  This article reviews trajectory surface hopping methods to study
conformationally controlled photochemistry. Besides focusing on the linear
response time-dependent density functional theory surface hopping method, it
reviews the generation of Boltzmann ensembles as starting conditions for
photochemical dynamics, the calculation of electronic and vibronic absorption
spectra, and the prediction of wavelength-dependent photochemical product
quantum yields. Applications include organic photochemistry and vitamin D
photochemistry.
