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 7.3×10−18 cm2. 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 f value of 1.54 is obtained. Applying the Thornas–Kuhn sum rule one therefore obtains the total oscillator strength for all discrete transitions as f = 0.46.

© 1964 Optical Society of America

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References

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  1. J. P. Vinti, Phys. Rev. 44, 524 (1933).
    [Crossref]
  2. J. A. Wheeler, Phys. Rev. 43, 258 (1933).
    [Crossref]
  3. H. Körwien, Z. Physik 91, 1 (1934).
    [Crossref]
  4. S. Huang, Astrophys. J. 108, 354 (1948).
    [Crossref]
  5. A. Dalgarno and N. Lynn, Proc. Phys. Soc. (London) 70, 802 (1957).
    [Crossref]
  6. A. Dalgarno and A. L. Stewart, Proc. Phys. Soc. (London) 76, 49 (1960).
    [Crossref]
  7. E. E. Salpeter and M. H. Zaidi, Phys. Rev. 125, 248 (1962).
    [Crossref]
  8. A. L. Stewart and W. J. Wilkinson, Proc. Phys. Soc. (London) 75, 796 (1960).
    [Crossref]
  9. A. L. Stewart and T. G. Webb, Proc. Phys. Soc. (London) 82, 532 (1963).
    [Crossref]
  10. J. W. Cooper, Phys. Rev. 128, 681 (1962).
    [Crossref]
  11. Po Lee and G. L. Weissler, Phys. Rev. 99, 540 (1955).
    [Crossref]
  12. N. Axelrod and M. P. Givens, Phys. Rev. 115, 97 (1959).
    [Crossref]
  13. D. J. Baker, D. E. Bedo, and D. H. Tomboulian, Phys. Rev. 124, 1471 (1961).
    [Crossref]
  14. J. A. R. Samson, J. Opt. Soc. Am. 54, 6 (1964).
    [Crossref]
  15. R. Madden and K. Codling, Phys. Rev. Letters 10, 516 (1963).
    [Crossref]
  16. J. F. Lowry and D. H. Tomboulian, Tech. Rept. No. 3, ARO (D) Project No. 2810P (September1963).
  17. S. J. M. Allen, as compiled in A. H. Compton and S. K. Allison, X-Rays in Theory and Experiment (D. Van Nostrand Company, Inc., New York, 1935), p. 799.
  18. B. L. Henke, J. Appl. Phys. 28, 98 (1957).
    [Crossref]
  19. J. A. Victoreen, J. Appl. Phys. 20, 1141 (1949).
    [Crossref]
  20. J. P. Vinti, Phys. Rev. 42, 632 (1932).
    [Crossref]
  21. E. A. Hylleraas, Z. Physik 106, 395 (1937).
    [Crossref]
  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).

1964 (1)

1963 (2)

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

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

1962 (2)

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

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

1961 (1)

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

1960 (2)

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

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

1959 (1)

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

1957 (3)

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

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

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

1955 (1)

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

1949 (1)

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

1948 (1)

S. Huang, Astrophys. J. 108, 354 (1948).
[Crossref]

1937 (1)

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

1934 (1)

H. Körwien, Z. Physik 91, 1 (1934).
[Crossref]

1933 (2)

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

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

1932 (1)

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

Allen, S. J. M.

S. J. M. Allen, as compiled in A. 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).
[Crossref]

Baker, D. J.

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

Bedo, D. E.

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

Codling, K.

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

Cooper, J. W.

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

Dalgarno, A.

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

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

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).
[Crossref]

Hargreaves, J.

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

Henke, B. L.

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

Huang, S.

S. Huang, Astrophys. J. 108, 354 (1948).
[Crossref]

Hylleraas, E. A.

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

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).
[Crossref]

Lee, Po

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

Lowry, J. F.

J. F. Lowry and D. H. Tomboulian, Tech. Rept. No. 3, ARO (D) Project No. 2810P (September1963).

Lynn, N.

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

Madden, R.

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

Salpeter, E. E.

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

Samson, J. A. R.

Schulter, A.

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

Stewart, A. L.

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

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

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

Tomboulian, D. H.

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

J. F. Lowry and D. H. Tomboulian, Tech. Rept. No. 3, ARO (D) Project No. 2810P (September1963).

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).
[Crossref]

Vinti, J. P.

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

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

Webb, T. G.

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

Weissler, G. L.

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

Wheeler, J. A.

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

Wilkinson, W. J.

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

Zaidi, M. H.

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

Astrophys. J. (1)

S. Huang, Astrophys. J. 108, 354 (1948).
[Crossref]

J. Appl. Phys. (2)

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

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

J. Opt. Soc. Am. (1)

Phys. Rev. (8)

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

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

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

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

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

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

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

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

Phys. Rev. Letters (1)

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

Proc. Cambridge Phil. Soc. (1)

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

Proc. Phys. Soc. (London) (4)

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

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

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

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

Z. Astrophysik (1)

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

Z. Physik (2)

H. Körwien, Z. Physik 91, 1 (1934).
[Crossref]

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

Other (2)

J. F. Lowry and D. H. Tomboulian, Tech. Rept. No. 3, ARO (D) Project No. 2810P (September1963).

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

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Figures (2)

F. 1
F. 1

Experimental arrangement of light source, vacuum monochromator, and absorption cell. The absorption cell is in fact a double ion chamber.

F. 2
F. 2

Experimental photoionization cross sections of helium compared to theoretical values. The vertical lines indicate the position of discrete absorption lines observed by Madden and Codling. Squares, Stewart & Webb (dipole length); open circles, Stewart & Webb (dipole velocity); large dots, present data; small dots, Lowry & Tomboulian. Broken curve, Cooper; solid curve, present data.

Tables (1)

Tables Icon

Table I Helium f values for the transition 11S–n1P as obtained from the relation f = C/n3.

Equations (1)

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f = m c 2 e 2 π n 0 k ( ν ) d ν ,