The Formation of Se2-: A New Resonance Raman Feature in the Photochemistry of Zeolite-Encapsulated Selenium

摘要: This Raman spectroscopic study on selenium incorporated in Nd−Y zeolite presents new aspects of the photochemistry selenium. The formation Se2- radical anion has been established from its resonance spectrum, consisting ten almost equidistant bands between 328 and 3220 cm-1 low-energy side 476.24-nm laser excitation line. derived constants electronic ground state are ω0 = x0ω0 0.71 cm-1. Another broad band at 260 resembles features spectra amorphous chain structures encapsulated zeolites. Continuous irradiation sufficiently high power levels leads to depletion a simultaneous enhancement bands. These observations discussed with respect defect states conventionally invoked for reversible photoinduced changes