RESONANT TRANSFER EXCITATION CROSS SECTIONS FORPHOSPHORUS IONS WITH K-SHELL EXCITATION

摘要

Resonant charge transfer and excitation (RTE) is an interestingprocess in ion-atom (I/A) collisions, which proceed through the formation ofdoubly-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 coolingand ionization balance in thermal astrophysical and laboratory plasma. Infact, some intensive and extensive theoretical and experimental works havebeen done. However, many works still needed to understand the intricaciesand the trends of this process for various isoelectronic and isonuclearsequences. The RTEX process in I/A collisions is identical to the dielectronicrecombination (DR) in electron-ion (e/I) collisions. The DR and RTEX crosssections have been proved, Brandt (1983), that they are mathematicallyrelated. In the present work, The RTEX cross sections are calculated for thecollision of P~(5+,8+,11+)ions withH_2/He targets, in case of K-shell excitation. Itis found that, the peak values of σ~(RTEX)are 2.58x10~(-21)cm~2, 2.82x10~(-2and3.02x10~(-21)cm~2at projectile energies 119.10 MeV, 118.13 MeVand 108.74MeV for P~(5+)+H_2 collisions,respectively.