Abstract
An Ar target to which Cs vapor could be added, excited by a pulsed beam of 100-MeV [sup 32]S ions, was studied as a prototype ion-atom charge-transfer system for pumping short-wavelength lasers. Low-velocity Ar[sup 2+] ions were efficiently produced; a huge increase in the intensity of the Ar II 4[ital d]-4[ital p] spectral lines was observed when Cs vapor was added to the argon. This observation is explained by a selective charge transfer of the Cs 6[ital s] electron into the upper levels of the observed transitions. A rate constant of (1.4[plus minus]0.2)[times]10[sup [minus]9] cm[sup 3]/s for the transfer process was determined.
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