Cooper, J. W.

J. W. Cooper, Phys. Rev. 128, 681 (1962).

Dalgarno, A.

A. Dalgarno, Proc. Phys. Soc. (London) A65, 663 (1952).

Ditchburn, R. W.

R. W. Ditchburn, Proc. Roy. Soc. (London) A229, 44 (1955).

Duncan, A. B. F.

G. Moe and A. B. F. Duncan, J. Am. Chem. Soc. 74, 3140 (1952).

Garton, W. R. S.

A. Pery-Thorne and W. R. S. Garton, Proc. Phys. Soc. (London) B76, 833 (1960).

Huffman, R. E.

R. E. Huffman, Y. Tanaka, and J. C. Larrabee, J. Chem. Phys. 39, 902 (1963).

Y. Tanaka, R. E. Huffman, and J. C. Larrabee, J. Opt. Soc. Am. 51, 693 (1961); see also Ref. 3, above, and Appl. Opt. 2, 617 (1963).

Inn, E. C. Y.

K. Watanabe, M. Zelikoff, and E. C. Y. Inn, AFCRC Tech. Rept. No. 53–23 Geophys. Res. Paper No. 21 (1953).

Johnston, H. L.

P. G. Wilkinson and H. L. Johnston, J. Chem. Phys. 18, 190 (1950).

Larrabee, J. C.

R. E. Huffman, Y. Tanaka, and J. C. Larrabee, J. Chem. Phys. 39, 902 (1963).

Y. Tanaka, R. E. Huffman, and J. C. Larrabee, J. Opt. Soc. Am. 51, 693 (1961); see also Ref. 3, above, and Appl. Opt. 2, 617 (1963).

Lee, P.

P. Lee and G. L. Weissler, Phys. Rev. 99, 540 (1955).

Madden, R. P.

R. P. Madden and K. Codling, Phys. Rev. Letters 10, 516 (1963).

Metzger, P.

G. R. Cook and P. Metzger (unpublished).

G. R. Cook and P. Metzger, J. Chem. Phys. (to be published).

Moe, G.

G. Moe and A. B. F. Duncan, J. Am. Chem. Soc. 74, 3140 (1952).

Pery-Thorne, A.

A. Pery-Thorne and W. R. S. Garton, Proc. Phys. Soc. (London) B76, 833 (1960).

Salpeter, E.

H. A. Bethe and E. Salpeter, Ref. 1, Vol. 35.

Samson, J. A. R.

J. A. R. Samson, Phys. Rev. 132, 2122 (1963).

Sun, H.

H. Sun and G. L. Weissler, J. Chem. Phys. 23, 1160 (1955).

Tanaka, Y.

Y. Tanaka, R. E. Huffman, and J. C. Larrabee, J. Opt. Soc. Am. 51, 693 (1961); see also Ref. 3, above, and Appl. Opt. 2, 617 (1963).

R. E. Huffman, Y. Tanaka, and J. C. Larrabee, J. Chem. Phys. 39, 902 (1963).

Wainfan, N.

N. Wainfan, W. C. Walker, and G. L. Weissler, Phys. Rev. 99, 542 (1955).

Walker, W. C.

N. Wainfan, W. C. Walker, and G. L. Weissler, Phys. Rev. 99, 542 (1955).

Watanabe, K.

K. Watanabe, Advan. Geophys. 5, 153 (1958).

K. Watanabe, M. Zelikoff, and E. C. Y. Inn, AFCRC Tech. Rept. No. 53–23 Geophys. Res. Paper No. 21 (1953).

Weissler, G. L.

H. Sun and G. L. Weissler, J. Chem. Phys. 23, 1160 (1955).

G. L. Weissler, Handbuch der Physik, edited by S. Flügge (Springer-Verlag, Berlin, 1956), Vol. 21.

P. Lee and G. L. Weissler, Phys. Rev. 99, 540 (1955).

N. Wainfan, W. C. Walker, and G. L. Weissler, Phys. Rev. 99, 542 (1955).

Wilkinson, P. G.

P. G. Wilkinson and H. L. Johnston, J. Chem. Phys. 18, 190 (1950).

Zelikoff, M.

K. Watanabe, M. Zelikoff, and E. C. Y. Inn, AFCRC Tech. Rept. No. 53–23 Geophys. Res. Paper No. 21 (1953).

Other (21)

G. L. Weissler, Handbuch der Physik, edited by S. Flügge (Springer-Verlag, Berlin, 1956), Vol. 21.

K. Watanabe, Advan. Geophys. 5, 153 (1958).

J. Quant. Spectry. Radiative Transfer 2, 375 (1962).

H. Beutler, Z. Physik 93, 177 (1935).

A. Pery-Thorne and W. R. S. Garton, Proc. Phys. Soc. (London) B76, 833 (1960).

R. P. Madden and K. Codling, Phys. Rev. Letters 10, 516 (1963).

P. Lee and G. L. Weissler, Phys. Rev. 99, 540 (1955).

N. Wainfan, W. C. Walker, and G. L. Weissler, Phys. Rev. 99, 542 (1955).

Y. Tanaka, R. E. Huffman, and J. C. Larrabee, J. Opt. Soc. Am. 51, 693 (1961); see also Ref. 3, above, and Appl. Opt. 2, 617 (1963).

G. R. Cook and P. Metzger (unpublished).

R. E. Huffman, Y. Tanaka, and J. C. Larrabee, J. Chem. Phys. 39, 902 (1963).

J. A. R. Samson, Phys. Rev. 132, 2122 (1963).

A. Dalgarno, Proc. Phys. Soc. (London) A65, 663 (1952).

J. W. Cooper, Phys. Rev. 128, 681 (1962).

P. G. Wilkinson and H. L. Johnston, J. Chem. Phys. 18, 190 (1950).

G. Moe and A. B. F. Duncan, J. Am. Chem. Soc. 74, 3140 (1952).

K. Watanabe, M. Zelikoff, and E. C. Y. Inn, AFCRC Tech. Rept. No. 53–23 Geophys. Res. Paper No. 21 (1953).

R. W. Ditchburn, Proc. Roy. Soc. (London) A229, 44 (1955).

H. Sun and G. L. Weissler, J. Chem. Phys. 23, 1160 (1955).

G. R. Cook and P. Metzger, J. Chem. Phys. (to be published).

H. A. Bethe and E. Salpeter, Ref. 1, Vol. 35.

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