Abstract

<p>Recent absolute measurements of many helium excitation functions at low pressure and of the singlet and triplet D functions at several pressures have allowed an extension and upgrading of the multiple-state-transfer process.</p><p>Atoms excited to an <i>n</i><sup>1</sup>P level are converted to a mixed singlet-triplet F state by an atomic collision. Low-lying singlet and triplet <i>D</i> levels are fed by the many F states thus populated.</p><p>Apparent excitation functions were computed by machine for the 3<sup>3</sup><i>D</i>, 4<sup>3</sup>D, and 4<sup>1</sup><i>D</i> states and compared with the experimental excitation functions. The computed curves best match the experimental curves when it is assumed that: (a) the transfer cross section for the nth set of <sup>1</sup>P-F states is proportional to <i>n</i><sup>1</sup> or <i>n</i><sup>2</sup>, and (b) the <sup>1</sup>F<sub>3</sub> and <sup>3</sup>F<sub>3</sub> components of the mixed state are active in the transfer—cascade processes, while the <sup>3</sup>F<sub>2</sub>, <sub>4</sub> states are inactive.</p><p>The energy is primarily transferred through <i>n</i><sup>1</sup>P–nF sets of states with <i>n</i> ≤ 15.</p>

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  1. E . Wigner, Nachr. Ges. Wiss. Göttingen, Jahresber, Geschäftsjahr, 375 (1927).
  2. R. M. St. John and R. G. Fowler, Phys. Rev. 122, 1813 (1961).
  3. C. C. Lin and R. G. Fowler, Ann. Phys. (New York) 15, 461 (1961).
  4. C. C. Lin and R. M. St. John, Phys. Rev. 128, 1749 (1962).
  5. R. M. St. John, F. L. Miller, and C. C. Lin, Phys. Rev. 134, A888 (1964).
  6. A. V. Phelps, Phys. Rev. 110, 1362 (1958).
  7. A. H. Gabriel and D. W. O. Heddle, Proc. Roy. Soc. (London) A258, 124 (1960).
  8. H. S. W. Massey and C. B. O. Mohr, Proc. Roy. Soc. (London) A140, 613 (1933).
  9. The calculated curves for x = 3 and 4 lay between those of x = 2 and x = 5 for the 33D case, and for 43D, 41D, and 31D cases as well. Since the graphs of the functions for x = 1, 2, and 5 show the trend of the variation of the calculated excitation functions, the graphs of the functions for x = 3 and 4 are omitted for the sake of clarity of the figures.

Fowler, R. G.

C. C. Lin and R. G. Fowler, Ann. Phys. (New York) 15, 461 (1961).

R. M. St. John and R. G. Fowler, Phys. Rev. 122, 1813 (1961).

Gabriel, A. H.

A. H. Gabriel and D. W. O. Heddle, Proc. Roy. Soc. (London) A258, 124 (1960).

Heddle, D. W. O.

A. H. Gabriel and D. W. O. Heddle, Proc. Roy. Soc. (London) A258, 124 (1960).

John, R. M. St.

C. C. Lin and R. M. St. John, Phys. Rev. 128, 1749 (1962).

R. M. St. John and R. G. Fowler, Phys. Rev. 122, 1813 (1961).

R. M. St. John, F. L. Miller, and C. C. Lin, Phys. Rev. 134, A888 (1964).

Lin, C. C.

R. M. St. John, F. L. Miller, and C. C. Lin, Phys. Rev. 134, A888 (1964).

C. C. Lin and R. G. Fowler, Ann. Phys. (New York) 15, 461 (1961).

C. C. Lin and R. M. St. John, Phys. Rev. 128, 1749 (1962).

Massey, H. S. W.

H. S. W. Massey and C. B. O. Mohr, Proc. Roy. Soc. (London) A140, 613 (1933).

Miller, F. L.

R. M. St. John, F. L. Miller, and C. C. Lin, Phys. Rev. 134, A888 (1964).

Mohr, C. B. O.

H. S. W. Massey and C. B. O. Mohr, Proc. Roy. Soc. (London) A140, 613 (1933).

Phelps, A. V.

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

Wigner, E .

E . Wigner, Nachr. Ges. Wiss. Göttingen, Jahresber, Geschäftsjahr, 375 (1927).

Other (9)

E . Wigner, Nachr. Ges. Wiss. Göttingen, Jahresber, Geschäftsjahr, 375 (1927).

R. M. St. John and R. G. Fowler, Phys. Rev. 122, 1813 (1961).

C. C. Lin and R. G. Fowler, Ann. Phys. (New York) 15, 461 (1961).

C. C. Lin and R. M. St. John, Phys. Rev. 128, 1749 (1962).

R. M. St. John, F. L. Miller, and C. C. Lin, Phys. Rev. 134, A888 (1964).

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

A. H. Gabriel and D. W. O. Heddle, Proc. Roy. Soc. (London) A258, 124 (1960).

H. S. W. Massey and C. B. O. Mohr, Proc. Roy. Soc. (London) A140, 613 (1933).

The calculated curves for x = 3 and 4 lay between those of x = 2 and x = 5 for the 33D case, and for 43D, 41D, and 31D cases as well. Since the graphs of the functions for x = 1, 2, and 5 show the trend of the variation of the calculated excitation functions, the graphs of the functions for x = 3 and 4 are omitted for the sake of clarity of the figures.

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