Abstract

Laser-excited Raman spectra have been observed in single crystals of Y<sub>2</sub>O<sub>3</sub>, Y<sub>2</sub>O<sub>3</sub>(Eu<sup>3+</sup>), Er<sub>2</sub>O<sub>3</sub>, and YB<sub>2</sub>O<sub>3</sub> at 10, 80, and 300 K. In Y<sub>2</sub>O<sub>3</sub>(Eu<sup>3+</sup>) the symmetries of the excited levels have been determined. The optically active phonons can be separated into two groups; in one group (above 300 cm<sup>-1</sup>) the internal vibrations of (R.E.-O<sub>6</sub>) octahedrons are preponderant, whereas in the other group (below 200 cm<sup>-1</sup>) the translational motions of these octahedrons and the R.E. ions are dominant. In Y<sub>2</sub>O<sub>3</sub>(Eu<sup>3+</sup>) electronic transitions (<sup>2</sup>F<sub>0</sub> → <sup>2</sup>F<sub>2</sub>) of the Eu ions in C<sub>3i</sub>-site symmetry have been observed and the symmetries of the crystal-field-split levels have been determined. Other effects, which may also be attributed to electronic Raman transitions, have been observed in Er<sub>2</sub>O<sub>3</sub> and Yb<sub>2</sub>O<sub>3</sub>.

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  1. J. B. Gruber, W. F. Krupke, and J. M. Poindexter, J. Chem. Phys. 41, 3363 (1964).
  2. J. B. Gruber, J. R. Henderson, H. Muramoto, K. Rajnak, and J. G. Conway, J. Chem. Phys. 45, 477 (1966).
  3. N. T. McDevitt and A. D. Davidson, J. Opt. Soc. Am. 56, 636 (1966).
  4. D. Bloor, E. Ellis, D. H. Martin, and A. Wadham, J. Appl. Phys. 39, 971 (1968).
  5. H. Bonrath, K. H. Hellwedge, K. Nicoly, and G. Weber, Phys. Kondens. Materie 4, 382 (1966).
  6. R. M. Moon, H. R. Child, W. C. Koehler, and L. J. Raubenheimer, J. Appl. Phys. 38, 1383 (1967).
  7. B. H. Soffer and R. H. Hoskins, Appl. Phys. Letters 6, 200 (1965).
  8. R. W. G. Wyckoff, Crystal Structures, Vol. 2, 2nd ed. (Wiley—Interscience, New York, 1964).
  9. I. Warshaw and R. Roy, in Progress in the Science and Technology of the Rare Earths, edited by LeRoy Eyring (Pergamon, Oxford, 1964), p. 203.
  10. G. Schäfer, dissertation, Inst. für Technische Physik, T. H. Darmstadt, 1969.
  11. J. A. Koningstein and O. S. Mortensen, J. Mol. Spectrosc. 27, 343 (1968).
  12. N. C. Chang and J. B. Gruber, J. Chem. Phys. 41, 3227 (1964).
  13. J. A. Koningstein and O. Sonnich Mortensen, J. Opt. Soc. Am. 58, 1208 (1968).
  14. R. Loudon, Advan. Phys. 13, 423 (1964).
  15. H. Forest and G. Ban, J. Electrochem. Soc. 116, 474 (1969).
  16. G. K. Koster, J. D. Dimmock, R. G. Wheeler, and H. Statz, Properties of the Thirty-Two-Point Groups (M.I.T. Press, Cambridge, Mass., 1963).
  17. Y. D. Harker, C. Y. She, and D. F. Edwards, Appl. Phys. Letters 15, 272 (1969).
  18. R. G. Wheeler, in Optical Properties of Ions in Crystals, edited by H. M. Crosswhite and H. W. Moos (Wiley—Interscience, New York, London, Sydney, 1967), p. 533.

Ban, G.

H. Forest and G. Ban, J. Electrochem. Soc. 116, 474 (1969).

Bloor, D.

D. Bloor, E. Ellis, D. H. Martin, and A. Wadham, J. Appl. Phys. 39, 971 (1968).

Bonrath, H.

H. Bonrath, K. H. Hellwedge, K. Nicoly, and G. Weber, Phys. Kondens. Materie 4, 382 (1966).

Chang, N. C.

N. C. Chang and J. B. Gruber, J. Chem. Phys. 41, 3227 (1964).

Child, H. R.

R. M. Moon, H. R. Child, W. C. Koehler, and L. J. Raubenheimer, J. Appl. Phys. 38, 1383 (1967).

Conway, J. G.

J. B. Gruber, J. R. Henderson, H. Muramoto, K. Rajnak, and J. G. Conway, J. Chem. Phys. 45, 477 (1966).

Davidson, A. D.

N. T. McDevitt and A. D. Davidson, J. Opt. Soc. Am. 56, 636 (1966).

Dimmock, J. D.

G. K. Koster, J. D. Dimmock, R. G. Wheeler, and H. Statz, Properties of the Thirty-Two-Point Groups (M.I.T. Press, Cambridge, Mass., 1963).

Edwards, D. F.

Y. D. Harker, C. Y. She, and D. F. Edwards, Appl. Phys. Letters 15, 272 (1969).

Ellis, E.

D. Bloor, E. Ellis, D. H. Martin, and A. Wadham, J. Appl. Phys. 39, 971 (1968).

Forest, H.

H. Forest and G. Ban, J. Electrochem. Soc. 116, 474 (1969).

Gruber, J. B.

J. B. Gruber, W. F. Krupke, and J. M. Poindexter, J. Chem. Phys. 41, 3363 (1964).

J. B. Gruber, J. R. Henderson, H. Muramoto, K. Rajnak, and J. G. Conway, J. Chem. Phys. 45, 477 (1966).

N. C. Chang and J. B. Gruber, J. Chem. Phys. 41, 3227 (1964).

Harker, Y. D.

Y. D. Harker, C. Y. She, and D. F. Edwards, Appl. Phys. Letters 15, 272 (1969).

Hellwedge, K. H.

H. Bonrath, K. H. Hellwedge, K. Nicoly, and G. Weber, Phys. Kondens. Materie 4, 382 (1966).

Henderson, J. R.

J. B. Gruber, J. R. Henderson, H. Muramoto, K. Rajnak, and J. G. Conway, J. Chem. Phys. 45, 477 (1966).

Hoskins, R. H.

B. H. Soffer and R. H. Hoskins, Appl. Phys. Letters 6, 200 (1965).

Koehler, W. C.

R. M. Moon, H. R. Child, W. C. Koehler, and L. J. Raubenheimer, J. Appl. Phys. 38, 1383 (1967).

Koningstein, J. A.

J. A. Koningstein and O. Sonnich Mortensen, J. Opt. Soc. Am. 58, 1208 (1968).

J. A. Koningstein and O. S. Mortensen, J. Mol. Spectrosc. 27, 343 (1968).

Koster, G. K.

G. K. Koster, J. D. Dimmock, R. G. Wheeler, and H. Statz, Properties of the Thirty-Two-Point Groups (M.I.T. Press, Cambridge, Mass., 1963).

Krupke, W. F.

J. B. Gruber, W. F. Krupke, and J. M. Poindexter, J. Chem. Phys. 41, 3363 (1964).

Loudon, R.

R. Loudon, Advan. Phys. 13, 423 (1964).

Martin, D. H.

D. Bloor, E. Ellis, D. H. Martin, and A. Wadham, J. Appl. Phys. 39, 971 (1968).

McDevitt, N. T.

N. T. McDevitt and A. D. Davidson, J. Opt. Soc. Am. 56, 636 (1966).

Moon, R. M.

R. M. Moon, H. R. Child, W. C. Koehler, and L. J. Raubenheimer, J. Appl. Phys. 38, 1383 (1967).

Mortensen, O. S.

J. A. Koningstein and O. S. Mortensen, J. Mol. Spectrosc. 27, 343 (1968).

Mortensen, O. Sonnich

J. A. Koningstein and O. Sonnich Mortensen, J. Opt. Soc. Am. 58, 1208 (1968).

Muramoto, H.

J. B. Gruber, J. R. Henderson, H. Muramoto, K. Rajnak, and J. G. Conway, J. Chem. Phys. 45, 477 (1966).

Nicoly, K.

H. Bonrath, K. H. Hellwedge, K. Nicoly, and G. Weber, Phys. Kondens. Materie 4, 382 (1966).

Poindexter, J. M.

J. B. Gruber, W. F. Krupke, and J. M. Poindexter, J. Chem. Phys. 41, 3363 (1964).

Rajnak, K.

J. B. Gruber, J. R. Henderson, H. Muramoto, K. Rajnak, and J. G. Conway, J. Chem. Phys. 45, 477 (1966).

Raubenheimer, L. J.

R. M. Moon, H. R. Child, W. C. Koehler, and L. J. Raubenheimer, J. Appl. Phys. 38, 1383 (1967).

Roy, R.

I. Warshaw and R. Roy, in Progress in the Science and Technology of the Rare Earths, edited by LeRoy Eyring (Pergamon, Oxford, 1964), p. 203.

Schäfer, G.

G. Schäfer, dissertation, Inst. für Technische Physik, T. H. Darmstadt, 1969.

She, C. Y.

Y. D. Harker, C. Y. She, and D. F. Edwards, Appl. Phys. Letters 15, 272 (1969).

Soffer, B. H.

B. H. Soffer and R. H. Hoskins, Appl. Phys. Letters 6, 200 (1965).

Statz, H.

G. K. Koster, J. D. Dimmock, R. G. Wheeler, and H. Statz, Properties of the Thirty-Two-Point Groups (M.I.T. Press, Cambridge, Mass., 1963).

Wadham, A.

D. Bloor, E. Ellis, D. H. Martin, and A. Wadham, J. Appl. Phys. 39, 971 (1968).

Warshaw, I.

I. Warshaw and R. Roy, in Progress in the Science and Technology of the Rare Earths, edited by LeRoy Eyring (Pergamon, Oxford, 1964), p. 203.

Weber, G.

H. Bonrath, K. H. Hellwedge, K. Nicoly, and G. Weber, Phys. Kondens. Materie 4, 382 (1966).

Wheeler, R. G.

G. K. Koster, J. D. Dimmock, R. G. Wheeler, and H. Statz, Properties of the Thirty-Two-Point Groups (M.I.T. Press, Cambridge, Mass., 1963).

R. G. Wheeler, in Optical Properties of Ions in Crystals, edited by H. M. Crosswhite and H. W. Moos (Wiley—Interscience, New York, London, Sydney, 1967), p. 533.

Wyckoff, R. W. G.

R. W. G. Wyckoff, Crystal Structures, Vol. 2, 2nd ed. (Wiley—Interscience, New York, 1964).

Other

J. B. Gruber, W. F. Krupke, and J. M. Poindexter, J. Chem. Phys. 41, 3363 (1964).

J. B. Gruber, J. R. Henderson, H. Muramoto, K. Rajnak, and J. G. Conway, J. Chem. Phys. 45, 477 (1966).

N. T. McDevitt and A. D. Davidson, J. Opt. Soc. Am. 56, 636 (1966).

D. Bloor, E. Ellis, D. H. Martin, and A. Wadham, J. Appl. Phys. 39, 971 (1968).

H. Bonrath, K. H. Hellwedge, K. Nicoly, and G. Weber, Phys. Kondens. Materie 4, 382 (1966).

R. M. Moon, H. R. Child, W. C. Koehler, and L. J. Raubenheimer, J. Appl. Phys. 38, 1383 (1967).

B. H. Soffer and R. H. Hoskins, Appl. Phys. Letters 6, 200 (1965).

R. W. G. Wyckoff, Crystal Structures, Vol. 2, 2nd ed. (Wiley—Interscience, New York, 1964).

I. Warshaw and R. Roy, in Progress in the Science and Technology of the Rare Earths, edited by LeRoy Eyring (Pergamon, Oxford, 1964), p. 203.

G. Schäfer, dissertation, Inst. für Technische Physik, T. H. Darmstadt, 1969.

J. A. Koningstein and O. S. Mortensen, J. Mol. Spectrosc. 27, 343 (1968).

N. C. Chang and J. B. Gruber, J. Chem. Phys. 41, 3227 (1964).

J. A. Koningstein and O. Sonnich Mortensen, J. Opt. Soc. Am. 58, 1208 (1968).

R. Loudon, Advan. Phys. 13, 423 (1964).

H. Forest and G. Ban, J. Electrochem. Soc. 116, 474 (1969).

G. K. Koster, J. D. Dimmock, R. G. Wheeler, and H. Statz, Properties of the Thirty-Two-Point Groups (M.I.T. Press, Cambridge, Mass., 1963).

Y. D. Harker, C. Y. She, and D. F. Edwards, Appl. Phys. Letters 15, 272 (1969).

R. G. Wheeler, in Optical Properties of Ions in Crystals, edited by H. M. Crosswhite and H. W. Moos (Wiley—Interscience, New York, London, Sydney, 1967), p. 533.

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