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Electron-Alkali-Metal Inelastic Recoil Experiments with Spin Analysis: Experimental Method and the Small-Angle Behavior of the 4S122→4P12,322 Excitation of Potassium

K. Rubin*, B. Bederson†, M. Goldstein, and R. E. Collins‡

  • New York University, University Heights, New York, New York 10453

  • *Permanent address: Physics Department, City University of New York, 138th Street and Convent Avenue, New York, New York.
  • †Visiting Fellow, 1968-1969, Joint Institute for Laboratory Astrophysics, University of Colorado, Boulder, Colorado 80302.
  • ‡Present address: A. W. A. Physical Laboratory, 348 Victoria Road, Rydalmere, New South Wales, Australia.
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Phys. Rev. 182, 201 – Published 5 June, 1969

DOI: https://doi.org/10.1103/PhysRev.182.201

Abstract

The use of the atom-beam recoil technique in the study of differential inelastic electron-atom collisions with spin analysis is discussed. The general theory of the experimental method is presented. It is shown how to relate the observable R, the fractional depolarization of a polarized atom beam, to the several direct and exchange scattering amplitudes. A linear momentum-transfer analysis, required to connect the atomic and electron scattering angles, is also given. Some observations of the change of spin state of potassium, resulting from small-angle excitations of 4S122→4P12,322 transitions are discussed, and are related to the threshold laws.

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References (10)

  1. Methods of Experimental Physics, edited by B. Bederson and W. L. Fite (Academic Press, Inc., New York 1968) Vol. 7A, pp. 89-95 R. E. Collins, Ph.D. thesis, New York University, 1968 (unpublished) K. Rubin, J. Perel, and B. Bederson, Phys. Rev. 117, 151 (1960) [W. Aberth, G. Sunshine, and B. Bederson, Atomic Collision Processes, edited by M. R. C. McDowell (North-Holland Publishing Co., Amsterdam, 1964) p. 53] [R. H. Neynaber, S. M. Trujillo, L. L. Marino, and E. W. Rothe, Atomic Collision ProcessesNorth-Holland Publishing Co., Amsterdam1964 p. 1089] [G. Sunshine, B. B. Aubrey, and B. Bederson, Phys. Rev. 154, 1 (1967)] Li [J. Perel, P. Englander, and B. Bederson, ibid. 128, 1148 (1962)] R. E. Collins, M. Goldstein, B. Bederson, and K. Rubin, Phys. Rev. Letters 19, 1366, (1967) Phys. Letters, 27A, 440 (1968)

  2. Omitted endnote

  3. M. J. Seaton, in Excitation Electronique d'une Vapeur Atomique (Centre National de la Recherche Scientifique, Paris, 1967), pp. 21-53
  4. R. H. McFarland, in Excitation Electronique d'une Vapeur Atomique (Centre National de la Recherche Scientifique, Paris, 1967), pp. 35-50 B. L. Moiseiwitsch and S. J. Smith, Rev. Mod. Phys. 40, 238 (1968) H. Hafner and H. Kleinpoppen, Z. Physik, 198, 315 (1967)
  5. B. Bederson and K. Rubin, United States Atomic Energy Commission Technical Report NYO 10, 117, 1962 (unpublished) M. A. D. Fluendy, J. Sci. Instr. 42, 489 (1965)
  6. B. Bederson, J. Eisinger, K. Rubin, and A. Salop, Rev. Sci. Instr. 31, 852 (1960)

  7. Omitted endnote

  8. I. P. Zapesochnyi, Teplofizika Vysokikh Temperature 5, 7 (1967) [English transl.: High Temp. USSR 5, 6 (1967)]
  9. M. Goldstein et al., to be published
  10. I. C. Percival and M. J. Seaton, Phil. Trans. Roy. Soc. (London) 113, 251 (1958)

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Phys. Rev. 182, 201– Published 5 June, 1969
  • Received 10 January 1969

© 1969 American Physical Society

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