EFFECT OF PRESSURE ON THE M CENTER IN ALKALI HALIDE CRYSTALS

Journal Article · Fri Jul 01 04:00:00 EDT 1960 · Journal of Chemical Physics (U.S.)

DOI:https://doi.org/10.1063/1.1731100· OSTI ID:4173565

Minomura, S; Drickamer, H G

The effect of pressure to 52,800 atm was measured on the M band in NaCI, KCI, KBr, and KI, and on the R/sub 2/ and N bands in KCI. in general, the band peak shifted to higher frequency with increasing pressure for all bands. At the phase transition from fcc to sc there was a blue shift in KCI, but a red shift in KBr and KI. The shift could correspond to a balance between contraction and polarizability effects. From an Ivey-type relation, it would seem that the M center was somewhat less compressible than the F center. There was a marked increase in intensity of the M center in the potassium halides in going through the phase transition from the fcc to the sc lattice. (auth) The replacement of protons by deuterons in naphthalene increased the phosphorescence lifetime from 2.1 to 16.9 sec. The suggestion that the isotope effect might arise from nuclear hyperfine interactions was considered. Observed independence of phosphorescence lifetime on molecular orientution in the magnetic field did not eliminate that effect. (M. C.G.)

• Research Organization: Univ. of Illinois, Urbana
• Sponsoring Organization: USDOE
• NSA Number: NSA-14-019611
• OSTI ID: 4173565
• Journal Information: Journal of Chemical Physics (U.S.), Journal Name: Journal of Chemical Physics (U.S.) Vol. Vol: 33; ISSN JCPSA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

CRYSTALS
DEFECTS
FREQUENCY
LATTICES
M CENTERS
MEASURED VALUES
PHYSICS
POLARIZATION
POTASSIUM BROMIDES
POTASSIUM CHLORIDES
POTASSIUM IODIDES
PRESSURE
SODIUM CHLORIDES
SPECTRAL SHIFT
VACANCIES