Wavelength Dependence of the Multiphoton Ionization and Fragmentation Dynamics ofCr(CO)6/Methanol van der Waals Heteroclusters

摘要

Mixed van der Waals clusters of Cr(CO)6 and methanol, generated in a pulsed free-jet expansion of seeded helium, are irradiated by strongly focused UV laser pulses, corresponding to intensities on the order of 10 12 to 10 13 W/cm2. Photoions created via multiphoton dissociation (MPD) and ionization (MPI) of these neutral clusters are analyzed by time-of-flight mass spectrometry. We find that the multiphoton dissociation and ionization dynamics of Cr(CO)6 within van der Waals clusters are quite unusual in comparison to those of the naked molecule, since the observed photoion yields are highly wavelength dependent, and since complete ligand stripping does not appear to dominate the photophysics in the neutral ladder. (jes)