Spectral inhomogeneity induced by vacancies and thermal phonons and associated observables in time- and frequency-domain nonlinear spectroscopy: I₂ isolated in matrix argon

The role of spectral inhomogeneity on time- and frequency-domain observables was addressed. Vacancy point defects were considered as a representative class. Inhomogeneity due to the anharmonic coupling between chromophore and lattice modes was also considered. The results suggest that at a vacancy concentration of 1.5%, the site splittings would dominate spectral distributions.