31 research outputs found

    High resolution studies of low-energy electron attachment to SF5Cl: Product anions and absolute cross sections

    Get PDF
    Low energy electron attachment to SF5_5Cl was studied at high energy resolution by mass spectrometric detection of the product anions. Two variants of the laser photoelectron attachment (LPA) technique (Kaiserslautern) were used for determining the threshold behaviour of the yield for SF5−_5^- formation at about 1 meV resolution, and to investigate the relative cross sections for Cl−^-, FCl−^-, and SF5−_5^- formation towards higher energies (up to 1 eV) at about 20 meV resolution. Thermal swarm measurements (Birmingham) were used to place the relative LPA cross sections on an absolute scale. A trochoidal electron monochromator (Innsbruck) was used for survey measurements of the relative cross sections for the different product anions over the energy range of 0-14 eV with a resolution of 0.30 eV. Combined with earlier beam data (taken at Berlin, J. Chem. Phys. 88 (1988) 149), the present experimental results provide a detailed set of partial cross sections for anion formation in low-energy electron collisions with SF5_5Cl

    INFRARED SPECTRUM OF THE PRODUCTS OF THE INTERACTION OF EXCITED NEON ATOMS WITH CCl4CCl_{4} TRAPPED IN SOLID NEON

    No full text
    a^{a} G. Maier, H.P. Reisenauer, J. Hu, B.A. Hess, Jr., and L.J. Scha***d, Tetra***ed, Lett, 30, 4105 (1989).Author Institution: National Institute of Standards and TechnologyWhen a Ne:CCl4Ne:CCl_{4} sample is codeposited at approximately 5 K with a beam of neon atoms that have been excited in a microwave discharge, the infrared spectrum of the resulting solid deposit shows prominent absorptions that have previously been assignedaassigned^{a} to Cl2CCl−ClCl_{2}CCl-Cl, as well as other absorptions of uncharged, cationic CCla(n=1−3)CCl_{a} (n= 1-3) and anionic CCln(n=3,4)CCl_{n} (n=3,4) species. Studies of Ne:13CCl4Ne:^{1}3CCl_{4} samples and studies of the photodestruction of the products when the deposit is subjected to various bands of visible and ultraviolet radiation support the proposed assignments

    INFRARED SPECTRUM OF THE INTERACTION OF EXCITED NEON ATOMS WITH NO AND ITS MULTIMERS TRAPPED IN SOLID NEON

    No full text
    a^{a} A. Strobel, N. Knoblauch, J. Agreiter, A.M. Smith, G. Niedner-Schatt***urg, and V.E. Bondybey, J. Phys. Chem. 99, 872 (1995).Author Institution: National Institute of Standards and TechnologyWhen a Ne:NO sample is codeposited at approximately 5 K with a beam of excited neon atoms, the infrared spectrum of the resulting deposit includes absorptions which can be assigned to several ionic products. The close correspondence of transitions observed in the gas-phase photoelectron spectrum of (NO)2a(NO)_{2}^{a} with infrared absorptions previously assigned to trans-ONNO anion requires the reassignment of these absorptions to the cation. Results of detailed studies of the isotopic substitution pattern and photodestruction behavior of other absorptions which may be contributed by (NO)2(NO)_{2} anions will be presented. The possible presence of ionic species of composition (NO)3(NO)_{3} will also be considered

    THE INFRARED SPECTRUM OF H2O2+H_{2}O_{2}^{+} TRAPPED IN SOLID NEON

    No full text
    Author Institution: Optical Technology Division, National Institute of Standards and TechnologyWhen a Ne:H2O2+Ne:H_{2}O_{2}^{+} sample is codeposited at approximately 5 K with a beam of microwave-excited neon atoms, photoionization and Penning ionization of the H2O2H_{2}O_{2} leads to the stabilization of the H2O2+H_{2}O_{2}^{+} cation. Although the energy of the excited neon atoms exceeds that required that required for the formation of HO2+HO_{2}^{+} from H2O2+H_{2}O_{2}^{+}, as has been previously found in photonization studies, the yield of this fragment ion is small. The infrared spectra observed for H2O2+H_{2}O_{2}^{+} and for the deuterium-substituted isotopomers will be compared with those predicted by ab initio calculations

    THE VIBRATIONAL SPECTRA OF MOLECULAR IONS FORMED FROM HBr AND HI AND TRAPPED IN SOLID NEON

    No full text
    Author Institution: National Institute of Standards and Technology, Gaithersburg, MD 20899.When a Ne:HBr or a Ne:HI sample is codeposited at 5 K with a beam of neon atoms that has been excited by a microwave discharge, the solid deposit shows prominent infrared infrared absorptions of the HX+,(HX)2+HX^{+}, {(HX)_{2}}^{+}, and XHX−XHX^{-} ion products. The vibrational spectra of these species and their behavior on subsequent exposure of the deposit to various ranges of visible and ultraviolet radiation are compared with the corresponding properties previously observed for Ne:HCl samples

    INFRARED SPECTRUM OF O3−O_{3}^{-} ISOLATED IN SOLID NEON AND EVIDENCE FOR THE STABILIZATION OF O2⋯O4+O_{2}\cdots{O}_{4}^{+}

    No full text
    Author Institution: Molecular Physics Division, National Institute of Standards and TechnologyWhen a Ne:O3Ne:O_{3} sample is codeposited at approximately 5 K with neon atoms that have been excited in a microwave discharge, the most prominent infrared absorptions of the resulting solid are contributed by trans- and cyc-O4+O_{4}^{+} and by O3−O_{3}^{-}. The failure to detect infrared absorptions of O3+O_{3}^{+} is consistent with the initial formation of that species in one or more dissociative excited states. The ν3\nu_{3} absorption of O3−O_{3}^{-} appears at 796.3cm−1796.3 cm^{-1}, close to its position in earlier argon-matrix experiments in which photoionization of an alkali metal atom provided the electron source and in which diffusion of the atomic cation would result in the stabilization of appreciable M+O3M^{+}O_{3}. The identification of O3−O_{3}^{-} isolated in solid neon is supported by observations of O3−O_{3}^{-} generated from isotopically substituted Ne:O2:N2OO_{2}:N_{2}O samples, also codeposited with excited neon atoms. An upper bound of 810cm−1810 cm^{-1} is estimated for the gas-phase band center of ν3\nu_{3} of O3−O_{3}^{-}. Infrared absorptions which grow on mild warmup of the sample are tentatively assigned to an O2⋯O4+O_{2}\cdots{O}_{4}^{+} complex
    corecore