TY - JOUR
T1 - (e, e+ion) study on electron-induced dissociative ionization of O2
AU - Watanabe, Noboru
AU - Yamada, So
AU - Takahashi, Masahiko
N1 - Funding Information:
This research was supported by the JSPS KAKENHI Grants No. 15H03761, No. 18H01932, and No. 25248002. It was also supported in part by the Management Expenses Grants for National Universities Corporation and the Cooperative Research Program of “NJRC Mater. & Dev.”.
Publisher Copyright:
© 2019 American Physical Society.
PY - 2019/2/13
Y1 - 2019/2/13
N2 - Electron-induced dissociative ionization of O2 has been investigated by means of (e,e+ion) spectroscopy. The linear momenta of the fragment ions have been measured in coincidence with electron energy-loss spectra for O2 at scattering angles of 2.2a, 4.2a, and 8.2a using an incident energy of 1.4 keV. From the analysis of the data, partial ion yield spectra have been obtained for the BΣ2, {cΣ4+2Σ2+2Σ4}, {2Σ2+2Σ4}, and 3Σ2 ionization, allowing us to assess state-specific momentum-transfer dependence of the relative ionization cross sections. It has been shown that the shape resonance in the BΣ2 channel is substantially suppressed by the contributions of electric nondipole transitions. To get insight into the stereodynamics in the electron-O2 collision processes, the angular distributions of the fragment ions have been examined. It has been revealed that the (e,e+ion) cross section for the 2σg→1πg autoionization band exhibits a characteristic angular distribution reflecting the anisotropic shape of the molecular orbital to which the target electron is excited.
AB - Electron-induced dissociative ionization of O2 has been investigated by means of (e,e+ion) spectroscopy. The linear momenta of the fragment ions have been measured in coincidence with electron energy-loss spectra for O2 at scattering angles of 2.2a, 4.2a, and 8.2a using an incident energy of 1.4 keV. From the analysis of the data, partial ion yield spectra have been obtained for the BΣ2, {cΣ4+2Σ2+2Σ4}, {2Σ2+2Σ4}, and 3Σ2 ionization, allowing us to assess state-specific momentum-transfer dependence of the relative ionization cross sections. It has been shown that the shape resonance in the BΣ2 channel is substantially suppressed by the contributions of electric nondipole transitions. To get insight into the stereodynamics in the electron-O2 collision processes, the angular distributions of the fragment ions have been examined. It has been revealed that the (e,e+ion) cross section for the 2σg→1πg autoionization band exhibits a characteristic angular distribution reflecting the anisotropic shape of the molecular orbital to which the target electron is excited.
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U2 - 10.1103/PhysRevA.99.022704
DO - 10.1103/PhysRevA.99.022704
M3 - Article
AN - SCOPUS:85061529114
SN - 2469-9926
VL - 99
JO - Physical Review A
JF - Physical Review A
IS - 2
M1 - 022704
ER -