Triple differential cross section in collisions for atomic potassium

Study of (e, 2e) process on potassium at 6 eV–60 eV above threshold in a second-order Born approximation

“…In Fig. 1 we display the present DWB2 calculations (solid curve) of coplanar symmetric (e, 2e) processes for K (4s), along with experimental data of Murray [6] (solid circles) as well as previous first-order DWBA calculations of Khajuria et al with MSCEP and PCI [9] (dotted curve; not available for E 1 (E 2 ) at 10 eV and 20 eV) and Purohit et al with polarization potential and PCI [10] (dashed curve). All the results are normalized to unity at their maximum points, respectively, and are presented on a logarithmic scale for the convenience of comparison.…”

“…[7−10] The PCI effect was included through the angle-dependent effective charge model [7] or a Gamow factor. [9,10] The polarization potential was introduced as a function of the electron density parameter. [8,10] Either the spin averaged static exchange potential (SASEP) [8,10] or the modified semiclassical exchange potential (MSCEP) [9] was employed to consider the electron exchange effect of the target.…”

“…[9,10] The polarization potential was introduced as a function of the electron density parameter. [8,10] Either the spin averaged static exchange potential (SASEP) [8,10] or the modified semiclassical exchange potential (MSCEP) [9] was employed to consider the electron exchange effect of the target. These modified first-order DWBA calculations showed reasonable improvement for the agreement with the experimental measurements compared with the standard DWBA calculation.…”

Triple differential cross section in (e, 2e) collisions for sodium in a coplanar symmetric geometry

“…Subsequently, some modified theoretical models for the above physical effects have been introduced in the calculations to describe the experimental ionization differential cross section of Na, K, Mg, and Ca [16][17][18][19][20][21][22][23][24][25], and much attention has been paid to Na [16][17][18][19]. Srivastava et al reported their study on TDCS of Na together with K by DWBA method [16].…”

“…They found the introduction of the new correction in MSCEP resulted in a further weakening of the attractive interaction and produced very good agreement between the theoretical and experimental data for electron-methane collision at low incident energies. Since then the MSCEP has been used in the DWBA method to calculate the TDCS for the different atomic targets [21][22][23][29][30][31]. These studies indicated that the DWBA calculations with MSCEP generally gave better description to the experimental results than those with SASEP.…”