Production (in Mg Vapor) and Loss (inH2Gas) of 1-to 42-keV/NucleonXΣg+1andcΠu3Hydrogen Molecules

We have investigated collisions which result in the formation and destruction of the $\left(1s{\sigma }^2\right)X{}_{}{}^1{}_{}{}^{}\Sigma _g^{+}{}_{}{}^{}$ ground state and the $\left(1s\sigma 2p\pi \right)c{}_{}{}^3{}_{}{}^{}\Pi _u^{}{}_{}{}^{}$ long-lived electronically excited state of molecular hydrogen. The molecules were formed by electron capture by 1- to 42-keV/nucleon ${\mathrm{H}}_2^{+}$ or ${\mathrm{D}}_2^{+}$ ions in Mg vapor. The resulting yields of ${\mathrm{H}}_2\left({}_{}{}^1{}_{}{}^{}\Sigma _g^{+}{}_{}{}^{}\right)$, ${\mathrm{H}}_2\left({}_{}{}^3{}_{}{}^{}\Pi _u^{}{}_{}{}^{}\right)$, H, and ${\mathrm{H}}^{+}$ are reported as a function of Mg-target thickness. Also reported are cross sections for total loss and ionization of the ${}_{}{}^1{}_{}{}^{}\Sigma _g^{+}{}_{}{}^{}$ and ${}_{}{}^3{}_{}{}^{}\Pi _u^{}{}_{}{}^{}$ states of ${\mathrm{H}}_2$ in collisions with ${\mathrm{H}}_2$ gas.