title: Absorption spectra in the vacuum ultraviolet region of small molecules in condensed phases.
abstract: With radiation from a synchrotron we measured the spectra of several small molecular species, in the solid phase at 10K, either pure--O2, NO, CO2, N2O, H2O and NH3--or, for NH3, also dispersed in Ar at molar ratio 1/250, from the onset of absorption in the ultraviolet region until the limits of transmission by crystalline LiF or solid Ar. In a quantitative treatment of spectral data, we fitted the total absorption profile divided by wavenumber to Gaussian curves of minimal number, and made tentative assignments of electronic transitions and vibrational structure by comparison with spectra of gaseous species. These results illuminate the nature of electronic spectra of samples in solid phases in the vacuum ultraviolet region.
authors.affiliation: National Synchrotron Radiation Research Center, 101 Hsinn-Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan.
authors.forename: Hsiao-Chi
authors.initials: HC
authors.lastname: Lu
authors.forename: Hong-Kai
authors.initials: HK
authors.lastname: Chen
authors.forename: Bing-Ming
authors.initials: BM
authors.lastname: Cheng
authors.forename: J F
authors.initials: JF
authors.lastname: Ogilvie
mesh_terms: D000042:Absorption; D000641:Ammonia / Q000737:chemistry; D001128:Argon; D002245:Carbon Dioxide / Q000737:chemistry; D004563:Electrochemistry / Q000379:methods; D004581:Electronics; D009569:Nitric Oxide / Q000737:chemistry; D016011:Normal Distribution; D010100:Oxygen / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet / Q000379:methods*; D013696:Temperature; D014466:Ultraviolet Rays; D014867:Water / Q000737:chemistry
chemical_list: D014867:Water; D002245:Carbon Dioxide; D009569:Nitric Oxide; D001128:Argon; D000641:Ammonia; D010100:Oxygen