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 sub-process 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 P5+, 8+, 11+ ions with H2/He targets, in case of K-shell excitation. It is found that, the peak values of σRTEX are 2.58×l0-21 cm2, 2.82×10-21 cm2 and 3.02×10-21 cm2 at projectile energies 119.10 MeV, 118.13 MeV and 108.74 MeV for P5++H2, P8++H2 and P11++H2 collisions, respectively.
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