COLOR CENTERS IN ALKALINE EARTH FLUORIDES

Journal Article · Tue Nov 15 04:00:00 EST 1960 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.120.1162· OSTI ID:4145894

Messner, D; Smakula, A

Single crystals of CaF/sub 2/, SrF/sub 2/, and BaF/sub 2/ were colored by x rays (150 kv) and high-energy electrons (2.5 Mev). Five color-center bands in CaF/sub 2/ and SrF/sub 2/ and nine in BaF/sub 2/ were observed in the spectral region between 0.175 and 0.8 mu . At room temperature the bands in CaF/sub 2/ are well resolved; whereas, those in SrF/sub 2/ and BaF/sub 2/ overlap. At -190 and -255 deg C, the bands sharpen but generally do not shift, except the 580-m mu band in CaF/sub 2/, which shifts toward longer wavelengths. Photochemical bleaching of the strongest band shows a certain influence on the others. Three bands could be correlated to the Mollwo relation with the exponent 3.85. A possible correlation of the absorption bands to certain models is discussed. (auth)

• Research Organization: Massachusetts Inst. of Tech., Cambridge
• NSA Number: NSA-15-003173
• OSTI ID: 4145894
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 120; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ABSORPTION
BARIUM FLUORIDES
BLEACHING
CALCIUM FLUORIDES
COLOR
COLOR CENTERS
CRYSTALS
DEFECTS
ELECTRON BEAMS
LATTICES
LOW TEMPERATURE
METALS, CERAMICS, AND OTHER MATERIALS
PHOTOCHEMISTRY
RADIATION EFFECTS
SPECTRA
STRONTIUM FLUORIDES
VARIATIONS
X RADIATION