The photoionization and photodissociative ionization processes of p-nitrotoluene(C,H,NO,) have been studied using the photoionization mass spectrometry wlth synchrotronradiation(SR) as the light source- The ionization...The photoionization and photodissociative ionization processes of p-nitrotoluene(C,H,NO,) have been studied using the photoionization mass spectrometry wlth synchrotronradiation(SR) as the light source- The ionization potential (PI) of p-nitrotoluene and eightappearance potentials(P.) of the ionic fragment from the SR photodissociative ionization ofC:H:NO, have been measured. Based on the mass spectra of C,H:NO, obtained with SR pho-tolonization and the relationship of energy in the processes, the most possible channels ofphotodissociative ionization of p-nltrotoluene have been analyzed.展开更多
The photoionization efficiency curve (PIE) of C2H3Cl+ formation from C2H3Cl hasbeen measured in wavelength region 105.0- 130.0nm, by using synchrotron radiation single- photonionization and a quadrupole mass spectrome...The photoionization efficiency curve (PIE) of C2H3Cl+ formation from C2H3Cl hasbeen measured in wavelength region 105.0- 130.0nm, by using synchrotron radiation single- photonionization and a quadrupole mass spectromemter as a detector. A series of peaks in region 106.0-117.0nm arise from Rydberg autoionization converging to A2A’ state of the vinyl chloride ion, theaverage quantum defects are δ(ns) = 1.87, δ(np) = 1.51,δ(nd) = 0.22 respectively. The Rydbergtransitions of π(2a") → 4d, π(2a") →5d, π(2a")→6s, π(2a") →7s have been assigned also.展开更多
The vacuum ultraviolet photoionization spectrum of Si(CH3)2Cl2 has been obtained with synchrotron radiation source. The adiabatic iomzation potential of Si(CHa)2Cl2 is 10.62±0.03eV (0.37eV lower than reported by ...The vacuum ultraviolet photoionization spectrum of Si(CH3)2Cl2 has been obtained with synchrotron radiation source. The adiabatic iomzation potential of Si(CHa)2Cl2 is 10.62±0.03eV (0.37eV lower than reported by PES), and the appearance potentials for Si(CH3)Cl2, Si(CH3)2Cl+, SiCH3+ and SiCl+ are 11.25±0.03eV,12.69±0.04eV, 15. 1±0.1eV and 21.16eV±0.1eV respectively. From these results, we estimate D(Si(CH3)Cl2+-CH3)=0.631±0.03eV and D(Si(CH3)2Cl+-Cl))=2.07±0.04eV.展开更多
The photoionization and photodissociation of bromoethane have been studied by using synchrotron radiation.The photoionization efficiency (PIE) curves of some fragments ions are measured.Based on these curves,the ioniz...The photoionization and photodissociation of bromoethane have been studied by using synchrotron radiation.The photoionization efficiency (PIE) curves of some fragments ions are measured.Based on these curves,the ionization potential of C 2H 5Br is determined to be 10.29eV,and the appearance potentials of C 2H 5 + ,CH 2Br +are measured to be 10.60eV,13.2eV respectively.We also have performed G2MP2 calculation on these fragments.According to experimental result and G2MP2 energy,the enthalpy of formation of ions C 2H 5 +,CH 2Br +,C 2H 5Br +,the bond energy of D 0(C 2H 5 +-Br),D 0(-Br),D 0(CH 2Br +-CH 3) have been evaluated.The most possible channels of the dissociation photoionization have been analyzed.展开更多
The 6H-pyridine clusters have been studied by the TOF mass spectrometry,the VUV from synchrotron rediation and the molecular beam technique three-type clusters are observed in the VUV photoionization mass spectroscopy...The 6H-pyridine clusters have been studied by the TOF mass spectrometry,the VUV from synchrotron rediation and the molecular beam technique three-type clusters are observed in the VUV photoionization mass spectroscopy: Pn+(n=2-5,P stands for6H-pyridine molecule), PnH+ (n=2-4) and Pn (H2O)m+(n=4,5, m=1;n=6, m=1,2). ThePnH+ clusters may have the chain structure,the Pn+ and Pn(H2O)m+ clusters may havethe cyclic structures, all of these are formed by the hydrogen-bond.展开更多
文摘The photoionization and photodissociative ionization processes of p-nitrotoluene(C,H,NO,) have been studied using the photoionization mass spectrometry wlth synchrotronradiation(SR) as the light source- The ionization potential (PI) of p-nitrotoluene and eightappearance potentials(P.) of the ionic fragment from the SR photodissociative ionization ofC:H:NO, have been measured. Based on the mass spectra of C,H:NO, obtained with SR pho-tolonization and the relationship of energy in the processes, the most possible channels ofphotodissociative ionization of p-nltrotoluene have been analyzed.
文摘The photoionization efficiency curve (PIE) of C2H3Cl+ formation from C2H3Cl hasbeen measured in wavelength region 105.0- 130.0nm, by using synchrotron radiation single- photonionization and a quadrupole mass spectromemter as a detector. A series of peaks in region 106.0-117.0nm arise from Rydberg autoionization converging to A2A’ state of the vinyl chloride ion, theaverage quantum defects are δ(ns) = 1.87, δ(np) = 1.51,δ(nd) = 0.22 respectively. The Rydbergtransitions of π(2a") → 4d, π(2a") →5d, π(2a")→6s, π(2a") →7s have been assigned also.
文摘The vacuum ultraviolet photoionization spectrum of Si(CH3)2Cl2 has been obtained with synchrotron radiation source. The adiabatic iomzation potential of Si(CHa)2Cl2 is 10.62±0.03eV (0.37eV lower than reported by PES), and the appearance potentials for Si(CH3)Cl2, Si(CH3)2Cl+, SiCH3+ and SiCl+ are 11.25±0.03eV,12.69±0.04eV, 15. 1±0.1eV and 21.16eV±0.1eV respectively. From these results, we estimate D(Si(CH3)Cl2+-CH3)=0.631±0.03eV and D(Si(CH3)2Cl+-Cl))=2.07±0.04eV.
文摘The photoionization and photodissociation of bromoethane have been studied by using synchrotron radiation.The photoionization efficiency (PIE) curves of some fragments ions are measured.Based on these curves,the ionization potential of C 2H 5Br is determined to be 10.29eV,and the appearance potentials of C 2H 5 + ,CH 2Br +are measured to be 10.60eV,13.2eV respectively.We also have performed G2MP2 calculation on these fragments.According to experimental result and G2MP2 energy,the enthalpy of formation of ions C 2H 5 +,CH 2Br +,C 2H 5Br +,the bond energy of D 0(C 2H 5 +-Br),D 0(-Br),D 0(CH 2Br +-CH 3) have been evaluated.The most possible channels of the dissociation photoionization have been analyzed.
文摘The 6H-pyridine clusters have been studied by the TOF mass spectrometry,the VUV from synchrotron rediation and the molecular beam technique three-type clusters are observed in the VUV photoionization mass spectroscopy: Pn+(n=2-5,P stands for6H-pyridine molecule), PnH+ (n=2-4) and Pn (H2O)m+(n=4,5, m=1;n=6, m=1,2). ThePnH+ clusters may have the chain structure,the Pn+ and Pn(H2O)m+ clusters may havethe cyclic structures, all of these are formed by the hydrogen-bond.
