Abstract

Energy levels for Th I were computed from the weighted averages of wavelengths from seven sets of published interferometrically measured data. The most self-consistent energy levels obtained in this way were then employed to calculate wavenumbers that have a standard deviation of less than 10 mK. We propose that these lines be adopted as class-B secondary standards. Calculated wavelengths of 1375 Th I lines and weighted averages of 181 interferometrically measured Th I and Th II lines between 2565 and 12 381 Å are given.

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  1. W. F. Meggers, Trans. Intern. Astron. Union 9, 225 (1955).
  2. W. F. Meggers and R. W. Stanley, J. Res. Natl. Bur. Std. (U. S.) 61, 95 (1958).
  3. A. Davison, A. Giacchetti, and R. W. Stanley, J. Opt. Soc. Am. 52, 447 (1962).
  4. A. Giacchetti, M. Gallardo, M. J. Garavaglia, Z. Gonzalez, F. P. J. Valero, and E. Zakowicz, J. Opt. Soc. Am. 54, 957 (1964).
  5. W. F. Meggers and R. W. Stanley, J. Res. Natl. Bur. Std. (U. S.) 69A, 109 (1965).
  6. T. A. Littlefield and A. Wood, J. Opt. Soc. Am. 55, 1509 (1965).
  7. F. P. J. Valero, J. Opt. Soc. Am. 58, 484, 1048 (1968).
  8. D. Goorvitch, F. P. J. Valero, and A. L. Clúa, J. Opt. Soc. Am. 59, 971 (1969).
  9. R. Zalubas, J. Opt. Soc. Am. 58, 1195 (1968).
  10. L. J. Radziemski. Jr. (private communication). This program was developed by Radziemski, K. L. Andrew, and his students.
  11. T. A. Littlefield, Trans. Intern. Astron. Union 11B, 212 (1961).
  12. E. B. M. Steers, Spectrochem. Acta 23B, 135 (1967).

Clúa, A. L.

D. Goorvitch, F. P. J. Valero, and A. L. Clúa, J. Opt. Soc. Am. 59, 971 (1969).

Davison, A.

A. Davison, A. Giacchetti, and R. W. Stanley, J. Opt. Soc. Am. 52, 447 (1962).

Gallardo, M.

A. Giacchetti, M. Gallardo, M. J. Garavaglia, Z. Gonzalez, F. P. J. Valero, and E. Zakowicz, J. Opt. Soc. Am. 54, 957 (1964).

Garavaglia, M. J.

A. Giacchetti, M. Gallardo, M. J. Garavaglia, Z. Gonzalez, F. P. J. Valero, and E. Zakowicz, J. Opt. Soc. Am. 54, 957 (1964).

Giacchetti, A.

A. Davison, A. Giacchetti, and R. W. Stanley, J. Opt. Soc. Am. 52, 447 (1962).

A. Giacchetti, M. Gallardo, M. J. Garavaglia, Z. Gonzalez, F. P. J. Valero, and E. Zakowicz, J. Opt. Soc. Am. 54, 957 (1964).

Gonzalez, Z.

A. Giacchetti, M. Gallardo, M. J. Garavaglia, Z. Gonzalez, F. P. J. Valero, and E. Zakowicz, J. Opt. Soc. Am. 54, 957 (1964).

Goorvitch, D.

D. Goorvitch, F. P. J. Valero, and A. L. Clúa, J. Opt. Soc. Am. 59, 971 (1969).

Littlefield, T. A.

T. A. Littlefield and A. Wood, J. Opt. Soc. Am. 55, 1509 (1965).

T. A. Littlefield, Trans. Intern. Astron. Union 11B, 212 (1961).

Meggers, W. F.

W. F. Meggers and R. W. Stanley, J. Res. Natl. Bur. Std. (U. S.) 69A, 109 (1965).

W. F. Meggers, Trans. Intern. Astron. Union 9, 225 (1955).

W. F. Meggers and R. W. Stanley, J. Res. Natl. Bur. Std. (U. S.) 61, 95 (1958).

Radziemski, Jr., L. J.

L. J. Radziemski. Jr. (private communication). This program was developed by Radziemski, K. L. Andrew, and his students.

Stanley, R. W.

W. F. Meggers and R. W. Stanley, J. Res. Natl. Bur. Std. (U. S.) 61, 95 (1958).

A. Davison, A. Giacchetti, and R. W. Stanley, J. Opt. Soc. Am. 52, 447 (1962).

W. F. Meggers and R. W. Stanley, J. Res. Natl. Bur. Std. (U. S.) 69A, 109 (1965).

Steers, E. B. M.

E. B. M. Steers, Spectrochem. Acta 23B, 135 (1967).

Valero, F. P. J.

D. Goorvitch, F. P. J. Valero, and A. L. Clúa, J. Opt. Soc. Am. 59, 971 (1969).

F. P. J. Valero, J. Opt. Soc. Am. 58, 484, 1048 (1968).

A. Giacchetti, M. Gallardo, M. J. Garavaglia, Z. Gonzalez, F. P. J. Valero, and E. Zakowicz, J. Opt. Soc. Am. 54, 957 (1964).

Wood, A.

T. A. Littlefield and A. Wood, J. Opt. Soc. Am. 55, 1509 (1965).

Zakowicz, E.

A. Giacchetti, M. Gallardo, M. J. Garavaglia, Z. Gonzalez, F. P. J. Valero, and E. Zakowicz, J. Opt. Soc. Am. 54, 957 (1964).

Zalubas, R.

R. Zalubas, J. Opt. Soc. Am. 58, 1195 (1968).

Other (12)

W. F. Meggers, Trans. Intern. Astron. Union 9, 225 (1955).

W. F. Meggers and R. W. Stanley, J. Res. Natl. Bur. Std. (U. S.) 61, 95 (1958).

A. Davison, A. Giacchetti, and R. W. Stanley, J. Opt. Soc. Am. 52, 447 (1962).

A. Giacchetti, M. Gallardo, M. J. Garavaglia, Z. Gonzalez, F. P. J. Valero, and E. Zakowicz, J. Opt. Soc. Am. 54, 957 (1964).

W. F. Meggers and R. W. Stanley, J. Res. Natl. Bur. Std. (U. S.) 69A, 109 (1965).

T. A. Littlefield and A. Wood, J. Opt. Soc. Am. 55, 1509 (1965).

F. P. J. Valero, J. Opt. Soc. Am. 58, 484, 1048 (1968).

D. Goorvitch, F. P. J. Valero, and A. L. Clúa, J. Opt. Soc. Am. 59, 971 (1969).

R. Zalubas, J. Opt. Soc. Am. 58, 1195 (1968).

L. J. Radziemski. Jr. (private communication). This program was developed by Radziemski, K. L. Andrew, and his students.

T. A. Littlefield, Trans. Intern. Astron. Union 11B, 212 (1961).

E. B. M. Steers, Spectrochem. Acta 23B, 135 (1967).

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