Laser spectroscopy is a very useful and well-known technique aimed at giving characteristics of a gas phase molecule such as ionization energies, quantum states, structural information and so on. While many results for neutral states of molecules give quite resolved spectra and are investigated thoroughly, it is difficult to find out information about cation due to the complication of many electronic states. We developed a vacuum ultraviolet pulsed-field ionization combined with photo-fragment excitation technique (PFI-PHOFEX) to overcome low resolved spectra for cationic states. First, we make and select ground state of cation by using the pulsed-field ionization or mass-analyzed threshold ionization (MATI)1 techniques. This cation is then photodissociated by another laser to give photo-fragment. Excited electronic states and structures of the cation are revealed by detecting fragments in our scheme. The new technique provides the detailed information about the bound-bound transition of the cation in general.
Monday, 28 April 2008
The identification of molecular intrinsic properties: High resolution ionization spectroscopy for the molecular cation in the gas phase
Han Songhee
Laser spectroscopy is a very useful and well-known technique aimed at giving characteristics of a gas phase molecule such as ionization energies, quantum states, structural information and so on. While many results for neutral states of molecules give quite resolved spectra and are investigated thoroughly, it is difficult to find out information about cation due to the complication of many electronic states. We developed a vacuum ultraviolet pulsed-field ionization combined with photo-fragment excitation technique (PFI-PHOFEX) to overcome low resolved spectra for cationic states. First, we make and select ground state of cation by using the pulsed-field ionization or mass-analyzed threshold ionization (MATI)1 techniques. This cation is then photodissociated by another laser to give photo-fragment. Excited electronic states and structures of the cation are revealed by detecting fragments in our scheme. The new technique provides the detailed information about the bound-bound transition of the cation in general.
Laser spectroscopy is a very useful and well-known technique aimed at giving characteristics of a gas phase molecule such as ionization energies, quantum states, structural information and so on. While many results for neutral states of molecules give quite resolved spectra and are investigated thoroughly, it is difficult to find out information about cation due to the complication of many electronic states. We developed a vacuum ultraviolet pulsed-field ionization combined with photo-fragment excitation technique (PFI-PHOFEX) to overcome low resolved spectra for cationic states. First, we make and select ground state of cation by using the pulsed-field ionization or mass-analyzed threshold ionization (MATI)1 techniques. This cation is then photodissociated by another laser to give photo-fragment. Excited electronic states and structures of the cation are revealed by detecting fragments in our scheme. The new technique provides the detailed information about the bound-bound transition of the cation in general.
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