Abstract
By measurements of resonant Raman scattering combined with absorption and luminescence at low temperature, excitons and phonons are investigated in AgBr1-xClx for a wide range of composition. One-phonon scattering due to intra- and intervalley exciton relaxation involving various optical and acoustic phonons occurs and is interpreted in terms of a modified model used to describe resonant two-phonon scattering in AgBr and AgCl. The analysis of the energy-dependent cross section of dispersive and non-dispersive phonon scattering suggests the existence of various quasi-free exciton states for x>or=0.2 that are characterised by finite effective-mass values but lie lower in energy compared with the free-exciton absorption. For the first time the phonon mode behaviour is studied for phonons at different points outside the centre of the Brillouin zone and discussed within a recently developed model.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call