Abstract
Resonant charge transfer and excitation-(RTE) is an interesting process in ion-atom (I/A) collisions, which proceed through the formation of doubly-excited (d) states. If d-states stabilize by emission of x-rays, the subprocess is known as RTEX. This RTEX process is responsible for self cooling and ionization balance in thermal astrophysical and laboratory plasma. In fact, some intensive and extensive theoretical and experimental works have been done. However, many works still needed to understand the intricacies and the trends of this process for various isoelectronic and isonuclear sequences. The RTEX process in I/A collisions is identical to the dielectronic recombination (DR) in electron-ion (e/I) collisions. The DR and RTEX cross sections have been proved, Brandt (1983), that they are mathematically related.
In the present work, The RTEX cross sections are calculated for the collision of P-5+,P-8+,P-11+ ions with H-2/He targets, in case of K-shell excitation. It is found that, the peak values of sigma(RTEX) are 2.58x10(-21) cm(2), 2.82x10(-21) cm(2) and 3.02x10(-22) cm(2) at projectile energies 119.10 MeV, 118.13 MeV and 108.74 MeV for P5++ H-2, P8++ H-2 and P11++H-2 collisions, respectively.