Abstract

New vacuum wavelengths for nine lines of He I in the near ultraviolet and visible regions are given. They were obtained by measurement relative to 5462.2707 A and 4359.5625 A of Hg<sup>198</sup> I with an evacuated Fabry-Perot interferometer. Liquid-nitrogen cooled helium lamps were used. Interference fringes were obtained for the helium line 5017 A with spacers up to 50 mm in length. The wavelength of this line, which was used as a reference wavelength in some previous work on the Rydberg constant, is found to be 5017.0772±0.0003 A (vac.) relative to the stated values for the two standards.

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  1. W. V. Houston, Phys. Rev. 30, 608 (1927).
  2. P. W. Merrill, Sci, Papers Bur. Standards No. 302 (1917); Astrophys. J. 46, 357 (1917).
  3. D. Y. Chu, Phys. Rev. 55, 175 (1939).
  4. Drinkwater, Richardson, and Williams, Proc. Roy. Soc. (London) A174, 164 (1940).
  5. E. R. Cohen, Phys. Rev. 88, 353 (1952).
  6. F. H. Rolt and H. Barrell, Proc. Roy. Soc. (London) A122, 131 (1929).
  7. Trans. Intern. Astron. Union 9, 201 (1957).
  8. Trans. Intern. Astron. Union 10, (to be published).
  9. Wavelengths taken from an unpublished list of preliminary vacuum measurements against the 6440.2491 Cd standard.
  10. W. F. Meggers and F. O. Westfall, J. Research Natl. Bur. Standards 44, 447 (1950).
  11. K. Burns and K. B. Adams, J. Opt. Soc. Am. 43, 1020 (1953).
  12. B. Edlén, J. Opt. Soc. Am. 43, 339 (1953).
  13. A. Pérard, Rev. opt. 7, 1 (1928).
  14. G. W. Series and J. C. Field, Proceedings of Symposium on Interferometry, National Physical Laboratory, Teddington, England, June, 1959 (to be published).
  15. Houston and Chu, Phys. Rev. (in press).

Adams, K. B.

K. Burns and K. B. Adams, J. Opt. Soc. Am. 43, 1020 (1953).

Barrell, H.

F. H. Rolt and H. Barrell, Proc. Roy. Soc. (London) A122, 131 (1929).

Burns, K.

K. Burns and K. B. Adams, J. Opt. Soc. Am. 43, 1020 (1953).

Chu, D. Y.

D. Y. Chu, Phys. Rev. 55, 175 (1939).

Cohen, E. R.

E. R. Cohen, Phys. Rev. 88, 353 (1952).

Edlén, B.

B. Edlén, J. Opt. Soc. Am. 43, 339 (1953).

Field, J. C.

G. W. Series and J. C. Field, Proceedings of Symposium on Interferometry, National Physical Laboratory, Teddington, England, June, 1959 (to be published).

Houston, W. V.

W. V. Houston, Phys. Rev. 30, 608 (1927).

Meggers, W. F.

W. F. Meggers and F. O. Westfall, J. Research Natl. Bur. Standards 44, 447 (1950).

Merrill, P. W.

P. W. Merrill, Sci, Papers Bur. Standards No. 302 (1917); Astrophys. J. 46, 357 (1917).

Pérard, A.

A. Pérard, Rev. opt. 7, 1 (1928).

Rolt, F. H.

F. H. Rolt and H. Barrell, Proc. Roy. Soc. (London) A122, 131 (1929).

Series, G. W.

G. W. Series and J. C. Field, Proceedings of Symposium on Interferometry, National Physical Laboratory, Teddington, England, June, 1959 (to be published).

Westfall, F. O.

W. F. Meggers and F. O. Westfall, J. Research Natl. Bur. Standards 44, 447 (1950).

Other (15)

W. V. Houston, Phys. Rev. 30, 608 (1927).

P. W. Merrill, Sci, Papers Bur. Standards No. 302 (1917); Astrophys. J. 46, 357 (1917).

D. Y. Chu, Phys. Rev. 55, 175 (1939).

Drinkwater, Richardson, and Williams, Proc. Roy. Soc. (London) A174, 164 (1940).

E. R. Cohen, Phys. Rev. 88, 353 (1952).

F. H. Rolt and H. Barrell, Proc. Roy. Soc. (London) A122, 131 (1929).

Trans. Intern. Astron. Union 9, 201 (1957).

Trans. Intern. Astron. Union 10, (to be published).

Wavelengths taken from an unpublished list of preliminary vacuum measurements against the 6440.2491 Cd standard.

W. F. Meggers and F. O. Westfall, J. Research Natl. Bur. Standards 44, 447 (1950).

K. Burns and K. B. Adams, J. Opt. Soc. Am. 43, 1020 (1953).

B. Edlén, J. Opt. Soc. Am. 43, 339 (1953).

A. Pérard, Rev. opt. 7, 1 (1928).

G. W. Series and J. C. Field, Proceedings of Symposium on Interferometry, National Physical Laboratory, Teddington, England, June, 1959 (to be published).

Houston and Chu, Phys. Rev. (in press).

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