title: Selective and reversible control of a chemical reaction with narrow-band infrared radiation: HXeCC radical in solid xenon.
abstract: The light-induced H + XeC2 <--> HXeCC reaction is studied in solid Xe, and the full optical control of this reaction is demonstrated. By narrow-band excitation in the IR spectral region, HXeCC radicals can be decomposed to a local metastable configuration and then selectively recovered by resonant excitation of the XeC2 vibrations. The novel recovery process is explained by short-range mobility of the reagents promoted by vibrational energy redistribution near the absorbing XeC2 molecule. This means that a chemical reaction can be selectively promoted in a desired place where the chosen absorber locates. The obtained results make a strong case of solid-state reactive vibrational excitation spectroscopy of weak radiationless transitions.
authors.affiliation: Laboratory of Physical Chemistry, University of Helsinki, P. O. Box 55, FIN-00014, Helsinki, Finland. leonid.khriachtchev@helsinki.fi
authors.forename: Leonid
authors.initials: L
authors.lastname: Khriachtchev
authors.forename: Hanna
authors.initials: H
authors.lastname: Tanskanen
authors.forename: Markku
authors.initials: M
authors.lastname: Räsänen
mesh_terms: D000042:Absorption; D017554:Carbon Compounds, Inorganic / Q000737:chemistry*; D004735:Energy Transfer; D005609:Free Radicals / Q000737:chemistry; D006859:Hydrogen / Q000737:chemistry*; D007259:Infrared Rays; D017785:Photons; D013057:Spectrum Analysis; D014978:Xenon / Q000737:chemistry*
chemical_list: D017554:Carbon Compounds, Inorganic; D005609:Free Radicals; D014978:Xenon; D006859:Hydrogen