Lifetime of a Negative Helium Ion

D. J. Nicholas; C. W. Trowbridge; W. D. Allen

doi:10.1103/PhysRev.167.38

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Lifetime of a Negative Helium Ion

D. J. Nicholas, C. W. Trowbridge, and W. D. Allen

Rutherford High Energy Laboratory, Chilton, Didcot, Berkshire, England

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Phys. Rev. 167, 38 – Published 5 March, 1968

DOI: https://doi.org/10.1103/PhysRev.167.38

Abstract

The lifetime of a negative ion of helium produced from ${He}^{+}$ by charge exchange in helium gas is measured and found to be 18.2±2.7 μsec. This is consistent with the lower limit of 10 μsec previously determined. Total loss cross-section measurements in the energy range 20-70 keV are reported and compared with a previous published value at 17.5 keV. An investigation is also made of the destruction of the negative ions by thermal photons; this is found to be negligible at the temperatures involved, enabling an upper limit of 2.0× $10^{- 15}$ ${cm}^{2}$ to be set on the photodetachment cross section of ${He}^{-}$ .

References (16)

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[c1] J. W. Hiby, Ann. Physik 34, 473 (1939)

[c2] B. L. Donnally and G. Thoeming, Phys. Rev. 159, 87 (1967)

[c3] Ta-You Wu, Phil. Mag. 22, 837 (1936)

[c4] E. Holøien, Arch. Math. Nature 51, 81 (1951)

[c5] E. Holøien and J. Midtal, Proc. Phys. Soc. (London) A68, 815 (1955)

[c6] A. G. Riviere and D. R. Sweetman, Phys. Rev. Letters 5, 560 (1960)

[c7] B. M. Smirnov and M. I. Chibisov, Zh. Eksperim. i Teor. Fiz. 49, 841 (1966) [English transl.: Soviet Phys.—JETP 22, 585 (1966)]

[c8] J. L. Pietenpol, Phys. Rev. Letters 7, 64 (1961)

[c9] C. Laughlin and A. L. Stewart, Proc. Phys. Soc. (London) A88, 893 (1966)

[c10] B. W. Ridley, Nucl. Instr. Methods 14, 231 (1962)

[c11] P. M. Stier, C. F. Barnett, and G. E. Evans, Phys. Rev. 96, 973 (1954)

[c12] P. M. Windham et al., Phys. Rev. 109, 1193 (1954)

[c13] L. M. Branscomb and S. J. Smith, Phys. Rev. 98, 1028 (1955)

[c14] D. R. Sweetman, Proc. Phys. Soc. (London) 76, 998 (1960)

[c15] G. J. Schulz, Phys. Rev. Letters 10, 104 (1963)

[c16] C. E. Kuyatt, J. A. Simpson, and S. R. Mielczarek, Phys. Rev. 138, A385 (1965)

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Lifetime of a Negative Helium Ion

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