VISIBLE AND NEAR UV PHOTON SPECTROSCOPY OF CHARGE-EXCHANGE COLLISIONSBETWEEN AR7+ AND LI AT 105 KEV

Charge exchange collisions at 105 keV between Ar7+ ions and lithium at oms have been studied by photon spectroscopy in the 2000-6000 angstrom wavelength range. A large number of new lines in Ar VII have been ide ntified with the help of ab initio pseudo-relativistic Hartree-rock ca lculations taking into account electrostatic interactions between 3snl (n = 6-10), 3pnl (n = 4-6) and 3dne (n = 4) configurations. They corr espond to transitions 3snl-3sn'l' with n = 7, 8, 9 and DELTAn = 1 and 2. Lines in Ar VI were also observed and identified as transitions 3s2 nl-3s2n'l' and 3s3pnl-3s3pn'l' (n = 6, 7) and DELTAn = 1.