Excitation and dissociation of tungsten hexacarbonyl W(CO)(6): Statistical and nonstatistical dissociation processes

We have studied the excitation and dissociation processes of the molecule W(CO)(6) in collisions with low kinetic energy (3 keV) protons, monocharged fluorine, and chlorine ions using double charge transfer spectroscopy. By analyzing the kinetic energy loss of the projectile anions, we measured the excitation energy distribution of the produced transient dications W(CO)(6)(2+). By coincidence measurements between the anions and the stable or fragments of W(CO)(6)(2+), we determined the energy distribution for each dissociation channel. Based on the experimental data, the emission of the first CO was tentatively attributed to a nonstatistical direct dissociation process and the emission of the second or more CO ligands was attributed to the statistical dissociation processes. The dissociation energies for the successive breaking of the W-CO bond were estimated using a cascade model. The ratio between charge separation and evaporation (by the loss of CO+ and CO, respectively) channels was estimated to be 6% in the case of Cl+ impact. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3523347]

东北产6种苔类植物细胞学观察

本文对东北产 6种苔类植物进行了染色体数目报道 ,它们是阔叶裂叶苔Lophoziaex cisa ,皱叶裂叶苔L .incisa ,倾立裂叶苔L .ascendens,细裂瓣苔Barbilophoziabarbata ,裂萼苔Chiloscyphuspolyanthus,指叶苔Lepidoziareptans,其染色体数目均为n =9。其中阔叶裂叶苔和倾立裂叶苔为首次报道