Letter | Published:

Raman Spectrum of Alumina and the Luminescence and Absorption Spectra of Ruby

Nature volume 160, page 26 (05 July 1947) | Download Citation

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Abstract

Studies of the Raman spectrum of crystalline alumina are rather scanty and incomplete, evidently because of its comparative feebleness and a continuous fluorescence accompanying it. Deutschbein1, who was the first to investigate the case, recorded only a single frequency shift of 415 cm−1. Later, a second Raman line with a frequency shift of 376 cm−1 was noticed by Miss A. Mani2. A subsequent unpublished investigation by the latter3 gave a hint of the existence of other faint lines besides the two already reported, among which two with frequency shifts 752 cm−1 and 633 cm−1 appeared most definite. It seemed likely that the use of the intense λ 2536.5 mercury resonance radiation as exciter would yield a much more satisfactory Raman spectrum for the substance. This hope has been realized in the present investigation. A large boule of synthetic alumina presented to Sir C. V. Raman by the Linde Air Products Co. of New York gave satisfactory results: unlike the majority of samples of synthetic alumina, this particular one did not become coloured under ultraviolet irradiation.

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References

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    , C.R. Acad. Sci. Paris, 205, 906 (1937).

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    , unpublished work.

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Affiliations

  1. Physics Department, Indian Institute of Science, Bangalore. April 11.

    • R. S. KRISHNAN

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DOI

https://doi.org/10.1038/160026a0

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