16915-28-9Relevant articles and documents
Charge transfer half-collisions: Photodissociation of the Kr*O2+ cluster ion with resolution of the O2 product vibrational states
Jarrold, Martin F.,Misev, Liubomir,Bowers, Michael T.
, p. 4369 - 4379 (1984)
The photodissociation of the Kr*O2+ cluster ion has been studied in the visible and UV regions of the spectrum (350-580 nm) using a crossed high energy ion beam/laser beam experiment.Photodissociation of Kr*O2+ occurs by a charge transfer transition to Kr+*O2 state(s).The only ionic product observed was Kr+.A value for the dissociation energy of the Kr*O2+ cluster of D00(Kr-O2+) 0.33 eV was estimated from the results.A compilation of ion-molecule cluster dissociation energies is given.The product angular distributions indicate that the lifetime of the excited state(s) is less than a rotational period.In the visible region of the spectrum the products are Kr+(2Ρ3/2) + O2(2Σ-).For the UV it is argued that one of the products is probably electronically excited +(2Ρ,2Ρ1/2) or O2(1Δg)>.The product relative kinetic energy distributions show resolved features that can be assigned to production of the product O2 in specific vibrational states.Information on the product rotational excitation was also derived from these results.The potential surfaces of the + system are discussed along with literature data on the charge transfer reaction between Kr+ and O2.
Collisions of rare gas ions with C60: Endohedral formation, energy transfer, and scattering dynamics
Basir, Yousef,Anderson, Scott L.
, p. 8370 - 8379 (1997)
Scattering of rare gas cations from C60 has been studied in a guided-beam tandem mass spectrometer. Charge transfer (CT) is observed to be the dominant channel over the collision energy range from O to 100 eV, but dissociative CT and endohedral complex formation are significant at high collision energies. The threshold energies for endohedral penetration are found to be proportional to rare gas atom size. Our CT and dissociative CT data allow us to make several conclusions about the nature of energy transfer in rare gas-fullerene collisions. Surprisingly, the conclusion is that the energy transfer distribution must be sharply bimodal, with ～85% of collisions resulting in little collision-to-internal energy transfer, and ～15% of collisions being essentially 100% inelastic. The results indicate that the dissociative CT and endocomplex formation channels are closely related.
Photodissociation dynamics of water containing clusters. I. Kr*H2O+
Kim, H-S.,Kuo, C-H.,Bowers, M. T.
, p. 5594 - 5604 (1990)
The mass selected Kr*H2O+ cluster is photodissociated in the range 514 to 357 nm using lines from an argon ion laser.Product branching ratios are measured and shown to be a strong function of photon wavelength; Kr+/H2O products dominate at 357 nm (90percent) but are equal in intensity to H2O+/Kr products at 514 nm.A small KrH+/OH product is observed at all wavelengths (ca. 5percent), representing the first observation of a photoinduced, intracluster proton transfer reaction.The total cross section is estimated to be ca. 2 * 10-19 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: 100percent Kr+ (2P3/2) at 514 nm, 100percent Kr+ (2P1/2) at 357 nm, and variable amounts of each in between.Analysis of the kinetic energy distribution of Kr+/H2O products indicates H2O is strongly rotationally excited (0.18 to 0.23 eV).This fact, coupled with analysis from an impulsive model for Kr+-H2O dissociation suggests the Kr atom is above (or below) the H2O+ plane in the Kr*H2O+) ground state, situated closer to the O end of the molecule.Further analysis of the Kr+/H20 kinetic energy distribution yields the binding energy D00(Kr-H2O+) = 0.33 +/- 0.1 eV.Polarization studies indicate H2O+/Kr products arise from a bound upper state.Phase space theory modeling of the kinetic energy distribution indicates the H2O+ product is formed with ca. 1.3 eV internal energy.Two models are discussed, one that suggests H2O+ (A2A1) is formed and a second that suggests H2O+ is the chromophore, internally converts to vibrationally hot H2O+(2B1) and slowly leaks vibrational energy to the cluster as a whole before dissociating.The KrH+/OH products are formed via statistical vibrational predissociation of a bound state and a possible mechanism is discussed.
