At 45 MeV/u an experiment on fragmentation of projectile(<sup>20</sup>Ne)on <sup>165</sup>Ho was performed.An average reduced width σ<sub>0</sub> of 84.3±6.6 MeV/c was obtaine...At 45 MeV/u an experiment on fragmentation of projectile(<sup>20</sup>Ne)on <sup>165</sup>Ho was performed.An average reduced width σ<sub>0</sub> of 84.3±6.6 MeV/c was obtained by separating the break=up of all com-plex fragments of <sup>20</sup>Ne from the evaporation part of compound nucleus in momentum spectra.展开更多
Reaction resonance or Feshbach resonance in polyatomic reaction is one of the most fascinating phenomena in chemical reaction dynamics. The HO+CH4→HO+CH3 reaction is one of the pivotal polyato-mic reactions concerned...Reaction resonance or Feshbach resonance in polyatomic reaction is one of the most fascinating phenomena in chemical reaction dynamics. The HO+CH4→HO+CH3 reaction is one of the pivotal polyato-mic reactions concerned with both the experimental and theoretical scientists. Reaction probabilities and other dynamic properties of this system were calculated with quantum scattering theory method, but a simple QH(v)+HO(j)→Q+H2O(m,n) reaction model was used, in which only three degrees of freedom and the rotating of OH were considered while making CH3 as a pseudo atom. In this paper, by an ab initio method, partial potential energy surface(PPES) was constructed and all the 15 internal degrees-freedom were given. Feshbach resonance mechanism of this reaction can be obtained by the dynamic Eyring Lake on the PPES and the lifetime of the reactive resonance-state can be estimated using the gap of the vibrational energy levels of transient collision complex in the critical transition-state region. Above interesting dynamic properties would not be given by simple pseudo atomic reaction model.展开更多
The overall reaction was determined on the basis of the dissociation constant of TBA and the ratio of the ligand to the rare earth ion in the complex.The rate law,rate constants and acitivition energies for the reacti...The overall reaction was determined on the basis of the dissociation constant of TBA and the ratio of the ligand to the rare earth ion in the complex.The rate law,rate constants and acitivition energies for the reaction of La^(3+),Gd^(3+)and Ho^(3+)with TBA were studied.It is shown in the study that prerequisites for performing differential rate analysis for binary rare earths with TBA are that the pseudo-first-order parallel reaction mechanism should be conformed with,no multinuclear complex would be formed and the co-coloration effects could be neglected.展开更多
基金①The project supported by the U.S.Department of Energy.the Robert A.Welch Foundation theNational Natural Science Foundation of China
文摘At 45 MeV/u an experiment on fragmentation of projectile(<sup>20</sup>Ne)on <sup>165</sup>Ho was performed.An average reduced width σ<sub>0</sub> of 84.3±6.6 MeV/c was obtained by separating the break=up of all com-plex fragments of <sup>20</sup>Ne from the evaporation part of compound nucleus in momentum spectra.
文摘Reaction resonance or Feshbach resonance in polyatomic reaction is one of the most fascinating phenomena in chemical reaction dynamics. The HO+CH4→HO+CH3 reaction is one of the pivotal polyato-mic reactions concerned with both the experimental and theoretical scientists. Reaction probabilities and other dynamic properties of this system were calculated with quantum scattering theory method, but a simple QH(v)+HO(j)→Q+H2O(m,n) reaction model was used, in which only three degrees of freedom and the rotating of OH were considered while making CH3 as a pseudo atom. In this paper, by an ab initio method, partial potential energy surface(PPES) was constructed and all the 15 internal degrees-freedom were given. Feshbach resonance mechanism of this reaction can be obtained by the dynamic Eyring Lake on the PPES and the lifetime of the reactive resonance-state can be estimated using the gap of the vibrational energy levels of transient collision complex in the critical transition-state region. Above interesting dynamic properties would not be given by simple pseudo atomic reaction model.
基金The Project was supported by the National Natural Science Foundation of China
文摘The overall reaction was determined on the basis of the dissociation constant of TBA and the ratio of the ligand to the rare earth ion in the complex.The rate law,rate constants and acitivition energies for the reaction of La^(3+),Gd^(3+)and Ho^(3+)with TBA were studied.It is shown in the study that prerequisites for performing differential rate analysis for binary rare earths with TBA are that the pseudo-first-order parallel reaction mechanism should be conformed with,no multinuclear complex would be formed and the co-coloration effects could be neglected.
