Abstract

The function for the excitation of the helium 31P level by electron impact has been determined optically. Light intensity of the 31P→21S transition (5016 A) was detected by a sensitive photomultiplier; its output was measured by a microammeter.

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 3×10−4 mm. Above 3×10−4 mm pressure imprisonment of resonance radiation enhanced the light intensity.

The excitation function has a peak value of 2.4×10−18 cm2; 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.

© 1960 Optical Society of America

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References

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  1. J. H. Lees, Proc. Roy. Soc. (London) A137, 173 (1932).
  2. O. Thieme, Z. Physik 78, 412 (1932).
    [Crossref]
  3. W. Hanle, Z. Physik 56, 94 (1929).
    [Crossref]
  4. H. Maier-Leibnitz, Z. Physik 95, 499 (1935).
    [Crossref]
  5. R. Dorrestein, Physica 9, 477 (1942).
  6. G. J. Schulz and R. E. Fox, Phys. Rev. 106, 1179 (1957).
    [Crossref]
  7. H. S. W. Massey, Handbuch für Physik (Springer-Verlag, Berlin, 1956), Vol. 36, p. 307.
  8. A. V. Phelps, Phys. Rev. 110, 1362 (1958).
    [Crossref]
  9. Bronco, St. John, and Fowler, Rev. Sci. Instr. Sci. Instr. 29, 1145 (1958).
    [Crossref]
  10. D. R. Bates and et al., Trans. Roy. Soc. (London) A243, 93 (1950).
    [Crossref]
  11. J. C. De Vos, Physica 20, 715 (1954).
    [Crossref]
  12. Landolt-Bornstein, Tables (Springer-Verlag, Berlin, 1950), Vol. I, Part 1, p. 262.
  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).

1958 (2)

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

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

1957 (1)

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

1956 (1)

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

1954 (1)

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

1950 (1)

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

1942 (1)

R. Dorrestein, Physica 9, 477 (1942).

1935 (1)

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

1932 (3)

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

O. Thieme, Z. Physik 78, 412 (1932).
[Crossref]

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

1929 (1)

W. Hanle, Z. Physik 56, 94 (1929).
[Crossref]

Bates, D. R.

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

Bronco,

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

De Vos, J. C.

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

Dorrestein, R.

R. Dorrestein, Physica 9, 477 (1942).

Fowler,

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

Fox, R. E.

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

Hanle, W.

W. Hanle, Z. Physik 56, 94 (1929).
[Crossref]

Heron,

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

Lees, J. H.

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

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

Maier-Leibnitz, H.

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

Massey, H. S. W.

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

McWhirler,

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

Phelps, A. V.

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

Roderick,

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

Schulz, G. J.

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

Skinner, H. W. B.

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

St. John,

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

Thieme, O.

O. Thieme, Z. Physik 78, 412 (1932).
[Crossref]

Phys. Rev. (2)

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

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

Physica (2)

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

R. Dorrestein, Physica 9, 477 (1942).

Proc. Roy. Soc. (London) (3)

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).

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

Rev. Sci. Instr. Sci. Instr. (1)

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

Trans. Roy. Soc. (London) (1)

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

Z. Physik (3)

O. Thieme, Z. Physik 78, 412 (1932).
[Crossref]

W. Hanle, Z. Physik 56, 94 (1929).
[Crossref]

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

Other (2)

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

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

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Figures (6)

Fig. 1
Fig. 1

Helium energy-level diagram. Singlets only.

Fig. 2
Fig. 2

Block diagram of excitation chamber and light detection system.

Fig. 3
Fig. 3

Excitation tube showing electron gun, accelerating anodes, and electron collection chamber.

Fig. 4
Fig. 4

Photomultiplier current vs collision chamber current. Constant pressure and electron energy currents in μa.

Fig. 5
Fig. 5

Ratio of photomultiplier current to product of collision chamber current times pressure vs pressure. Constant electron energy.

Fig. 6
Fig. 6

Photomultipler current per unit collision chamber current (relative cross section for excitation to 31P) vs electron energy. Solid curve includes cascading, dashed curve excludes cascading.

Equations (4)

Equations on this page are rendered with MathJax. Learn more.

R 1 = R 0 n Q l ,
R 2 = R 1 + R cas .
R 3 = ( R 3 / R 4 ) ( R 4 / R 5 ) ( R 5 / R 2 ) R 2 .
Q = ( 54.3 R 3 - R cas ) / ( R 0 n l ) .