Abstract

<p>The function for the excitation of the helium 3<sup>1</sup><i>P</i> level by electron impact has been determined optically. Light intensity of the 3<sup>1</sup><i>P</i> → 2<sup>1</sup><i>S</i> transition (5016 A) was detected by a sensitive photomultiplier; its output was measured by a microammeter.</p><p>The intensity of the 5016 A line was proportional to electron beam current for all currents used and proportional to helium pressure for less than 3 × 10<sup>-4</sup> mm. Above 3 × 10<sup>-4</sup> mm pressure imprisonment of resonance radiation enhanced the light intensity.</p><p>The excitation function has a peak value of 2.4 × 10<sup>-18</sup> cm<sup>2</sup>; this occurs at an electron energy of 100 ev. Absolute determination of the cross section was possible through the calibration of the light detection system by a tungsten ribbon standard lamp. The experimental curve is corrected by removing cascade components from it.</p>

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  2. O. Thieme, Z. Physik 78, 412 (1932).
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  13. Heron, McWhirler, and Roderick, Proc. Roy. Soc. (London) A234, 565 (1956).
  14. J. H. Lees and H. W. B. Skinner, Proc. Roy. Soc. (London) A137, 186 (1932).

Bates, D. R.

D. R. Bates et al., Trans. Roy. Soc. (London) A243, 93 (1950).

De Vos, J. C.

J. C. De Vos, Physica 20, 715 (1954).

Dorrestein, R.

R. Dorrestein, Physica 9, 477 (1942).

Fox, R. E.

G. J. Schulz and R. E. Fox, Phys. Rev. 106, 1179 (1957).

Hanle, W.

W. Hanle, Z. Physik 56, 94 (1929).

Lees, J. H.

J. H. Lees, Proc. Roy. Soc. (London) A137, 173 (1932).

J. H. Lees and H. W. B. Skinner, Proc. Roy. Soc. (London) A137, 186 (1932).

Maier-Leibnitz, H.

H. Maier-Leibnitz, Z. Physik 95, 499 (1935).

Massey, H. S. W.

H. S. W. Massey, Handbuch für Physik (Springer-Verlag, Berlin, 1956), Vol. 36, p. 307.

Phelps, A. V.

A. V. Phelps, Phys. Rev. 110, 1362 (1958).

Schulz, G. J.

G. J. Schulz and R. E. Fox, Phys. Rev. 106, 1179 (1957).

Skinner, H. W. B.

J. H. Lees and H. W. B. Skinner, Proc. Roy. Soc. (London) A137, 186 (1932).

Thieme, O.

O. Thieme, Z. Physik 78, 412 (1932).

Other (14)

J. H. Lees, Proc. Roy. Soc. (London) A137, 173 (1932).

O. Thieme, Z. Physik 78, 412 (1932).

W. Hanle, Z. Physik 56, 94 (1929).

H. Maier-Leibnitz, Z. Physik 95, 499 (1935).

R. Dorrestein, Physica 9, 477 (1942).

G. J. Schulz and R. E. Fox, Phys. Rev. 106, 1179 (1957).

H. S. W. Massey, Handbuch für Physik (Springer-Verlag, Berlin, 1956), Vol. 36, p. 307.

A. V. Phelps, Phys. Rev. 110, 1362 (1958).

Bronco, St. John, and Fowler, Rev. Sci. Instr. 29, 1145 (1958).

D. R. Bates et al., Trans. Roy. Soc. (London) A243, 93 (1950).

J. C. De Vos, Physica 20, 715 (1954).

Landolt-Bornstein, Tables (Springer-Verlag, Berlin, 1950), Vol. I, Part 1, p. 262.

Heron, McWhirler, and Roderick, Proc. Roy. Soc. (London) A234, 565 (1956).

J. H. Lees and H. W. B. Skinner, Proc. Roy. Soc. (London) A137, 186 (1932).

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