Possible two-electron excitations in C3+ following 1 MeV/u collisions with atomic targets; Z = 2, 10, 18 and 36

Auger electrons emitted from Li-like carbon projectiles excited during 1 MeV/u collisions with atomic targets (Z = 2, 10, 18 and 36) have been measured. As a function of the target Z, we observe the yields of singly and doubly excited autoionizing (AI) configurations of C3+ excited during the collision that decay to the {1s2(1S)+eclc}2L ground state. The investigation focuses on Auger electrons emitted with energies between 220 and 260 eV in the projectile reference frame. In addition to the singly excited (1s2s2l)2L AI configurations expected from projectile 1s electron excitation, doubly excited states to the {1s(2p2)1D}2D and {1s(2p2)1S}2S are also observed with increasing intensities in going from He to the higher Z targets. If the 2D and the 2S peaks are the result of two-electron excitations, it may be possible to investigate this aspect of the collision using some of the recent approaches taken in studying the excitations of the two electrons in He targets. (orig.)