Electron-phonon interaction of color centers with ZPL 436.55 nm in LiF–O, OH crystals

Absorption spectra were recorded at 7.2–300 K at a LiF–O, OH crystal irradiated and UV. The coupling force (S) with the phonons of the lattice of an electron-vibrational transition with a zero-phonon line of 436.55 nm was determined from the ratio of the intensities in the zero-phonon line and the integral absorption band. The nature of the color center responsible for the absorption band at 390 nm and emission 490 nm is determined from the value of $S$.