(e,2e)study of Ca in coplanar symmetric geometry

Abstract

The triple differential cross section of Ca͑4s 2 ͒ is calculated by using the distorted wave Born approximation with exchange and with exchange and post-collision interaction. The calculations have been carried out at different impact energies ͑4 -58.5 eV above the first ionization potential of Ca͒. The present calculations are in close agreement with the recent ͑e ,2e͒ experimental studies ͓A. J. Murray, Phys. Rev. A. 72, 062711 ͑2005͔͒. The calculations show an improvement in agreement with the experiment as compared with the earlier theoretical works.

Calculations for electron impact ionization of Be atoms and its charged states, Be+and Be2+

“…Beryllium also belongs to the family of alkaline earth metals and, following helium, it is the most important closed shell atom. Differential cross section results, experimental as well as theoretical, have been reported for the other higher Z member of the alkaline earth metals such as Mg [29][30][31] and Ca [32][33][34]. To the best of our knowledge, there are no differential cross section data available for the electron impact single ionization of the alkaline earth metal beryllium.…”

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

“…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.…”

“…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].…”

Angular distributions for the electron-impact single ionization of sodium and magnesium

“…A comprehensive set of measured angular distributions is now available for electron-impact ionization of alkali metals [10,11] and noble gases [12]. Recent theoretical studies include convergent close-coupling calculations for Na [13], distorted-wave Born approximation calculations for Na [14][15][16][17], K [14], Ca [15], and Mg [16], and B-spline R-matrix calculations for Ar [18,19] and Ne [20].…”