Measurement of the cross section for charge transfer into the statesH(3s)andH(4s)forH+andD+incident onH2,N2, andO2

The energy dependence of the cross section for charge transfer into the $\mathrm{H}\mathrm{}\left(3s\right)\mathrm{}$ and $\mathrm{H}\mathrm{}\left(4s\right)\mathrm{}$ states for ${\mathrm{H}}^{+}$ and ${\mathrm{D}}^{+}$ incident on ${\mathrm{H}}_2$, ${\mathrm{N}}_2$, and ${\mathrm{O}}_2$ exhibits deviation from the form $\sigma =A{e}^{-Ka\frac{\left|\Delta E\right|}{h\nu }}$ predicted by the adiabatic criterion in the range 1.2-8.2 keV. Analysis of the present data and other previously reported cross sections for protons incident on Ar, He, and Ne reveal some secondary maxima in the $2s$, $3s$, and $4s$ cross sections. Correlations between the structure in these cross sections and maxima in the total and $2p$ cross sections suggest intermediate-state coupling as an explanation for the observed structure.