THE VIBRATIONAL-SPECTRA OF MOLECULAR-IONS ISOLATED IN SOLID NEON .13.IONS DERIVED FROM HBR AND HI

When a Ne:HBr or a Ne:HI sample is codeposited at approximately 5 K wi th discharge-excited neon atoms, the infrared spectrum of the resultin g solid includes not only the absorptions of the HX molecule and its m ultimers but also a prominent absorption of HBr+ or HI+. The absorptio n of each of the two cations lies within a few cm(-1) of its gas-phase band center. The vibrational fundamentals of DBr+ and DI+ are also id entified in experiments on deuterium-enriched samples. Other infrared absorptions are assigned to normal and deuterium-substituted (HBr)(2)( +) and (HI)(2)(+), as well as to BrHBr-, BrDBr-, and IHI-. Studies of changes in the absorption spectrum following exposure of the deposit t o filtered visible and near ultraviolet radiation support these assign ments and provide further information on photodissociation and photode tachment processes occurring in these systems. (C) 1996 American Insti tute of Physics.