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  • 1
    Digitale Medien
    Digitale Medien
    Fluorescence yields from photodissociative excitation of formic acid, methyl formate, and acetic acid in the vacuum-ultraviolet region (1988)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 92 (1988), S. 3764-3768 
    Details
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/j100324a015
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  • 2
    Digitale Medien
    Digitale Medien
    Transient signals induced by laser irradiation of negative ions in hollow electrode discharges of Cl2 and HCl in N2 (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 2649-2656 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A technique for sampling negative ions in hollow-cathode and hollow-anode discharges of strongly electronegative gases is presented. The negative ions were mass analyzed to be Cl−, Cl−2, and Cl−3 for the discharge of Cl2/N2 mixture and Cl− for HCl/N2. The dependence of negative ion intensity on gas pressure and discharge voltage was investigated. Photodetachment of negative ions was used to induce photoelectron transient signals that probe ion concentrations. The transient signal indicates that negative ions originate in discharge, but not in the mass-analyzer region. Time dependence of the negative ion signal induced by laser irradiation was measured by a quadrupole mass analyzer and used to study the kinetics of charged particles responsible for the transport of laser-induced perturbation. The observed negative ion transient signal is a useful means for studying negative ion kinetics in plasma.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.346490
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  • 3
    Digitale Medien
    Digitale Medien
    Reaction rate constants of NO+(a)+NO and Ar++NO measured by an optical detection method (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 7893-7900 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The NO γ emission is observed from the reaction of NO+(a)+NO. The emission provides a new detection method for studying the NO+(a) reaction kinetics at thermal energy without electric field. The NO+(a) is produced by photoionization of NO at 76.5 nm as well as by the reaction of Ar++NO, where Ar+ is also produced by photoionization of Ar. The vibrational population distributions of NO(A) resulted from the ion–molecule reactions are measured and used to discuss the mechanisms for the production of the emission. The reaction rate constants are determined from the decay rates of the emission intensity as a function of time. The reaction rate constants of NO+(a)+NO and Ar++NO at room temperature are measured to be (5.8±0.7)×10−10 and (2.1±1.0)×10−10 cm3/s, respectively. The reaction rate constant of NO+(a)+Ar at thermal energy is estimated to be about 10−12 cm3/s.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.460124
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  • 4
    Digitale Medien
    Digitale Medien
    Fluorescence from photoexcitation of CF3X (X=H, Cl, and Br) at 50–106 nm (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 133-139 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The photoabsorption and fluorescence cross sections of CF3H, CF3Cl, and CF3Br are measured in the 50–106 nm region using synchrotron radiation. Fluorescence spectra from photoexcitation of these molecules are dispersed to identify the emitting species to be mainly the excited CF@B|2, CF*3, and CF3X+*, but not CF+@B|3. The fluorescence excitation function of CF3X (X=F, H, Cl, or Br) is generally divided into three excitation bands; each band produces a specific excited species. The fluorescence yields of the studied molecules are determined and correlated with dissociation thresholds and ionization potentials. The excited ion states that may emit are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.458482
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  • 5
    Digitale Medien
    Digitale Medien
    Emission spectra of SiF3 (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 2834-2835 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Emission spectra of SiF3 radical were observed from photodissociative excitation of SiF4 at 99.1, 95.5, and 92.3 nm. The spectra show a broad visible band in the 350–800 nm region, a UV band in 290–340 nm, and a weak band in 240–280 nm. The visible band resembles the chemiluminescence spectra observed from etching of silicon by F or XeF2.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.455935
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  • 6
    Digitale Medien
    Digitale Medien
    Quantitative absorption and fluorescence spectroscopy of Cd(CH3)2 in vacuum ultraviolet (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 160-165 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Photoabsorption and fluorescence cross sections of Cd(CH3)2 were measured in the 115–270 nm region using synchrotron radiation as a light source. Vibrational structures superimposing on absorption continua were observed in the 140–230 nm region. Fluorescence appears at excitation wavelengths shorter than 184 nm. Fluorescence produced at 123.6, 147, and 157.5 nm was dispersed to identify the emission to be mainly from excited Cd (326.1 nm). Emissions from excitation of Cd(CH3)2 at 157, 193, and 248 nm via a multiphoton excitation process were investigated.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.455499
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  • 7
    Digitale Medien
    Digitale Medien
    Fluorescence from photoexcitation of BCl3 at 45–106 nm (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 2036-2040 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The photoabsorption, fluorescence cross sections, and the fluorescence yield of BCl3 are measured in the 45–106 nm region. Fluorescence spectra are dispersed to identify the emitting species. The emission observed at excitation wavelengths longer than 96 nm is attributed to the excited BCl@B|2. The BCl (A–X) emission appears at excitation wavelengths shorter than 97.5 nm. Emissions observed at the thresholds of 88 and 81 nm are attributed to the excited BCl+*3 (C¯ 2A‘2 and D¯ 2E') states, respectively. Emissions from excited B* atoms appear in the 48–64 nm region. In the 88–96 nm region the maxima and minima of the fluorescence cross section are complimentary with those of the BC1+3 ionization yield, indicating where superexcited state(s) exist that decay through competitive channels of fluorescence and autoionization.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.457063
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  • 8
    Digitale Medien
    Digitale Medien
    Fluorescence from photoexcitation of C2H2 at 50–106 nm (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 4000-4007 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The photoabsorption and fluorescence cross sections of C2H2 were measured in the 50–106 nm region using synchrotron radiation as a light source. Fluorescence observed at several excitation wavelengths was dispersed to identify the fluorescing species that are excited C2H*, C@B|2 , CH*, H*, and possibly C2H+*2 . The photodissociation process of C2 H2 leading to the formation of fluorescing species is discussed. The C2 (C–A) emission observed at 92.3 and 95.5 nm is produced by the molecular elimination process associated with superexcited state(s). Fluorescence spectra from the two-photon excitation of C2 H2 at 157.5 and 193 nm were also observed and compared with those of single-photon excitation at the equivalent excitation energies.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.455810
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  • 9
    Digitale Medien
    Digitale Medien
    Rate constant of the gas phase reaction of SO3 with H2O (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 4853-4860 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The rate constants for the reaction of SO3 with H2O in He and in N2 were measured at total pressures from 1–10 Torr in a flow tube at room temperature. The concentration of SO3 was monitored by photofragment emission produced by 147 nm excitation. Dependencies of apparent reaction rates on wall conditions and reaction tube sizes were investigated. At total He pressures of 1–10 Torr, a value of (5.7±0.9)×10−15 cm3 /s was obtained for the upper limit of the homogeneous gas phase reaction rate constant. This rate value is more than two orders of magnitude lower than the previously published value, but it is consistent with the theoretical calculation provided in this paper.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.455680
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  • 10
    Digitale Medien
    Digitale Medien
    CH(A, B–X ) fluorescence from vacuum ultraviolet excitation of CH3 (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 2797-2802 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: CH3 was produced by the reaction of Cl or F with CH4 in a flow tube. The CH(A 2Δ, B 2Σ−–X 2Πr) fluorescence was observed from photoexcitation of CH3 at 157 nm by a single-photon excitation process and at 193 nm by two-photon excitation. No emission was detected at 248 nm. The fluorescence cross section at 157.5 nm was estimated to be about 8×10−19 cm2 with an uncertainty of factor 3. The CH2 emission is negligibly weak. The photodissociation process for the absorption continua of CH3 is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.455033
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