TY - JOUR
T1 - Experimental triple-differential cross sections for electron-impact ionization of 1-methyl-5-nitroimidazole at 97-eV impact energy
AU - Mootheril, Deepthy Maria
AU - Gong, Maomao
AU - Ren, Xueguang
AU - Castillo, Carlos Guerra
AU - Chen, Xiangjun
AU - Garcia, Gustavo
AU - Pfeifer, Thomas
AU - Dorn, Alexander
N1 - Publisher Copyright:
© 2025 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Open access publication funded by Max Planck Society.
PY - 2025/6
Y1 - 2025/6
N2 - We present the triple-differential cross sections (TDCSs) for electron-impact single ionization of a potential radiosensitizer molecule, 1-methyl,5-nitroimidazole (C4H5N3O2), at an impact energy of 97 eV. The experiment was done using a momentum spectrometer, a so-called reaction microscope, employing the (e,2e+ion) coincidence technique. Modifications of the existing experimental setup to incorporate a vapor target produced from a solid sample are described. Experimental results are compared with the multicenter three-distorted-wave model. The post-collision interaction (PCI) effects are included using the Ward-Macek approximation in the multicenter three-distorted-wave Ward-Macek model. Both experimental and theoretical TDCSs include contributions from the first five valence orbitals which lead to the formation of the parent C4H5N3O2+ ion. Qualitative agreement between the theory and the experiment is obtained. The prominent π character of the ionized orbitals is evident in both results, along with indications of PCI effects and multiple scattering at the ionic potential, manifested as significant out-of-plane electron emissions.
AB - We present the triple-differential cross sections (TDCSs) for electron-impact single ionization of a potential radiosensitizer molecule, 1-methyl,5-nitroimidazole (C4H5N3O2), at an impact energy of 97 eV. The experiment was done using a momentum spectrometer, a so-called reaction microscope, employing the (e,2e+ion) coincidence technique. Modifications of the existing experimental setup to incorporate a vapor target produced from a solid sample are described. Experimental results are compared with the multicenter three-distorted-wave model. The post-collision interaction (PCI) effects are included using the Ward-Macek approximation in the multicenter three-distorted-wave Ward-Macek model. Both experimental and theoretical TDCSs include contributions from the first five valence orbitals which lead to the formation of the parent C4H5N3O2+ ion. Qualitative agreement between the theory and the experiment is obtained. The prominent π character of the ionized orbitals is evident in both results, along with indications of PCI effects and multiple scattering at the ionic potential, manifested as significant out-of-plane electron emissions.
UR - https://www.scopus.com/pages/publications/105007427030
U2 - 10.1103/PhysRevA.111.062807
DO - 10.1103/PhysRevA.111.062807
M3 - 文章
AN - SCOPUS:105007427030
SN - 2469-9926
VL - 111
JO - Physical Review A
JF - Physical Review A
IS - 6
M1 - 062807
ER -