Polarization Degrees for 3p 2P3/2–3s 2S1/2 Transition of C3+ (1s23p) Produced in Collisions of C4+ with He and H2

Abstract

Charge transfer processes in collisions of C 4+ with ground-state He and H 2 are investigated using the two-center atomic orbital close-coupling method. Total and state-selective single-electron capture cross sections are obtained for collision energies between 1 and 7 keV/amu, and comparison with available experimental data reveals a good agreement. The polarization degrees for the 3 p 2 P 3/2 –3 s 2 S 1/2 transition of C 3+ (3 p 2 P 3/2 ) are calculated from the magnetic substate-selective cross sections, in which the cascade effects are also included. The polarization degree in the C 4+ +H 2 collisions varies smoothly in the considered energy region and generally agrees with the experimental measurements, while if appears minimum at a collision energy of 2 keV/u for C 4+ +He collisions. By studying the time-evolution of electron capture dynamics in the two systems we have found that the polarization difference between the two systems is caused mainly by interactions at relatively small internuclear dis...