Pump−Probe Spectroscopy of Ultrafast Electron Injection from the Excited State of an Anchored Chromophore to a Semiconductor Surface in UHV: A Theoretical Model

摘要: Decay of excited state absorption, owing to charge injection into the conduction band continuum semiconductor states, is obtained via a qualitative theoretical model. The density matrix formalism utilized obtain an expression for sequential pump−probe signal in terms nonlinear third-order polarization molecular system. Electron transfer slower than pump and probe pulses assumed reorganization molecule upon ignored while obtaining final expressions. lifetime decouples from nuclear motion as consequence. electronic states examined various energy positions injecting different bandwidths continuum. decay can be fitted by exponential functions majority cases considering dimensionalities Model calculations are performed snapshot limit signal. Under th...