Abstract

The wavenumbers of nearly 8000 transitions in Er i and Er ii lying in the visible and near ultraviolet have been measured to an estimated accuracy of ±0.015 cm−1. Of these lines, 385 are observed to show self-reversal at extreme excitation conditions. The high precision of the line list, along with these reversal data, have led to the identification of the seven lowest levels of the ground configuration of neutral erbium, 4f126s2. Furthermore, the classification of the eight lowest levels in singly ionized erbium, as reported by McNally and Vandersluis, has been well corroborated, and two more levels have been found.

© 1965 Optical Society of America

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References

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  1. A. Y. Cabezas, I. Lindgren, and R. Marrus, Phys. Rev. 122, 1796 (1961).
    [Crossref]
  2. G. R. Harrison, Rev. Sci. Instr. 4, 581 (1933).
    [Crossref]
  3. G. H. Dieke and H. M. Crosswhite, Appl. Opt. 2, 675 (1963).
    [Crossref]
  4. J. W. Lindner and S. P. Davis, J. Opt. Soc. Am. 48, 542 (1958).
    [Crossref]
  5. E. F. Worden, R. G. Gutmacher, and J. G. Conway, Appl. Opt. 2, 707 (1963).
    [Crossref]
  6. J. Reader, L. C. Marquet, and S. P. Davis, Appl. Opt. 2, 963 (1963).
  7. L. Wilets and L. C. Bradley, Phys. Rev. 84, 1055 (1951).
    [Crossref]
  8. S. P. Davis and J. G. Phillips, The Red System of the CN Molecule (University of California Press, Berkeley, California, 1963).
  9. W. F. Meggers, C. H. Corliss, and B. F. Scribner, “Tables of Spectral-Line Intensities,” NBS Monograph 32,  Part I (1961).
  10. J. B. Gruber and J. G. Conway, J. Chem. Phys. 32, 1178 (1960).
    [Crossref]
  11. B. R. Judd and L. C. Marquet, J. Opt. Soc. Am. 52, 504 (1962).
    [Crossref]
  12. J. R. McNally and K. L. Vandersluis, J. Opt. Soc. Am. 49, 200 (1959).
    [Crossref]
  13. W. M. Doyle and R. Marrus, Phys. Rev. 131, 1586 (1963).
    [Crossref]
  14. N. Spector, National Bureau of Standards (private communication, April1964).
  15. P. Brix and H. Kopfermann, Z. Physik 126, 344 (1949); P. Brix, ibid.126, 431 (1949). We are indebted to L. C. Bradley, III, for bringing these papers to our attention.
    [Crossref]

1963 (4)

1962 (1)

1961 (2)

A. Y. Cabezas, I. Lindgren, and R. Marrus, Phys. Rev. 122, 1796 (1961).
[Crossref]

W. F. Meggers, C. H. Corliss, and B. F. Scribner, “Tables of Spectral-Line Intensities,” NBS Monograph 32,  Part I (1961).

1960 (1)

J. B. Gruber and J. G. Conway, J. Chem. Phys. 32, 1178 (1960).
[Crossref]

1959 (1)

1958 (1)

1951 (1)

L. Wilets and L. C. Bradley, Phys. Rev. 84, 1055 (1951).
[Crossref]

1949 (1)

P. Brix and H. Kopfermann, Z. Physik 126, 344 (1949); P. Brix, ibid.126, 431 (1949). We are indebted to L. C. Bradley, III, for bringing these papers to our attention.
[Crossref]

1933 (1)

G. R. Harrison, Rev. Sci. Instr. 4, 581 (1933).
[Crossref]

Bradley, L. C.

L. Wilets and L. C. Bradley, Phys. Rev. 84, 1055 (1951).
[Crossref]

Brix, P.

P. Brix and H. Kopfermann, Z. Physik 126, 344 (1949); P. Brix, ibid.126, 431 (1949). We are indebted to L. C. Bradley, III, for bringing these papers to our attention.
[Crossref]

Cabezas, A. Y.

A. Y. Cabezas, I. Lindgren, and R. Marrus, Phys. Rev. 122, 1796 (1961).
[Crossref]

Conway, J. G.

E. F. Worden, R. G. Gutmacher, and J. G. Conway, Appl. Opt. 2, 707 (1963).
[Crossref]

J. B. Gruber and J. G. Conway, J. Chem. Phys. 32, 1178 (1960).
[Crossref]

Corliss, C. H.

W. F. Meggers, C. H. Corliss, and B. F. Scribner, “Tables of Spectral-Line Intensities,” NBS Monograph 32,  Part I (1961).

Crosswhite, H. M.

Davis, S. P.

J. Reader, L. C. Marquet, and S. P. Davis, Appl. Opt. 2, 963 (1963).

J. W. Lindner and S. P. Davis, J. Opt. Soc. Am. 48, 542 (1958).
[Crossref]

S. P. Davis and J. G. Phillips, The Red System of the CN Molecule (University of California Press, Berkeley, California, 1963).

Dieke, G. H.

Doyle, W. M.

W. M. Doyle and R. Marrus, Phys. Rev. 131, 1586 (1963).
[Crossref]

Gruber, J. B.

J. B. Gruber and J. G. Conway, J. Chem. Phys. 32, 1178 (1960).
[Crossref]

Gutmacher, R. G.

Harrison, G. R.

G. R. Harrison, Rev. Sci. Instr. 4, 581 (1933).
[Crossref]

Judd, B. R.

Kopfermann, H.

P. Brix and H. Kopfermann, Z. Physik 126, 344 (1949); P. Brix, ibid.126, 431 (1949). We are indebted to L. C. Bradley, III, for bringing these papers to our attention.
[Crossref]

Lindgren, I.

A. Y. Cabezas, I. Lindgren, and R. Marrus, Phys. Rev. 122, 1796 (1961).
[Crossref]

Lindner, J. W.

Marquet, L. C.

Marrus, R.

W. M. Doyle and R. Marrus, Phys. Rev. 131, 1586 (1963).
[Crossref]

A. Y. Cabezas, I. Lindgren, and R. Marrus, Phys. Rev. 122, 1796 (1961).
[Crossref]

McNally, J. R.

Meggers, W. F.

W. F. Meggers, C. H. Corliss, and B. F. Scribner, “Tables of Spectral-Line Intensities,” NBS Monograph 32,  Part I (1961).

Phillips, J. G.

S. P. Davis and J. G. Phillips, The Red System of the CN Molecule (University of California Press, Berkeley, California, 1963).

Reader, J.

Scribner, B. F.

W. F. Meggers, C. H. Corliss, and B. F. Scribner, “Tables of Spectral-Line Intensities,” NBS Monograph 32,  Part I (1961).

Spector, N.

N. Spector, National Bureau of Standards (private communication, April1964).

Vandersluis, K. L.

Wilets, L.

L. Wilets and L. C. Bradley, Phys. Rev. 84, 1055 (1951).
[Crossref]

Worden, E. F.

Appl. Opt. (3)

J. Chem. Phys. (1)

J. B. Gruber and J. G. Conway, J. Chem. Phys. 32, 1178 (1960).
[Crossref]

J. Opt. Soc. Am. (3)

NBS Monograph 32 (1)

W. F. Meggers, C. H. Corliss, and B. F. Scribner, “Tables of Spectral-Line Intensities,” NBS Monograph 32,  Part I (1961).

Phys. Rev. (3)

W. M. Doyle and R. Marrus, Phys. Rev. 131, 1586 (1963).
[Crossref]

A. Y. Cabezas, I. Lindgren, and R. Marrus, Phys. Rev. 122, 1796 (1961).
[Crossref]

L. Wilets and L. C. Bradley, Phys. Rev. 84, 1055 (1951).
[Crossref]

Rev. Sci. Instr. (1)

G. R. Harrison, Rev. Sci. Instr. 4, 581 (1933).
[Crossref]

Z. Physik (1)

P. Brix and H. Kopfermann, Z. Physik 126, 344 (1949); P. Brix, ibid.126, 431 (1949). We are indebted to L. C. Bradley, III, for bringing these papers to our attention.
[Crossref]

Other (2)

N. Spector, National Bureau of Standards (private communication, April1964).

S. P. Davis and J. G. Phillips, The Red System of the CN Molecule (University of California Press, Berkeley, California, 1963).

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Figures (3)

Fig. 1
Fig. 1

Schematic diagram of the Berkeley plane-grating spectrograph, showing positions of the sources and the order-sorter (predisperser). E is the erbium source in the furnace F; T is the thorium source imaged at E by the mirror M.

Fig. 2
Fig. 2

Part of an erbium spectrogram in the region near 3500 Å. Grating orders are separated in the vertical direction by the order-sorter. The erbium spectrum is above, the thorium spectrum below, in each order.

Fig. 3
Fig. 3

Spectrograms showing reversed lines emitted by a high-vapor-pressure electrodeless discharge lamp. The two lines marked are 3973.036 and 3973.576 Å, in the 15th order. The plate factor is 0.3 Å/mm.

Tables (2)

Tables Icon

Table I Predicted and observed energy levels and g factors in neutral erbium, 4f126s2.

Tables Icon

Table II Observed energy levels in singly ionized erbium, and g factors of 4f12 6s.

Equations (1)

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C = 2 N 2 ( I - D ) / I 2 .