Resonance Laser Ionization Spectroscopy Of Selenium

Photoionization spectra of Se have been studied by step-wise resonance laser ionization. The Rydberg series 4s(2)4p(3)(S-4)np(3)P(0,1)(,2) and 4s(2)4p(3)(S-4)np(5)P(1)(,2,3) were measured via different excitation schemes. Using the Rydberg series 4s(2)4p(3)(S-4)np(3)P(2) with n = 15-49, the ionization potential of Se was determined with improved precision to 76,658.15(2)(stat)(4)(sys) cm(-1), which resolved the discrepancy in previous literatures. Autoionizing (AI) spectra between the IP and two neighboring converging limits of the Se ionic states 4s(2)4p(3)(D-2(3/2)) and 4s(2)4p(3)(D-2(5/2)) were obtained. In total eight AI Rydberg series have been observed, measured and assigned.