Lyman-Alpha Emission Cross Sections forH2+andD2+Collisions with the Rare Gases

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Cross sections for the emission of Lyman-alpha radiation resulting from ${\mathrm{H}}_{2}^{+}$-and ${\mathrm{D}}_{2}^{+}$-rare-gas collisions have been measured in the energy range from 1 to 25 keV. Excited states of the H or D atoms which decay via the $2p\ensuremath{-}1s$ Lyman-alpha transition result from charge transfer to antibonding states of the ${\mathrm{H}}_{2}$ or ${\mathrm{D}}_{2}$ molecules or from direct excitation to antibonding states of the molecular-ion projectiles. The ${\mathrm{D}}_{2}^{+}$ cross sections are similar to those for ${\mathrm{H}}_{2}^{+}$ when plotted at equivalent projectile velocities. The results are compared with earlier measurements of the Lyman-alpha emission cross sections resulting from ${\mathrm{H}}^{+}$ and ${\mathrm{D}}^{+}$ collisions with rare gases and with the total charge-transfer cross sections for the ${\mathrm{H}}_{2}^{+}$-rare-gas systems.