Two-electron F' centers in alkali halides: a saddle point approach. I. General and semicontinuum analyses

Details Two-electron F' centers in alkali halides: a saddle point approach. I. General and semicontinuum analyses Two-electron F' centers in alkali halides: a saddle point approach. I. General and semicontinuum analyses

2006-08-16

arxiv.org/abs/cond-mat/0608360v1

Physics

Condensed Matter

Materials Science

14 pages including 2 figures and 1 table, all pdf format

Scientific paper

The F' center in an alkali halide forms when an anion vacancy traps two electrons which is the prerequisite of a diatomic molecule. Indeed, the center may displace left or right along <110> in a (110) plane, due to its coupling to the B_{1u} vibrational mode of <110> polarization respectively. On jumping from the initial position to the final position the F' center passes through a saddle point which configuration is molecule-like being conformed by two neighboring semi-vacancies along <110>. Each semi-vacancy traps one electron to change its effective charge from +1/2 to -1/2 formin a semi-F' center. We ouline the basic theory so as to perform calculations on the F' eigenenergies in the two configurations to see which one of them is more favorable.

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