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Absorption Spectra of Cr^(3+) in Al_2O_3 Under Shock Compression

Goto, Tsuneaki and Ahrens, Thomas J. and Rossman, George R. (1979) Absorption Spectra of Cr^(3+) in Al_2O_3 Under Shock Compression. Physics and Chemistry of Minerals, 4 (3). pp. 253-263. ISSN 0342-1791. doi:10.1007/BF00307949.

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Unpolarized absorption spectra of single crystals of Cr^(3+) doped Al_2O_3 (synthetic ruby) have measured using a new, time-resolving, dispersive, streak photographic system over the range ∼350 to ∼700 nm during a series of shock loading experiments. The crystal field absorptions assigned to the transition ^4A_(2g) → ^4T_(2g) were observed to shift in a series of experiments from 555±1 nm at atmospheric pressure to 503±5 nm at 46 GPa. In a single experiment at 32 GPa the ^4A_(2g) → 4 T_(1g) transition was observed to shift from 405±1 to 386±5 nm. The present data extrapolate downwards in compression toward the 10 GPa data of Stephens and Drickamer (1961) although both crystal field absorption energies increase considerably less with compression than predicted by the simple ionic point charge model. The single datum observed for the Racah parameter B, 588±38 cm^(−1) at 32 GPa, is consistant with previous results to 10 GPa and the trend of decreasing B, with compression expected from the divergence of the data from the point charge model due to increasing covalancy.

Item Type:Article
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Rossman, George R.0000-0002-4571-6884
Additional Information:© 1979 Springer-Verlag. Received October 11, 1978. We appreciate the experimental assistance of I. Jackson, H. Richeson, E. Gelle, and R. Smith. Supported under NSF Grant EAR 75-15006A01 and the U.S.-Japan Cooperative Science Program Grant (NSF Grant, INT 76-00573) and the support of the Japan Society for Promotion of Science. Contribution No. 3155, Division of Geological and Planetary Sciences. California Institute of Technology, Pasadena, California 91125.
Funding AgencyGrant Number
NSFEAR 75-15006A01
NSFINT 76-00573
U.S.-Japan Cooperative Science ProgramUNSPECIFIED
Japan Society for Promotion of Science (JSPS)UNSPECIFIED
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Caltech Division of Geological and Planetary Sciences3155
Issue or Number:3
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Official Citation: Absorption spectra of Cr3+ in Al2O3 under shock compression Tsuneaki Goto, Thomas J. Ahrens, George R. Rossman... Pages 253-263
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:44010
Deposited On:26 Feb 2014 18:24
Last Modified:10 Nov 2021 16:46

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