The progress in the quantum coherent controlling of chemical reactions is briefly reviewed. The controlling was firstly realized by modulating the phasa angle between one photon and three photon excitation of some mol...The progress in the quantum coherent controlling of chemical reactions is briefly reviewed. The controlling was firstly realized by modulating the phasa angle between one photon and three photon excitation of some molecules. The fluorescence intensities of atom in gaseous phase or molecules in liquid phase, as well as the dissociation branching of molecules were also controlled by self optimizing the phase and the amplitude of an ultrafast laser pules. Some new possible propress of coherent control may appearin strong laser field, in condense phase or on catalysts.展开更多
The reaction of vinyl radicals with oxygen was investigated by Time-Resolved Fourier Transform infrared emission spectroscopy. The radicals were produced by the pulsed laser photolysis of C2H3Br at 248 nm. Vibrational...The reaction of vinyl radicals with oxygen was investigated by Time-Resolved Fourier Transform infrared emission spectroscopy. The radicals were produced by the pulsed laser photolysis of C2H3Br at 248 nm. Vibrationally excited products of H2CO（v1）, HCO（v3）, CO2（v3, v）, CH3（v3）, C2H2（v3）, HO2（v1）, C2H2O2（v3+v11）, CO（v） formed in the C2H3+O2 reaction have been observed. Four elementary reaction channels have been verified.展开更多
Copper-sulfur cluster ions were produced by laser ablation on solid samples: (1) a mixture of copper and sulfur powder, (2) cuprous sulfide compound, (3)cupric suffide compound, respectively. Two main series of cluste...Copper-sulfur cluster ions were produced by laser ablation on solid samples: (1) a mixture of copper and sulfur powder, (2) cuprous sulfide compound, (3)cupric suffide compound, respectively. Two main series of cluster ions were found: (a)[Cu(Cu2S)n]+(n=0-22), (b) [(Cu2S)n]+(n=1-18). The main photodissociation channels of the cluster ions were neutral losses of Cu2S, Cu or CuS. It is obvious that the Cu2S unit plays an important role in the formation and structure of the Cu/S cluster ions, and farthermore, the mied d10 shell eletronic configuration of copper element might be critical to the characteristic of the cluster ions.展开更多
The mechanisms of the CH2＋ O2→ H2O＋ CO and CH2＋ O2→ H2＋ CO2 reactions have been studied by performing ab initio CAS(8,8)/6-31G(d,p) calculations, and five intermediates(IMn) and eight transitions(TSn) have been ...The mechanisms of the CH2＋ O2→ H2O＋ CO and CH2＋ O2→ H2＋ CO2 reactions have been studied by performing ab initio CAS(8,8)/6-31G(d,p) calculations, and five intermediates(IMn) and eight transitions(TSn) have been located along the reaction paths. The predicted path for the CH2＋ O2→ H2O＋ CO is: CH2＋ O2→ TS1→ IM1→ TS2→ IM2→ TS3→ IM3→ TS4→ IM4a→ TS5→ H2O＋ CO. For the CH2＋ O2→ H2＋ CO2 reaction, there are two paths: (i) CH2＋ O2→ TS1→ IM1→ TS2→ IM2→ TS3→ IM3→ TS6→ H2＋ CO2 and (ii) CH2＋ O2→ TS1→ IM1→ TS2→ IM2→ TS3→ IM3→ TS4→ IM4a→ TS7→ IM4b→ TS8→ H2＋ CO2, with the latter path more favorable energetically.展开更多
The elementary reaction of C2H3＋ NO has been reported for the first time in this paper.C2H3 radical was produced by laser photolysis of vinyl bromide at 248 nm.Vibrationally excited reaction products H2CO,NCO and HCN...The elementary reaction of C2H3＋ NO has been reported for the first time in this paper.C2H3 radical was produced by laser photolysis of vinyl bromide at 248 nm.Vibrationally excited reaction products H2CO,NCO and HCN were observed.Two exothermic reaction channels leading to HCN＋ H2CO and CH3＋ NCO are identified.展开更多
文摘The progress in the quantum coherent controlling of chemical reactions is briefly reviewed. The controlling was firstly realized by modulating the phasa angle between one photon and three photon excitation of some molecules. The fluorescence intensities of atom in gaseous phase or molecules in liquid phase, as well as the dissociation branching of molecules were also controlled by self optimizing the phase and the amplitude of an ultrafast laser pules. Some new possible propress of coherent control may appearin strong laser field, in condense phase or on catalysts.
文摘The reaction of vinyl radicals with oxygen was investigated by Time-Resolved Fourier Transform infrared emission spectroscopy. The radicals were produced by the pulsed laser photolysis of C2H3Br at 248 nm. Vibrationally excited products of H2CO（v1）, HCO（v3）, CO2（v3, v）, CH3（v3）, C2H2（v3）, HO2（v1）, C2H2O2（v3+v11）, CO（v） formed in the C2H3+O2 reaction have been observed. Four elementary reaction channels have been verified.
文摘Copper-sulfur cluster ions were produced by laser ablation on solid samples: (1) a mixture of copper and sulfur powder, (2) cuprous sulfide compound, (3)cupric suffide compound, respectively. Two main series of cluster ions were found: (a)[Cu(Cu2S)n]+(n=0-22), (b) [(Cu2S)n]+(n=1-18). The main photodissociation channels of the cluster ions were neutral losses of Cu2S, Cu or CuS. It is obvious that the Cu2S unit plays an important role in the formation and structure of the Cu/S cluster ions, and farthermore, the mied d10 shell eletronic configuration of copper element might be critical to the characteristic of the cluster ions.
文摘The mechanisms of the CH2＋ O2→ H2O＋ CO and CH2＋ O2→ H2＋ CO2 reactions have been studied by performing ab initio CAS(8,8)/6-31G(d,p) calculations, and five intermediates(IMn) and eight transitions(TSn) have been located along the reaction paths. The predicted path for the CH2＋ O2→ H2O＋ CO is: CH2＋ O2→ TS1→ IM1→ TS2→ IM2→ TS3→ IM3→ TS4→ IM4a→ TS5→ H2O＋ CO. For the CH2＋ O2→ H2＋ CO2 reaction, there are two paths: (i) CH2＋ O2→ TS1→ IM1→ TS2→ IM2→ TS3→ IM3→ TS6→ H2＋ CO2 and (ii) CH2＋ O2→ TS1→ IM1→ TS2→ IM2→ TS3→ IM3→ TS4→ IM4a→ TS7→ IM4b→ TS8→ H2＋ CO2, with the latter path more favorable energetically.
文摘The elementary reaction of C2H3＋ NO has been reported for the first time in this paper.C2H3 radical was produced by laser photolysis of vinyl bromide at 248 nm.Vibrationally excited reaction products H2CO,NCO and HCN were observed.Two exothermic reaction channels leading to HCN＋ H2CO and CH3＋ NCO are identified.
