Experimental and theoretical study of the triple-differential cross section for electron-impact ionization of thymine molecules

Comment on “Experimental and theoretical study of the triple-differential cross section for electron-impact ionization of thymine molecules”

“…3 of Ref. [1]) the TDCS shows a single binary lobe centered close to the momentum transfer direction with a small shift of approximately 5 • to larger ejected-electron angles. As the TDCS provides the most detailed information of an ionization process, it is impossible for a simple method like FBA to reproduce all the features of an (e,2e) experiment.…”

“…Bellm et al [1] performed difficult (e,2e) experiments on inner valence orbitals of thymine at an incident energy of 250 eV and an ejected-electron energy of 20 eV. The difficulties are due to the measurements of inner valence orbitals of thymine which are very closely spaced in energy.…”

“…Thus one may assume that these differences are small for the molecular wave functions too. It is well worth noting that the experiment of Bellm et al [1] suffers from one drawback: all the measured data are relative.…”

“…In the section of theoretical framework Bellm et al [1] write that in their work on the (e,2e) experiment with coplanar asymmetric kinematics, the Coulomb Born approximation, also referred to as the first Born approximation (FBA), is completely justified. It is not quite true, because we notice that at the scattering angle of 10 • (see Fig.…”

Comment on “Dynamical (e, 2e) studies using tetrahydrofuran as a DNA analog” [J. Chem. Phys. 133, 124302 (2010)]

“…1) and several biomolecules, including formic acid (CHOOH), 2 tetrahydrofuran (THF), 3 pyrimidine, 4 and thymine. 5 Triple differential cross sections (TDCSs) of these molecules were measured under the asymmetric coplanar geometry with the incident energy of 250 eV at scattering angles θ 1 from −5…”