Consistent temperature-broadening of EPR line of Ti3+ ions with that of bulk Raman spectrum related to laser-quality chrysoberyl

Raman scattering for three kinds of chrysoberyl, undoped, doped with Ti3+ i ons or Cr3+ ions, has been measured. The half-widths, W, of several Raman l ines with A, symmetry modes are represented as a form of W = A coth(B/kT). The fitting parameters of A and B are 4-11 cm(-1) and 40-60 meV, respective ly. The red-shifts of the Raman lines with increasing temperature are found also to be the same form to W. The form is coincident with an empirical fo rm of the EPR linewidth of Ti3+ ions in chrysoberyl obtained by us previous ly. The facts may imply that the local phonon modes, which would be caused from bulk phonons, would contribute to phonon-assisted relaxation of Ti3+ i on system in chrysoberyl.