Photodissociation Dynamics of Water Containing Clusters. I. Kr.H2O(+)

摘要

The mass selected KrxH2O+ cluster is photodissociated in the range 514 to 357 nmusing lines from an Argon Ion laser. Product branching ratios are measured and shown to be a strong function of photon wavelength; Kr+/H2) products dominate at 357 nm (90%) but are equal in intensity to H2O+/Kr products at 514 nm. A small KrH+/OH product is observed at all wavelengths, representing the first observation of a photoinduced intracluster proton transfer reaction. The total cross section is estimated to be 2x10-19 cm2 at 514 nm. Laser polarization studies indicated the Kr+/H2O products come from direct accessing of a repulsive upper state (intracluster charge transfer reaction). Both Kr+(2P3/2) and Kr+(2P1/2) spin orbit states are formed but their branching ratio is very strongly dependent on wavelength: 100% Kr+(2P3/2) at 514 nm and 100% Kr+(2P1/2) at 357 nm and variable amounts of each in between.