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  • 1
    Electronic Resource
    Electronic Resource
    Reactivity induced by complex formation: The reaction of O(3P) with HCl dimers (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 2627-2633 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The reaction of O(3P) with HCl⋅M (M=HCl, Ar) complexes has been studied. While the monomer HCl, in its ground vibrational state, reacts extremely slow with O(3P), it is shown here that the van der Waals complexes react with an efficiency of about 3 orders of magnitude larger than that of the monomer. The reactivity of DCl, on the other hand, is not enhanced by the complex formation. Molecular dynamics simulation indicates that the collision complex lifetime increases by several orders of magnitude due to the existence of the "third body" in the cluster. A model for explaining the complex induced enhancement of reactivity is presented and is supported by ab initio calculations. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.473411
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  • 2
    Electronic Resource
    Electronic Resource
    The reaction of O(1D) with H2O, D2O monomers and clusters and the intracomplex reaction in N2O–X2O (X=H,D) photo-initiated at 193 and 212.8 nm (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 111 (1999), S. 4025-4031 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The reaction of O(1D) with water and water clusters was re-examined. We monitored the nascent product state distributions in the reaction photo-initiated by the dissociation of N2O at 193 and 212.8 nm, and the corresponding photo-initiated intracluster reaction. The study at two different dissociation wavelengths and the use of D2O allowed us to obtain direct information on the effect of initial collision kinetic energy on the energy distribution in the product. Based on the new results obtained we conclude that the reaction of O(1D) with water occurs through abstraction mechanism with a relatively short lived collision complex. In the case of the intracluster reaction, we have indication that more internal energy is deposited in the N2 moiety, compared to the dissociation of an isolated N2O. In addition the results indicate that the reaction between the oxygen atom and the water in the complex involved the formation of a short lived collision complex, with a lifetime of probably only few rotations of OH. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.479704
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  • 3
    Electronic Resource
    Electronic Resource
    The role of three dimensional structure in electron transmission through thin organic layers (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 107 (1997), S. 1288-1290 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In this work we probe the effect of the three dimensional structure of the medium on the efficiency of electron transmission (ET) through it, and demonstrate that all three dimensions are playing a crucial role in the ET through thin films. By producing Langmuir–Blodgett layers from two type of amphiphiles we could vary the order in the plane perpendicular to the direction of electron propagation. It was found that the order in this plane affects the low energy electron transmission efficiency. The results are explained by the long wavelength associated with the low energy electrons. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.474476
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  • 4
    Electronic Resource
    Electronic Resource
    Production of OH by dissociating ozone–water complexes at 266 and 355 nm and by reacting O(1D) with water dimers (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 1941-1943 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In the present study the production of OH was monitored when ozone water complexes were dissociated at 266 and 355 nm and when O(1D) atoms were reacted with water dimers. The results indicate that the absorption of ozone at 355 nm is enhanced by two orders of magnitude when the ozone is complexed with water. In addition it is shown that the rotational energy distribution of the OH product is very similar when it is produced in an intracluster process, or by reaction of O(1D) with water dimers. The results are rationalized by complex induced potential energy surfaces shift. The shifts may strongly depend on the relative conformation of the water and the ozone in the complex. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468760
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  • 5
    Electronic Resource
    Electronic Resource
    A source of cold molecular ions for Coulomb explosion imaging (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 3569-3574 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A specialized ion source for use in the high voltage terminal of an electrostatic accelerator has been developed to produce vibrationally cold beams of molecular ions. A pulsed valve is used to produce a supersonic expansion of the source gas which is ionized by electron impact near the beginning of the free expansion. Because of the harsh electromagnetic environment in the terminal, special care has been taken to protect the electronic components related to the ion source. The effect of vibrational cooling in the supersonic expansion is demonstrated using Coulomb explosion techniques with a He2+ beam.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143766
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  • 6
    Electronic Resource
    Electronic Resource
    The reaction of O(3P) with NO clusters (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 3825-3829 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The reaction of O(3P) with NO clusters, NO/Ar, NO/He, and NO/CO2 have been studied in a crossed-beam experiment. Both angular distribution and velocity of the chemiluminescent NO2 product were measured. An isotropic distribution was found for (NO)2, while NOAr yielded forward peaking of the scattered products. These results were rationalized based on the lifetime of the collision complex. The upper limits for the NO–NO and the NO–Ar bonds were found to be 6.3±1 and 1.4±0.3 kJ/mol, respectively. The NO ⋅ CO2 complexes did not react to produce electronically excited NO2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450094
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  • 7
    Electronic Resource
    Electronic Resource
    The reactions of O(1D) with CH4 and C3H8 monomers and clusters (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 4500-4508 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Reactions of O(1D) with hydrocarbon monomers and clusters were investigated via a cross molecular beam experiment applying laser induced fluorescence for the detection of the OH product. The translational, vibrational, rotational, spin–orbit, and Λ-doubling state populations were analyzed. Based on this information the mechanisms for the reactions of O(1D) with methane, propane, and their clusters were established. Nonstatistical distributions are observed even for the reaction of large clusters and are discussed in terms of nonadiabatic effects induced by the long lived collision complex.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466049
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of a single solvent atom on bimolecular reactions: Collisions of O(3P) with hydrocarbon–argon clusters (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 2941-2946 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The reaction between an O(3P) atom and a hydrocarbon molecule weakly bound to an argon atom was studied by classical trajectory simulations. The results are compared to those obtained for the reaction of a free hydrocarbon. A simplistic model system was constructed in which the hydrocarbon was represented as a pseudodiatomic molecule. Although simple, the model reproduced correctly the internal energy distribution in the OH produced in the reaction of the free species. It was found that the OH, produced from the reaction of the van der Waals complex, emerges with less internal energy and less translational energy than the OH from the monomeric process. In the case of the complexed reagents, the collision complex lifetime is longer and the oxygen explores portions of the potential energy surface that are not available in the monomeric reaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464122
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  • 9
    Electronic Resource
    Electronic Resource
    Rotational relaxation in a free expansion of HCl (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 4423-4428 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The rotational relaxation of HCl in a free jet expansion was studied in a pump-and-probe experiment using infrared laser excitation and resonant multiphoton ionization detection. Rate constants were determined for various J to J' energy transfer processes in the vibrationally excited molecule. There is a strong indication that the rotational energy transfer occurs via a near-resonant dipole–dipole interaction between vibrationally excited and vibrationally cold HCl molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462833
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  • 10
    Electronic Resource
    Electronic Resource
    The structures of C2H+ and C2H+2 as measured by Coulomb explosion imaging (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 6377-6387 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The structures of ethynyl and acetylene cations were investigated utilizing the Coulomb explosion imaging method. The geometrical probability density functions for the bending modes were obtained for the protonated and deuterated forms of each species. Detailed analyses of the data reveal that both the measured linear equilibrium geometries and the observed extent of the correlated bending vibrations agree with ab initio calculations for C2H+2 and C2D+2. C2H+ and C2D+ are found to be linear, but the extent of the bending amplitudes are by far larger than the corresponding theoretical predictions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460316
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