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  • 1
    Electronic Resource
    Electronic Resource
    Reaction cross section and product ion time-of-flight measurements for collisions of N+ and N+2 with CO2 at suprathermal energies (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 7780-7786 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Charge exchange and dissociative ionization cross sections are reported for N+–CO2 and N+2–CO2 collisions at center-of-mass energies between 2 and 40 eV. Product ion kinetic energies are measured using time-of-flight techniques. Energy resonance considerations based on CO2 ionization Franck–Condon factors predict charge exchange to be slow for both of these reaction pairs. The N+–CO2 charge exchange, however, exhibits a large cross section and proceeds about one order of magnitude faster than the N+2–CO2 charge exchange. The formation of CO+ in N+–CO2 collisions is reported, while no dissociative ionization products are observed in the N+2–CO2 system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459358
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  • 2
    Electronic Resource
    Electronic Resource
    Cross section and product time-of-flight measurements of the reaction of N+2 with H2O and D2O at suprathermal energies (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 1117-1125 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Charge exchange and hydrogen atom pickup cross sections, and product ion time-of-flight measurements are reported for N+2 –H2O(D2O) collisions at center-of-mass collision energies ranging between 1 and 15 eV. No isotope effect is detected for the charge exchange branch, while a significant isotope effect is observed for the atom pickup reaction. Throughout the measured energy range, the time-of-flight measurements show that the H2O+(D2O+) charge exchange product is produced with near-thermal energy in the laboratory frame, implying little or no momentum transfer. The charge exchange reaction products are therefore formed with internal energy comparable to the exothermicity of the reaction (2.96 eV). The atom pickup ion product velocity distributions and the atom pickup isotope effect are consistent with a spectator stripping mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458173
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  • 3
    Electronic Resource
    Electronic Resource
    Cross sections and product kinetic energy analysis of H2O+–H2O collisions at suprathermal energies (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 3196-3206 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The reaction of H2O+ with H2O is studied using a longitudinal geometry double mass spectrometer in the collision energy range Ec.m.=0.5–25 eV. Cross sections are reported for oxonium ion (H3O+) production and the symmetric charge exchange. Isotopic substitution is used to discern the product branches, including the separation of the two channels for oxonium ion production: (i) proton transfer to the target molecule; and (ii) atom pickup by the primary ion. The largest branching ratio is observed for the charge exchange channel, where no isotope effect is detected in the investigated energy range. Proton transfer exhibits the second largest branching ratio and accounts for more than 90% of the oxonium ion production throughout the measured energy range. The proton transfer cross section is dependent on isotopic substitution, while the atom pickup channel is too weak to make a distinct statement on its isotopic behavior. Product ion energies, determined by time-of-flight measurements, are also reported for each of the three channels. These measurements show that most (〉95%) of the oxonium ions are formed via a direct, spectator stripping type mechanism while a small amount of reaction products exhibit considerable internal excitation. The charge exchange secondary ions are primarily formed at near-thermal energies in the laboratory frame. Small amounts of high laboratory energy product ions are also observed which at least partly originate through the dissociation of excited oxonium ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458852
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  • 4
    Electronic Resource
    Electronic Resource
    Chemiluminescence measurements of the N+2, N++H2O charge transfer systems at suprathermal energies: Direct probe of the dynamics of large cross section charge transfer processes (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 9189-9191 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The chemiluminescence from suprathermal N+2–H2O and N+–H2O collisions is studied using a new experiment. Intense H2O+A˜ 2A1–X˜ 2B1 emission is observed from the N+2 +H2O charge transfer whereas no emissions are detected from the N+–H2O system. OH A 2Σ+–X 2Π emission originating from the N+2+H2O atom pickup channel is also observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459208
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  • 5
    Electronic Resource
    Electronic Resource
    Guided-ion beam measurements of X++NO (X=Ar, N2) reactions (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 7348-7359 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Cross section and product ion time-of-flight measurements are presented for the X++NO (X=Ar, N2) collision systems over a collision energy range of 0.1–20 eV (c.m.). The experiments are carried out in an octopole guided-ion beam apparatus. Charge transfer is the main channel observed and dissociative charge-transfer products are observed for collision energies equal to or greater than their respective thermodynamic thresholds. A weak channel leading to ArN+ and/or ArO+ is observed in the X=Ar system. The charge-transfer cross sections of the two collision systems are similar in magnitude and have approximately an E−1/2 dependence at near-thermal collision energies. The near-thermal cross sections are significantly less than the Langevin–Gioumousis–Stevens predictions for a reaction mediated by ion–induced dipole interactions and complex formation. The time-of-flight distributions of the Ar+, N+2+NO charge-transfer products are characteristic of near-resonant charge-transfer processes. At all collision energies studied, the charge-transfer reaction is dominated by a direct mechanism, but below 1 eV, the formation of a long-lived intermediate complex is also significant. The results are discussed in relation to statistical models and to constraints imposed by requirements of energy resonance and Franck–Condon overlap in charge-transfer reaction dynamics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466879
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  • 6
    Electronic Resource
    Electronic Resource
    Guided-ion beam measurements of N++H2O charge-transfer and chemical reaction channels (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 5656-5665 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Guided-ion beam measurements of N++H2O charge-transfer and chemically reactive channels are presented for collision energies ranging from 0.1 eV to 20 eV c.m. The charge-transfer reaction is not as efficient as expected considering the favorable Franck–Condon overlap at resonance. The analysis of product-ion time-of-flight spectra demonstrates that energy transfer is efficient in orbiting collisions at all investigated collision energies. At low collision energies, formation of NO+, and HNO+ and/or NOH+, is observed. The chemically reactive channels exhibit a near 1/ET dependence at low collision energies. Above 0.5 eV, the HNO+/NOH+ cross section drops abruptly below the instrumental sensitivity. The NO+ cross section exhibits a minimum at 1.2 eV, followed by an increase in cross section with energy reaching a maximum of 4×10−16 cm2 at 7 eV before decreasing again. The decline at higher energies is partly attributed to a dissociative loss of the product ions. O+ formation is observed at and above the thermodynamic threshold associated with the O++N+2H asymptotic limit.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467275
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  • 7
    Electronic Resource
    Electronic Resource
    Fast Metal-Atom Generation by Laser Vaporization of Cu, Zn, and Ni Compounds (1994)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 98 (1994), S. 11931-11941 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100097a020
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  • 8
    Electronic Resource
    Electronic Resource
    Reactions of hydrazine with atomic oxygen(1+) and other ions at suprathermal energies (1992)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 96 (1992), S. 4210-4217 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100190a021
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  • 9
    Electronic Resource
    Electronic Resource
    Observation of CH A→X, CN B→X, and NH A→X emissions in gas-phase collisions of fast O(3P) atoms with hydrazines (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 8297-8301 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Optical emissions in single-collision reactions of fast (20 eV laboratory translational energy) O(3P) atoms with hydrazine, methylhydrazine, and 1,1-dimethylhydrazine have been measured in a crossed-beams geometry. The emissions were observed in the wavelength range 325–440 nm, and were identified as the CH (A 2Δ→X 2Πr) (for methylhydrazine), CN (B 2Σ+→X 2Σ+) (for methylhydrazine), and NH (A 3Π→X 3Σ−) transitions (for all three hydrazines). The experimental vibration-rotation bands were fit to a synthetic spectrum of CH, CN, and NH with given vibrational and rotational temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468095
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  • 10
    Electronic Resource
    Electronic Resource
    Ionization potentials of CaF and BaF (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 622-627 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Although the alkaline earth–monohalide compounds, MX, have been extensively studied, their ionization potentials to MX+ are only known to within a few tenths of an eV. Using an improved electron impact ionization potential measurement to assist in arranging spectroscopic vibronic band origins into Rydberg series, we report high precision ionization potential measurements for CaF and BaF to be IP(CaF)=5.8270±0.0006 eV and IP(BaF)=4.8034±0.0004 eV. The synergism between the electron impact method and the spectroscopic method is detailed, and the minimum accuracy required of the electron impact data is assessed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466923
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