INFRARED PROPERTIES OF CaF$sub 2$, SrF$sub 2$, AND BaF$sub 2$
Journal Article
·
· Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D
Reflectivity and transmission measurements on CaF/sub 2/ SrF/sub 2/, and BaF/sub 2/ are studied to obtain information on the lattice vibrations. The reflection band in each material is analyzed with classical dispersion theory. In order to fit the data, it is necessary to use one strong and one weak resonance in each case. The strong resonance is identified as the transverse optical mode of vibration for zero wave vector, and is at 38.9, 46.1, and 54.3 mu for CaF/sub 2/, SrF/sub 2/, and BaF/sub 2/ respectively. The long-wavelength value for the dielectric constant obtained from the optical measurements is in disagreement with the accepted value for SrF/sub 2/ obtained from capacity measurements. Capacity measurements are made, and show the accepted value for SrF/sub 2/ to be in error. The transverse optical-mode frequencies are shown to agree with the spacing of some of the satellite lines in the emission spectrum of Sm/sup ++/ in these fluorides. (auth)
- Research Organization:
- Bell Telephone Labs., Murray Hill, N.J.
- NSA Number:
- NSA-16-033012
- OSTI ID:
- 4753189
- Journal Information:
- Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 127; ISSN PHRVA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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