Triple-differential cross sections for single ionization of CO₂ by 100 eV electron impact

Abstract

We present a combined experimental and theoretical study for electron-impact ionization of carbon dioxide (CO 2 ) for the projectile energy E 0 =100 eV. Experimental triple-differential cross sections (TDCS) are obtained using a multi-particle momentum spectrometer (reaction microscope). For projectile scattering angles between −5°and −20°a large part of the full solid angle is covered for the slow ejected electron with energies between 5 and 15 eV. The experimental data are measured for the ionization of the three outer valence molecular orbitals 1π g , 1π u , and 3σ u which lead to a non-dissociating CO 2 + ion. The measured TDCS summed over all three orbitals are internormalized across the scattering angles and ejected electron energies. They are compared to the theoretical results from the multi-center distorted wave (MCDW) approximation, and from the MCDW-WM approximation which includes post-collision interaction using the Ward-Macek factor (WM). Reasonable good agreement is found between the experiment and the MCDW-WM calculations for the angular dependence and the relative magnitude of the cross sections in the coplanar plane, while for the perpendicular and full perpendicular planes larger discrepancies exist. Since post-collision interaction is not considered the MCDW method shows strong discrepancies with experiment for small mutual angles of the two outgoing electrons in the final state.electron impact, ionization, kinematically complete (e, 2e) experiment, CO 2 , MCDW

Electron impact single ionization of hydrogen molecule by twisted electron beam

“…The electron impact ionization study for molecular targets is different from that for atoms because of the molecular configuration of the targets arising from the different molecular orbitals involved [14]. In liter-ature, numerous studies in the (e, 2e) field have been done on various molecules, like H 2 , N 2 , O 2 , H 2 OCO 2 , formic acid, bio-molecules such as DNA, RNA etc [15][16][17][18][19][20][21][22][23].…”

Double and Triple Differential Cross Sections for Single Ionization of Benzene by Electron Impact

“…Then, the momentum transferred by the projectile to the target is given by . Generally, the TDCS can be obtained for the emission of the ionized electron into the full solid angle and is represented, e.g., as a 3D surface [ 27 , 28 ]. In this study, we only consider a cut of the 3D surface, in particular through the projectile scattering plane (xz) (see ref.…”

Electron impact single ionization of hydrogen molecule by twisted electron beam

“…The TDCS for the twisted electron can be computed from equation 2 with T tw f i (κ, K) computed from the equation 24. Since it is difficult to obtain the exact alignment of the Bessel beam with the target, one needs to consider the generalized equation for the Bessel beam given by equation (19), such that The additional factor e −iki•b indicates the complex spatial structure of the Bessel beam contrary to the plane wave [50]. We can get equation ( 19) by just substituting b = 0 in equation ( 27).…”

“…In literature, numerous studies in the (e,2e) field have been done on various molecules, like H 2 , N 2 , O 2 , H 2 O CO 2 , formic acid, bio-molecules such as DNA, RNA etc. [15][16][17][18][19][20][21][22][23].…”