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  • 1990-1994  (157)
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  • 1
    Electronic Resource
    Electronic Resource
    Rydberg-atom destruction in collisions with electron attaching targets at low-to-intermediate n (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 285-287 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Semiclassical model calculations of rate constants for Rydberg-atom destruction through electron transfer in collisions between K(nd) atoms and CF3I and SF6 are presented. The calculated rate constants are in good agreement with experimental data, but at low-to-intermediate values of n fall below those expected on the basis of the simple free-electron model. Reasons for this apparent discrepancy are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458475
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  • 2
    Electronic Resource
    Electronic Resource
    Chemi-ionization in K2/BrCN collisions (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 7863-7864 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Ion production in thermal-energy collisions between K2 dimers and BrCN is examined using a novel time-of-flight technique incorporating position-sensitive detection. The reaction channels are identified and the energetics of reaction investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462385
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  • 3
    Electronic Resource
    Electronic Resource
    Use of Rydberg atoms to probe negative ion lifetimes (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 4043-4046 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The lifetimes of the transient negative ions formed during dissociative electron capture by CHCl3 and CCl4 have been investigated through studies of electron transfer in collisions with K(nd) Rydberg atoms. Measurements of the velocity and angular distributions of the product positive and negative ions reveal that transient CHCl−@B|3 ions formed by Rydberg electron attachment to CHCl3 undergo very rapid dissociation. Similar data indicate that CCl−*4 ions formed through Rydberg electron capture by CCl4 have much longer lifetimes, on the order of 10 to 30 psec, consistent with the predictions of RRKM theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458736
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  • 4
    Electronic Resource
    Electronic Resource
    Negative ion production in collisions between K(nd) Rydberg atoms and CF3Br and CF2Br2 (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 1672-1676 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Negative ion production via electron transfer in collisions between K(nd) Rydberg atoms and CF3Br and CF2Br2 has been investigated over a wide range of of n (10≤n≤70). For both species, the major negative ion observed is Br−, although with CF2Br2, a small Br−2 signal is also detected. Kinematic studies show that Br− production via dissociative attachment is accompanied by sizable translational energy release (∼0.35 eV for CF3Br; ∼0.2 eV for CF2Br2). These studies further show that, despite this large energy release, post-attachment interactions between the product ions are important at intermediate values of n(n(approximately-less-than)20) and suggest that the transient CF3Br−@B| and CF2Br2−* ions initially formed by electron capture have quite different lifetimes against dissociation. Cross sections for free-electron attachment to both species are derived from measurements of rate constants for electron transfer at high n. These cross sections are in reasonable agreement with results obtained in free-electron studies using the threshold photoelectron spectroscopy technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458048
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  • 5
    Electronic Resource
    Electronic Resource
    Semiclassical model for analysis of dissociative electron transfer reactions involving Rydberg atoms (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 8669-8675 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Collisions between atoms in high Rydberg states and molecules that dissociatively attach free low-energy electrons can lead to ionization through capture of the excited electron by the target molecule. A Monte Carlo code is described that models the detailed kinematics of such dissociative electron transfer reactions. The model takes into account the velocity distributions of the reactants, the lifetime and decay energetics of the transient intermediate negative ion, and the electrostatic interaction between the product positive and negative ions. Data for CF3I are presented that illustrate how detailed comparisons between model predictions and experimental data can lead to a better understanding of the dynamics of dissociative electron attachment reactions. In particular, such comparisons can provide estimates of the lifetime of the intermediate negative ions and show how the excess energy of reaction is partitioned between translational and internal degrees of freedom in the dissociation process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459253
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  • 6
    Electronic Resource
    Electronic Resource
    Velocity dependence of associative ion production in K (np)–C6H6 collisions (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 184-186 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The velocity dependence of the formation of stable KC6H6+ ions through associative ionization in K(np)/C6H6 collisions has been investigated for values of n in the range 13–25. The data show that the associative ionization rate increases rapidly with decreasing collision velocity. Possible reasons for this are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465787
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  • 7
    Electronic Resource
    Electronic Resource
    The role of inversion transitions in K(150p)/NH3, ND3 collisions (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 2486-2487 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Data for K(150p)/NH3, ND3 collisions are presented showing that near-resonant energy transfer associated with transitions between different inversion levels of the target is an important process leading to collisional state changing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464181
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  • 8
    Electronic Resource
    Electronic Resource
    Use of the Stark effect to minimize residual electric fields in an experimental volume (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 3649-3650 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A technique based on the Stark effect is described that allows the residual electric field in a small experimental volume to be systematically reduced to (approximately-less-than)50 μV cm−1. Although developed initially to allow production of Rydberg atoms in states with very large values of principal quantum number n, it will also permit high resolution studies involving near threshold photoionization or very low-energy free electrons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144246
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  • 9
    Electronic Resource
    Electronic Resource
    Use of capacitance diaphragm gauges at pressures down to 10−6 Torr (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 3279-3281 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The useful range of a capacitance diaphragm gauge is extended down to 1×10−6 Torr with an uncertainty of ±10−7 Torr using computer-based averaging. Gauge linearity is measured by observing the deflection of the diaphragm by the force of gravity. Precise pressure increments are generated by tilting the gauge through a range of accurately measured angles. By this procedure the gauge is observed to be linear to within ±1% plus 10−7 Torr between 1×10−6 and 8×10−3 Torr. Additionally, the deflection of the center of the diaphragm per unit pressure is found to be 2×10−5 m Torr−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144563
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  • 10
    Electronic Resource
    Electronic Resource
    Utilizing the nitrogen content of organic manures on farms—problems and practical solutions (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Soil use and management 9 (1993), S. 0 
    Details
    ISSN: 1475-2743
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract. Organic manures contain valuable quantities of nitrogen, phosphate and potash, but many farmers regard them as ‘waste materials’ rather than as sources of plant nutrients. Utilization of the plant-available nitrogen content is poor at present because of manure management practices which lead to leaching and atmospheric losses. Experiments studying the effect of timing suggest that, in order to decrease nitrate leaching, applications of manures which contain much available nitrogen should not be made during the period September to December on freely draining grassland and arable soils. Spring top dressings of dilute pig or cattle slurries and poultry manures to growing cereal crops are generally more efficient than autumn applications, particularly on freely draining soils. Legislation requiring manures to be applied in an environmentally acceptable manner and the economic need for farmers to realize the nutrient value of organic manures are likely to change the farming industry's perception of manures as ‘waste materials’.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1475-2743.1993.tb00938.x
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