Rydberg states of SiCl

A fluorescence spectrum, excited by the synchrotron radiation of Superaco i n a microwave discharge through He + SiCl4 leads to the observation of five new electronic states of SiCl, converging to the ground X(1)Sigma(+) state of the SiCl+ ion. The (n s sigma) and (n p pi) Rydberg series are extended respectively to n = 6 and,n = 7, A new ionization limit is observed in abs orption at 11.238 eV corresponding to the a(3)Pi electronic state of SiCl+. Four new states are observed which converge to that limit. (C) 1999 Academ ic Press.