Abstract

The electron-excitation, phase-shift method of Lawrence has been applied to the determination of radiative lifetimes of Ar II transitions. The measured levels, which are primarily those of 4<i>p</i><sup>2</sup><i>S</i>, <sup>2</sup><i>P</i>, <sup>4</sup><i>D</i>, were studied using transitions in the region from 1900–4500 Å. The Ar II lifetimes measured ranged from 1.2 to 10.6 nsec and involve a number of levels in which configuration interaction is present.

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  1. G. M. Lawrence, J. Quant. Spectry Radiative Transfer 5, 359 (1965).
  2. G. M. Lawrence and B. D. Savage, Phys. Rev. 141, 67 (1966).
  3. B. D. Savage and G. M. Lawrence, Astrophys. J. 146, 940 (1966).
  4. J. E. Hesser, J. Chem. Phys. 48, 2518 (1968).
  5. J. E. Hesser, Phys. Rev. 174, 68 (1968).
  6. D. Robinson and P. D. Lenn, Appl. Opt. 6, 983 (1967).
  7. D. R. Bates and Damgaard, Phil. Trans. Roy. Soc. (London) A242, 101 (1949).
  8. The 2891 Å line was selected initially for use as a possible phase reference because of its small phase shifts at both low and high modulation frequencies, which was a good indication that the line was cascade free and short lived; the detailed comparison with Ne II 1908–1935 Å confirmed these preliminary findings.
  9. J. Z. Klose, (1968, private communication).
  10. K. W. Meissner, Z. Physik 39, 172 (1926).
  11. T. L. de Bruin, Z. Physik 61, 307 (1930).
  12. C. E. Moore, Contributions from Princeton University Observatory No. 20 (1945).
  13. C. E. Moore, Natl. Bur. Std. (U. S.) Circular 488 (U. S. Gov't. Printing Office, Washington, D. C., 1950), Sec. I.
  14. These lifetimes represent the average of lifetimes derived from 2891 and 2979 Å, whose individual τ's were found to be 4.0 and 4.1 nsec, respectively.
  15. H. N. Olsen, J. Quant. Spectry Radiative Transfer 3, 305 (1963).
  16. C. H. Popenoe and J. B. Shumaker, Jr., J. Res. Natl. Bur. Std. (U. S.) 69A, 495 (1963).
  17. R. H. Garstang, Mon. Not. Roy. Astron. Soc. 114, 118 (1954).
  18. W. R. Bennett, Jr., P. J. Kindlmann, G. N. Mercer, and J. Sunderland, Appl. Phys. Letters 5, 158 (1964).
  19. E. U. Condon and G. H. Shortley, Theory of Atomic Spectra (Cambridge University Press, Cambridge, 1935), p. 375.

Bates, D. R.

D. R. Bates and Damgaard, Phil. Trans. Roy. Soc. (London) A242, 101 (1949).

Bennett, Jr., W. R.

W. R. Bennett, Jr., P. J. Kindlmann, G. N. Mercer, and J. Sunderland, Appl. Phys. Letters 5, 158 (1964).

Condon, E. U.

E. U. Condon and G. H. Shortley, Theory of Atomic Spectra (Cambridge University Press, Cambridge, 1935), p. 375.

de Bruin, T. L.

T. L. de Bruin, Z. Physik 61, 307 (1930).

Garstang, R. H.

R. H. Garstang, Mon. Not. Roy. Astron. Soc. 114, 118 (1954).

Hesser, J. E.

J. E. Hesser, J. Chem. Phys. 48, 2518 (1968).

J. E. Hesser, Phys. Rev. 174, 68 (1968).

Kindlmann, P. J.

W. R. Bennett, Jr., P. J. Kindlmann, G. N. Mercer, and J. Sunderland, Appl. Phys. Letters 5, 158 (1964).

Klose, J. Z.

J. Z. Klose, (1968, private communication).

Lawrence, G. M.

G. M. Lawrence, J. Quant. Spectry Radiative Transfer 5, 359 (1965).

G. M. Lawrence and B. D. Savage, Phys. Rev. 141, 67 (1966).

B. D. Savage and G. M. Lawrence, Astrophys. J. 146, 940 (1966).

Lenn, P. D.

D. Robinson and P. D. Lenn, Appl. Opt. 6, 983 (1967).

Meissner, K. W.

K. W. Meissner, Z. Physik 39, 172 (1926).

Mercer, G. N.

W. R. Bennett, Jr., P. J. Kindlmann, G. N. Mercer, and J. Sunderland, Appl. Phys. Letters 5, 158 (1964).

Moore, C. E.

C. E. Moore, Contributions from Princeton University Observatory No. 20 (1945).

C. E. Moore, Natl. Bur. Std. (U. S.) Circular 488 (U. S. Gov't. Printing Office, Washington, D. C., 1950), Sec. I.

Olsen, H. N.

H. N. Olsen, J. Quant. Spectry Radiative Transfer 3, 305 (1963).

Popenoe, C. H.

C. H. Popenoe and J. B. Shumaker, Jr., J. Res. Natl. Bur. Std. (U. S.) 69A, 495 (1963).

Robinson, D.

D. Robinson and P. D. Lenn, Appl. Opt. 6, 983 (1967).

Savage, B. D.

G. M. Lawrence and B. D. Savage, Phys. Rev. 141, 67 (1966).

B. D. Savage and G. M. Lawrence, Astrophys. J. 146, 940 (1966).

Shortley, G. H.

E. U. Condon and G. H. Shortley, Theory of Atomic Spectra (Cambridge University Press, Cambridge, 1935), p. 375.

Shumaker, Jr., J. B.

C. H. Popenoe and J. B. Shumaker, Jr., J. Res. Natl. Bur. Std. (U. S.) 69A, 495 (1963).

Sunderland, J.

W. R. Bennett, Jr., P. J. Kindlmann, G. N. Mercer, and J. Sunderland, Appl. Phys. Letters 5, 158 (1964).

Other (19)

G. M. Lawrence, J. Quant. Spectry Radiative Transfer 5, 359 (1965).

G. M. Lawrence and B. D. Savage, Phys. Rev. 141, 67 (1966).

B. D. Savage and G. M. Lawrence, Astrophys. J. 146, 940 (1966).

J. E. Hesser, J. Chem. Phys. 48, 2518 (1968).

J. E. Hesser, Phys. Rev. 174, 68 (1968).

D. Robinson and P. D. Lenn, Appl. Opt. 6, 983 (1967).

D. R. Bates and Damgaard, Phil. Trans. Roy. Soc. (London) A242, 101 (1949).

The 2891 Å line was selected initially for use as a possible phase reference because of its small phase shifts at both low and high modulation frequencies, which was a good indication that the line was cascade free and short lived; the detailed comparison with Ne II 1908–1935 Å confirmed these preliminary findings.

J. Z. Klose, (1968, private communication).

K. W. Meissner, Z. Physik 39, 172 (1926).

T. L. de Bruin, Z. Physik 61, 307 (1930).

C. E. Moore, Contributions from Princeton University Observatory No. 20 (1945).

C. E. Moore, Natl. Bur. Std. (U. S.) Circular 488 (U. S. Gov't. Printing Office, Washington, D. C., 1950), Sec. I.

These lifetimes represent the average of lifetimes derived from 2891 and 2979 Å, whose individual τ's were found to be 4.0 and 4.1 nsec, respectively.

H. N. Olsen, J. Quant. Spectry Radiative Transfer 3, 305 (1963).

C. H. Popenoe and J. B. Shumaker, Jr., J. Res. Natl. Bur. Std. (U. S.) 69A, 495 (1963).

R. H. Garstang, Mon. Not. Roy. Astron. Soc. 114, 118 (1954).

W. R. Bennett, Jr., P. J. Kindlmann, G. N. Mercer, and J. Sunderland, Appl. Phys. Letters 5, 158 (1964).

E. U. Condon and G. H. Shortley, Theory of Atomic Spectra (Cambridge University Press, Cambridge, 1935), p. 375.

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