Energy- and angle-resolved pump-probe femtosecond photoelectron spectroscopy: Molecular rotation

We have incorporated a classical treatment of molecular rotation into our f ormulation of energy- and angle-resolved pump-probe photoelectron spectrosc opy. This classical treatment provides a useful approach to extracting the photoelectron signal primarily associated with vibrational dynamics in case s where rotational motion is slow and the coupling between rotational and v ibrational motion is weak. We illustrate its applicability with pump-probe photoelectron spectra for wave packets on the (1)Sigma (+)(u) double-minimu m state of Na-2. (C) 2001 American Institute of Physics.