Abstract

The photoionization cross sections of helium have been measured from threshold down to 260 Å. At the spectral head the cross section is found to be 7.3×10<sup>-18</sup> cm<sup>2</sup>. The experimental results are compared to available theoretical data. The oscillator strength for transitions into the ionization continuum have been estimated from threshold to 0.01 Å using the present and previously published data. A continuum <i>ʃ</i> value of 1.54 is obtained. Applying the Thomas-Kuhn sum rule one therefore obtains the total oscillator strength for all discrete transitions as <i>ʃ</i>= 0.46.

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  1. J. P. Vinti, Phys. Rev. 44, 524 (1933).
  2. J. A. Wheeler, Phys. Rev. 43, 258 (1933).
  3. H. Körwien, Z. Physik 91, 1 (1934).
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  5. A. Dalgarno and N. Lynn, Proc. Phys. Soc. (London) 70, 802 (1957).
  6. A. Dalgarno and A. L. Stewart, Proc. Phys. Soc. (London) 76, 49 (1960).
  7. E. E. Salpeter and M. H. Zaidi, Phys. Rev. 125, 248 (1962).
  8. A. L. Stewart and W. J. Wilkinson, Proc. Phys. Soc. (London) 75, 796 (1960).
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  11. Po Lee and G. L. Weissler, Phys. Rev. 99, 540 (1955).
  12. N. Axelrod and M. P. Givens, Phys. Rev. 115, 97 (1959).
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  19. J. A. Victoreen, J. Appl. Phys. 20, 1141 (1949).
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  21. E. A. Hylleraas, Z. Physik 106, 395 (1937).
  22. E. Trefftz, A. Schulter, K. H. Dettmar, and K. Jorgens, Z. Astrophysik 44, 1 (1957).
  23. J. Hargreaves, Proc. Cambridge Phil. Soc. 25, 91 (1928–1929).

Allen, S. J. M.

S. J. M. Allen, as compiled inA. H. Compton and S. K Allison, X-Rays in Theory and Experiment (D. Van Nostrand Company, Inc., New York, 1935), p. 799.

Allison, S. K

S. J. M. Allen, as compiled inA. H. Compton and S. K Allison, X-Rays in Theory and Experiment (D. Van Nostrand Company, Inc., New York, 1935), p. 799.

Axelrod, N.

N. Axelrod and M. P. Givens, Phys. Rev. 115, 97 (1959).

Baker, D. J.

D. J. Baker, D. E. Bedo, and D. H. Tomboulian, Phys. Rev. 124, 1471 (1961).

Bedo, D. E.

D. J. Baker, D. E. Bedo, and D. H. Tomboulian, Phys. Rev. 124, 1471 (1961).

Codling, K.

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

Compton, A. H.

S. J. M. Allen, as compiled inA. H. Compton and S. K Allison, X-Rays in Theory and Experiment (D. Van Nostrand Company, Inc., New York, 1935), p. 799.

Cooper, J. W.

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

Dalgarno, A.

A. Dalgarno and A. L. Stewart, Proc. Phys. Soc. (London) 76, 49 (1960).

A. Dalgarno and N. Lynn, Proc. Phys. Soc. (London) 70, 802 (1957).

Dettmar, K. H.

E. Trefftz, A. Schulter, K. H. Dettmar, and K. Jorgens, Z. Astrophysik 44, 1 (1957).

Givens, M. P.

N. Axelrod and M. P. Givens, Phys. Rev. 115, 97 (1959).

Hargreaves, J.

J. Hargreaves, Proc. Cambridge Phil. Soc. 25, 91 (1928–1929).

Henke, B. L.

B. L. Henke, J. Appl. Phys. 28, 98 (1957).

Huang, S.

S. Huang, Astrophys. J. 108, 354 (1948).

Hylleraas, E. A.

E. A. Hylleraas, Z. Physik 106, 395 (1937).

Jorgens, K.

E. Trefftz, A. Schulter, K. H. Dettmar, and K. Jorgens, Z. Astrophysik 44, 1 (1957).

Körwien, H.

H. Körwien, Z. Physik 91, 1 (1934).

Lee, Po

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

Lowry, J. F.

J. F. Lowry and D. H. Tomboulian, Tech. Rept. No. 3, ARO(D) Project No. 2810P (September 1963).

Lynn, N.

A. Dalgarno and N. Lynn, Proc. Phys. Soc. (London) 70, 802 (1957).

Madden, R.

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

Salpeter, E. E.

E. E. Salpeter and M. H. Zaidi, Phys. Rev. 125, 248 (1962).

Samson, J. A. R.

J. A. R. Samson, J. Opt. Soc. Am. 54, 6 (1964).

Schulter, A.

E. Trefftz, A. Schulter, K. H. Dettmar, and K. Jorgens, Z. Astrophysik 44, 1 (1957).

Stewart, A. L.

A. L. Stewart and W. J. Wilkinson, Proc. Phys. Soc. (London) 75, 796 (1960).

A. L. Stewart and T. G. Webb, Proc. Phys. Soc. (London) 82, 532 (1963).

A. Dalgarno and A. L. Stewart, Proc. Phys. Soc. (London) 76, 49 (1960).

Tomboulian, D. H.

J. F. Lowry and D. H. Tomboulian, Tech. Rept. No. 3, ARO(D) Project No. 2810P (September 1963).

D. J. Baker, D. E. Bedo, and D. H. Tomboulian, Phys. Rev. 124, 1471 (1961).

Trefftz, E.

E. Trefftz, A. Schulter, K. H. Dettmar, and K. Jorgens, Z. Astrophysik 44, 1 (1957).

Victoreen, J. A.

J. A. Victoreen, J. Appl. Phys. 20, 1141 (1949).

Vinti, J. P.

J. P. Vinti, Phys. Rev. 44, 524 (1933).

J. P. Vinti, Phys. Rev. 42, 632 (1932).

Webb, T. G.

A. L. Stewart and T. G. Webb, Proc. Phys. Soc. (London) 82, 532 (1963).

Weissler, G. L.

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

Wheeler, J. A.

J. A. Wheeler, Phys. Rev. 43, 258 (1933).

Wilkinson, W. J.

A. L. Stewart and W. J. Wilkinson, Proc. Phys. Soc. (London) 75, 796 (1960).

Zaidi, M. H.

E. E. Salpeter and M. H. Zaidi, Phys. Rev. 125, 248 (1962).

Other (23)

J. P. Vinti, Phys. Rev. 44, 524 (1933).

J. A. Wheeler, Phys. Rev. 43, 258 (1933).

H. Körwien, Z. Physik 91, 1 (1934).

S. Huang, Astrophys. J. 108, 354 (1948).

A. Dalgarno and N. Lynn, Proc. Phys. Soc. (London) 70, 802 (1957).

A. Dalgarno and A. L. Stewart, Proc. Phys. Soc. (London) 76, 49 (1960).

E. E. Salpeter and M. H. Zaidi, Phys. Rev. 125, 248 (1962).

A. L. Stewart and W. J. Wilkinson, Proc. Phys. Soc. (London) 75, 796 (1960).

A. L. Stewart and T. G. Webb, Proc. Phys. Soc. (London) 82, 532 (1963).

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

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

N. Axelrod and M. P. Givens, Phys. Rev. 115, 97 (1959).

D. J. Baker, D. E. Bedo, and D. H. Tomboulian, Phys. Rev. 124, 1471 (1961).

J. A. R. Samson, J. Opt. Soc. Am. 54, 6 (1964).

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

J. F. Lowry and D. H. Tomboulian, Tech. Rept. No. 3, ARO(D) Project No. 2810P (September 1963).

S. J. M. Allen, as compiled inA. H. Compton and S. K Allison, X-Rays in Theory and Experiment (D. Van Nostrand Company, Inc., New York, 1935), p. 799.

B. L. Henke, J. Appl. Phys. 28, 98 (1957).

J. A. Victoreen, J. Appl. Phys. 20, 1141 (1949).

J. P. Vinti, Phys. Rev. 42, 632 (1932).

E. A. Hylleraas, Z. Physik 106, 395 (1937).

E. Trefftz, A. Schulter, K. H. Dettmar, and K. Jorgens, Z. Astrophysik 44, 1 (1957).

J. Hargreaves, Proc. Cambridge Phil. Soc. 25, 91 (1928–1929).

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