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  • 1
    Electronic Resource
    Electronic Resource
    Kinetics and dynamics of vibrationally state resolved ion–molecule reactions: 14N+2(v=1 and 2) and 15N+2(v=0, 1, and 2) with 14N2 (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 6359-6367 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Vibrationally state-selected measurements of the kinetics and dynamics of 14N+2(v=1 and 2) and 15N+2(v=0, 1, and 2) in collisions with 14N2 are made using a selected ion flow tube (SIFT), laser induced fluorescence (LIF) technique at thermal energies. Kinetics are measured by monitoring the LIF signal amplitudes of N+2(v) as a function of 14N2 concentration, added after ion injection. By comparison with the known N+2(v=1)+Ar rate, the 15N+2(v=0)+14N2 rate constant is found to be one-half of the Langevin collision rate, or 4.2±0.2×10−10 cm3 molecule−1 s−1. This suggests that the reaction proceeds via an N+4 energized adduct in which charge is shared on a time scale shorter than the adduct lifetime. The removal rates of 14N+2(v=1 and 2) reactions by 14N2 are also found to proceed at one-half of the Langevin collision rate. Thus product channels that remove vibrational energy from the ion upon dissociation of the adduct account for 50% of the collision probability. The removal rates of 15N+2(v=1 and 2) with 14N2 are 21%–26% faster than those for 14N+2(v=1 and 2); this is attributed to the channel that cannot be observed in collisions of 14N+2(v) with 14N2 in which both charge and vibrational energy are transferred between the collision partners. This pathway is also observed directly by the appearance of 14N+2(v=1 and 2) product states. For this channel to proceed, vibrational energy transfer between the two highest frequency modes of the N+4 energized adduct must occur on a time scale comparable to the adduct lifetime.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467097
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  • 2
    Electronic Resource
    Electronic Resource
    Reaction between hydroxyl (deuteroxyl) radicals and carbon monoxide at temperatures down to 80 K: experiment and theory (1993)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 97 (1993), S. 12254-12259 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100149a027
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  • 3
    Electronic Resource
    Electronic Resource
    Energy Transfer in the 31214151 Fermi Resonant States of Acetylene. 2. Vibrational Energy Transfer (1995)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 99 (1995), S. 1094-1100 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100004a007
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  • 4
    Electronic Resource
    Electronic Resource
    Energy transfer in the 31,214151 Fermi-resonant states of acetylene. I. Rotational energy transfer (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 8572-8579 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: An infrared–ultraviolet double resonance technique is used to probe the state-to-state rotational energy transfer dynamics of self-relaxation in acetylene. The output of an optical parametric oscillator at ∼3 μm is used to excite C2H2 to a rotational level within one of its Fermi-resonant 31,214151 states. By fixing this wavelength and scanning the frequency-doubled output of a tunable dye laser, laser induced fluorescence signals arising from collisional population of rotational levels within both dyads are observed and state-to-state rate constants for rotational relaxation are obtained. Rotational relaxation to J levels within the pumped (upper energy) Fermi-dyad accounts for 74% of the total rate of loss of the population of the J=12 level, whereas relaxation to J levels in its partner accounts for only 16%. A further 7% of the absolute rotational relaxation rate is accounted for by vibrational relaxation out of the mixed levels, leaving only 3%–4% of the total relaxation to be accounted for.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464517
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  • 5
    Electronic Resource
    Electronic Resource
    Direct observation of the simultaneous transfer of vibrational energy and charge in the 15N2+(v)+14N2 reaction (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 5993-5995 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In this Communication, we report the use of a mass-selected flow tube, laser-induced fluorescence technique for the study of vibrationally excited ions. Using this technique, we have made measurements on the reaction of 15N2+ (v=2) with 14N2, which show conclusive evidence for the simultaneous transfer of vibrational energy and charge. We believe this to be the first direct observation of such a channel in charge transfer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464862
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  • 6
    Electronic Resource
    Electronic Resource
    A selected ion flow tube-laser induced fluorescence instrument for vibrationally state-specific ion-molecule reactions (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 2808-2820 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A selected ion flow tube apparatus is coupled with laser induced fluorescence (LIF) detection for the selective monitoring of ion vibrational states and their reactions. Mass selected ions are injected into a flow tube with a venturi inlet using He carrier gas. A 200 Hz dye laser system provides sensitive LIF detection of the injected ions at densities as low as 1×105 cm−3 for N+2. The rotational temperatures of the N+2 ions are estimated to be ≈300 K using the LIF detection, while the vibrational temperatures can be high and may be varied by the injection potentials. Vibrationally state-selected ion-molecule reactions of N+2(v=0, 1, and 2) are studied with N2, Ar, and O2 at thermal kinetic energies (Elab〈0.1 eV), where translation-to-vibration energy transfer is negligible. Isotopically specific charge-transfer reactions of 15N+2(v) with 14N2 are also studied. The ability to mass select ions and characterize their vibrational states and those of their reaction products allows novel studies of state-to-state ion chemistry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144367
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  • 7
    Electronic Resource
    Electronic Resource
    Kinetic measurements on the system: 2NO2 = N2O4 at (224 ± 2) K using time-resolved infrared laser absorption (1988)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 20 (1988), S. 957-965 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Direct kinetic measurements have been made on the reaction: 2NO2 = N2O4. Equilibrium mixtures of NO2 and N2O4 at (224 ± 2) K were perturbed by flash photolysis of a fraction of the N2O4. The rate of relaxation back to equilibrium was monitored by observing the transmittance of the 14P(11) line from a cw CO laser selected to coincide with the v9 band of N2O4. Measurements were made in the presence of 350-750 torr of He, N2, or CF4. Within this limited pressure range, the kinetics were consistent with third-order behavior with the following rate constants (cm3 molecule-1 s-1): k0 = (2.4 ± 0.5) × 10-34 [He]; (1.0 ± 0.1) × 10-33 [N2]; (1.8 ± 0.3) × 10-33 [CF4].
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550201204
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