Materials Science Forum Vols. 457-460

Abstract: We report isotope shifts of the no-phonon lines of V_Si+H/D complexes observed in lowtemperature photoluminescence spectra of proton/deuteron implanted and annealed samplesshowing both the hydrogen and deuterium spectra. We propose that the isotope shift of the nophonon lines is related to the zero-point energies of the vibrations in both the electronic ground andexcited states of the complex. The red shift of the deuterium no phonon line with respect to thehydrogen line is consistent with a stiffer spring constant for the potential well associated with theexcited state. We tentatively assign a weak shoulder on the H^s₃ first harmonic line to the ¹³C isotope.