Abstract

Two methods for calibration and wavelength calculation for echelle spectrograms are discussed. The rough method employing ruler measurements on photographic enlargements has an accuracy of about 1 in 10<sup>5</sup>. The accurate method using comparator measurements of Th standard lines and a computer routine has given an accuracy of 2 in 10<sup>7</sup> and promises greater precision for spectrograms obtained with modern echelle gratings.

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  1. N. A. Finkelstein, J. Opt. Soc. Am. 43, 90 (1953).
  2. G. R. Harrison, S. P. Davis, and H. J. Robertson, J. Opt. Soc. Am. 43, 853 (1953).
  3. J. J. McNeill, J. Opt. Soc. Am. 49, 441 (1959).
  4. We have discarded the field lens in front of the Littrow slit because it further complicates the mλ space on the plate and because good focus can be obtained only in its absence.
  5. C. F. Freer, Jr., Ph.D. thesis, Clarkson College, 1970; Dissertation Abstr. Intern. 31 2931B (1970) (Univ. Microfilm, Ann Arbor, Mich., Order No. 70–22 582).
  6. F. R. Hickey, M. S. thesis, Clarkson College, 1967.
  7. T. A. Littlefield and A. Wood, J. Opt. Soc. Am. 55, 1509 (1965).
  8. W. F. Meggers and R. W. Stanley, J. Res. Natl. Bur. Std. (U.S.) 69A, 109 (1969).
  9. D. Goorvich, F. P. J. Valero, and A. L. Clua, J. Opt. Soc. Am. 59, 971 (1969).
  10. The range of good focus reported by McNeill (Ref. 3) has been extended by using a flat plate.
  11. J. M. Bennett, J. Opt. Soc. Am. 51, 1133 (1961).
  12. F. L. Moore, Jr. and S. J. Yarosewick, Appl. Opt. 5, 1465 (1966).
  13. B. Furst, Ph.D. thesis, Clarkson College, 1971; Dissertation Abstr. Intern. 32, 4137B (1972) (Order No. 72-1730).

Bennett, J. M.

J. M. Bennett, J. Opt. Soc. Am. 51, 1133 (1961).

Clua, A. L.

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

Davis, S. P.

G. R. Harrison, S. P. Davis, and H. J. Robertson, J. Opt. Soc. Am. 43, 853 (1953).

Finkelstein, N. A.

N. A. Finkelstein, J. Opt. Soc. Am. 43, 90 (1953).

Freer, Jr., C. F.

C. F. Freer, Jr., Ph.D. thesis, Clarkson College, 1970; Dissertation Abstr. Intern. 31 2931B (1970) (Univ. Microfilm, Ann Arbor, Mich., Order No. 70–22 582).

Furst, B.

B. Furst, Ph.D. thesis, Clarkson College, 1971; Dissertation Abstr. Intern. 32, 4137B (1972) (Order No. 72-1730).

Goorvich, D.

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

Harrison, G. R.

G. R. Harrison, S. P. Davis, and H. J. Robertson, J. Opt. Soc. Am. 43, 853 (1953).

Hickey, F. R.

F. R. Hickey, M. S. thesis, Clarkson College, 1967.

Littlefield, T. A.

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

McNeill, J. J.

J. J. McNeill, J. Opt. Soc. Am. 49, 441 (1959).

Meggers, W. F.

W. F. Meggers and R. W. Stanley, J. Res. Natl. Bur. Std. (U.S.) 69A, 109 (1969).

Moore, Jr., F. L.

F. L. Moore, Jr. and S. J. Yarosewick, Appl. Opt. 5, 1465 (1966).

Robertson, H. J.

G. R. Harrison, S. P. Davis, and H. J. Robertson, J. Opt. Soc. Am. 43, 853 (1953).

Stanley, R. W.

W. F. Meggers and R. W. Stanley, J. Res. Natl. Bur. Std. (U.S.) 69A, 109 (1969).

Valero, F. P. J.

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

Wood, A.

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

Yarosewick, S. J.

F. L. Moore, Jr. and S. J. Yarosewick, Appl. Opt. 5, 1465 (1966).

Other (13)

N. A. Finkelstein, J. Opt. Soc. Am. 43, 90 (1953).

G. R. Harrison, S. P. Davis, and H. J. Robertson, J. Opt. Soc. Am. 43, 853 (1953).

J. J. McNeill, J. Opt. Soc. Am. 49, 441 (1959).

We have discarded the field lens in front of the Littrow slit because it further complicates the mλ space on the plate and because good focus can be obtained only in its absence.

C. F. Freer, Jr., Ph.D. thesis, Clarkson College, 1970; Dissertation Abstr. Intern. 31 2931B (1970) (Univ. Microfilm, Ann Arbor, Mich., Order No. 70–22 582).

F. R. Hickey, M. S. thesis, Clarkson College, 1967.

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

W. F. Meggers and R. W. Stanley, J. Res. Natl. Bur. Std. (U.S.) 69A, 109 (1969).

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

The range of good focus reported by McNeill (Ref. 3) has been extended by using a flat plate.

J. M. Bennett, J. Opt. Soc. Am. 51, 1133 (1961).

F. L. Moore, Jr. and S. J. Yarosewick, Appl. Opt. 5, 1465 (1966).

B. Furst, Ph.D. thesis, Clarkson College, 1971; Dissertation Abstr. Intern. 32, 4137B (1972) (Order No. 72-1730).

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