Charge-State Dependence ofK-Shell-Vacancy Production Cross Sections in Slow Ion-Atom Collisions

Abstract

$K$-shell-vacancy production cross sections in Ne→C${\mathrm{H}}_4$, ${\mathrm{N}}_2$, ${\mathrm{O}}_2$, Ne and N→C${\mathrm{H}}_4$, ${\mathrm{N}}_2$, ${\mathrm{O}}_2$, Ne collisions are measured for incident charge states $1^{+}$ to $4^{+}$ and $1^{+}$ to $3^{+}$, respectively, in the projectile energy range 50 to 500 keV. The data indicate there is a real deviation between experiment and the calculations of rotational-coupling cross sections. The data suggest that the deviations are not due to a nonstatistical distribution of the $2p$ vacancies among the $2p\pi$ molecular orbital or a velocity-dependent coupling $N\left(v\right)\mathrm{}$ as has been previously assumed.