Abstract

The three groups of fluorescent line spectra of Tb<sup>3+</sup> in CaF<sub>2</sub> " spectrum I" between the crystal-field split levels of the <sup>5</sup><i>D</i><sub>4</sub> and the <sup>7</sup>F<sub>3</sub>, <sup>7</sup>F<sub>4</sub>, and <sup>7</sup>F<sub>5</sub> free-ion states have been combined into energy-level schemes which tend to support a cubic crystal field symmetry and which give information on the crystal-field split-leve representations and energies to 5 cm<sup>-1</sup> for a thin crystal.

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  1. N. Rabbiner, Phys. Rev. 132, 224 (1963). This analysis was for a thin crystal.
  2. I. V. Stepanov and P. P. Feofilov, Dokl. Akad. Nauk SSSR 4, 615 (1957) [English transl.: Soviet Phys.—Doklady 1, 350 (1956)].
  3. H. H. Theissing, P. Caplan, T. Ewanizky, and G. DeLhery, Appl. Opt. 2, 291 (1963).
  4. P. P. Geofilov, Opt. i Spektroskopiya 10, 142 (1961) [English transl.: Opt. Spectry. 10, 70(1961)]; G. S. Ofelt, J. Chem. Phys. 38, 2171 (1963).
  5. H. Bethe, Ann. Physik 3, 133 (1929).
  6. The Oh group has a center of symmetry and therefore electric dipole transitions are forbidden; thus, the symmetry may be cubic, close to Oh, if these are electric dipole transitions.
  7. K. R. Lea, M. J. M. Leask, and W. P. Wolf, J. Phys. Chem. Solids 23, 1381 (1962).
  8. M. J. Weber and R. W. Bierig, Phys. Rev. 134, A1492 (1964).
  9. B. G. Wybourne, J. Chem. Phys. 36, 2301 (1962).

Bethe, H.

H. Bethe, Ann. Physik 3, 133 (1929).

Bierig, R. W.

M. J. Weber and R. W. Bierig, Phys. Rev. 134, A1492 (1964).

Caplan, P.

H. H. Theissing, P. Caplan, T. Ewanizky, and G. DeLhery, Appl. Opt. 2, 291 (1963).

DeLhery, G.

H. H. Theissing, P. Caplan, T. Ewanizky, and G. DeLhery, Appl. Opt. 2, 291 (1963).

Ewanizky, T.

H. H. Theissing, P. Caplan, T. Ewanizky, and G. DeLhery, Appl. Opt. 2, 291 (1963).

Feofilov, P. P.

I. V. Stepanov and P. P. Feofilov, Dokl. Akad. Nauk SSSR 4, 615 (1957) [English transl.: Soviet Phys.—Doklady 1, 350 (1956)].

Geofilov, P. P.

P. P. Geofilov, Opt. i Spektroskopiya 10, 142 (1961) [English transl.: Opt. Spectry. 10, 70(1961)]; G. S. Ofelt, J. Chem. Phys. 38, 2171 (1963).

Lea, K. R.

K. R. Lea, M. J. M. Leask, and W. P. Wolf, J. Phys. Chem. Solids 23, 1381 (1962).

Leask, M. J. M.

K. R. Lea, M. J. M. Leask, and W. P. Wolf, J. Phys. Chem. Solids 23, 1381 (1962).

Rabbiner, N.

N. Rabbiner, Phys. Rev. 132, 224 (1963). This analysis was for a thin crystal.

Stepanov, I. V.

I. V. Stepanov and P. P. Feofilov, Dokl. Akad. Nauk SSSR 4, 615 (1957) [English transl.: Soviet Phys.—Doklady 1, 350 (1956)].

Theissing, H. H.

H. H. Theissing, P. Caplan, T. Ewanizky, and G. DeLhery, Appl. Opt. 2, 291 (1963).

Weber, M. J.

M. J. Weber and R. W. Bierig, Phys. Rev. 134, A1492 (1964).

Wolf, W. P.

K. R. Lea, M. J. M. Leask, and W. P. Wolf, J. Phys. Chem. Solids 23, 1381 (1962).

Wybourne, B. G.

B. G. Wybourne, J. Chem. Phys. 36, 2301 (1962).

Other (9)

N. Rabbiner, Phys. Rev. 132, 224 (1963). This analysis was for a thin crystal.

I. V. Stepanov and P. P. Feofilov, Dokl. Akad. Nauk SSSR 4, 615 (1957) [English transl.: Soviet Phys.—Doklady 1, 350 (1956)].

H. H. Theissing, P. Caplan, T. Ewanizky, and G. DeLhery, Appl. Opt. 2, 291 (1963).

P. P. Geofilov, Opt. i Spektroskopiya 10, 142 (1961) [English transl.: Opt. Spectry. 10, 70(1961)]; G. S. Ofelt, J. Chem. Phys. 38, 2171 (1963).

H. Bethe, Ann. Physik 3, 133 (1929).

The Oh group has a center of symmetry and therefore electric dipole transitions are forbidden; thus, the symmetry may be cubic, close to Oh, if these are electric dipole transitions.

K. R. Lea, M. J. M. Leask, and W. P. Wolf, J. Phys. Chem. Solids 23, 1381 (1962).

M. J. Weber and R. W. Bierig, Phys. Rev. 134, A1492 (1964).

B. G. Wybourne, J. Chem. Phys. 36, 2301 (1962).

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