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  • 1
    Electronic Resource
    Electronic Resource
    Fourier transform linewidths measurements in NH3 in the vibrational ground state (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 5373-5376 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have measured linewidths of several pure rotational transitions in the vibrational ground state in the far infrared (80–200 cm−1 ). The experiments were conducted by using a Fourier transform spectrometer and gases (NH3 diluted by H2 or He) contained in a 15 cm absorption cell at room temperature. The aim of our study is to discuss the vibrational effect by comparing our measurements with those done in the infrared, 3 and 6 μm regions (ν3 and ν4 bands) and to find evidence for vibrational dependence. The measured pressure broadening cross sections were typically found to be 26 A(ring)2 for the NH3 –H2 collisions and 16 A(ring)2 for the NH3 –He collisions, by comparing these values with those obtained for the ν4 mode, 35 A(ring)2 for the H2 perturber and 17 A(ring)2 for the He perturber, we see a vibrational effect for the NH3 –H2 collisions but not significant for the NH3 –He ones. Our measurements are in good agreement with the theoretical calculations done by Billing by using the semiclassical coupled states method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455588
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  • 2
    Electronic Resource
    Electronic Resource
    Pressure broadening and cross relaxation of ammonia perturbed by hydrogen and helium: Implications on intermolecular potentials and discussion of rotational effects (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 1551-1556 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The study of the absorption line profiles in the infrared region (6–7 μm), by means of a diode laser spectrometer and a FT spectrometer in ammonia diluted in He and H2 at room temperature, allowed us to determine pressure broadening cross section and the intradoublet inelastic rate (due to molecular inversion).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454134
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  • 3
    Electronic Resource
    Electronic Resource
    Electron attachment in HBr and HCl (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 8303-8309 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Studies of electron attachment in HBr and HCl gases at low temperatures have indicated that attachment to clusters of these gases can become efficient even though attachment to the monomers is endothermic and exhibits very low attachment rates. A complementary measurement of the reaction of OH radicals with HBr has enabled us to establish a lower limit for the rate of electron attachment to HBr clusters of approximately 10−8 cm3 s−1. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1367376
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  • 4
    Electronic Resource
    Electronic Resource
    Collision induced fragmentation of small ionic argon clusters (2002)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 117 (2002), S. 1497-1506 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The mechanisms of collision induced fragmentation of small Arn+ (n=2–9) clusters are investigated in the 100 eV center-of-mass energy range. The velocity vectors of the fragments are measured in a multicoincidence experiment for two- and three-body fragmentation. The relative role of the two basic dynamics, electronic transitions, and momentum transfer in binary collisions is evaluated. The structure of the clusters deeply influences the type of mechanism. This is clearly the case of Ar3+ for which a specific impulsive process called "diatom" mechanism plays an important part in the fragmentation of one isomer. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1485067
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  • 5
    Electronic Resource
    Electronic Resource
    Collision induced fragmentation of small ionic alkali clusters. III. Heteronuclear clusters (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 179-186 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Fragmentation of small heteronuclear NapKn–p+ clusters (n=3–7, p=0–2) induced by collision with helium atoms is investigated at a laboratory energy of 4800 eV. Populations of the various fragmentation pathways are measured. Detailed analysis of the collision is performed with a multicoincidence technique allowing the determination of the velocity vectors of the fragments. Fragmentation is predominantly induced by momentum transferred in binary collisions between He and alkali cores, electronic excitation accounting only for about 10% of the process. Experiments with heteronuclear clusters allow the study of the various fragmentation mechanisms following the initial momentum transfer. Two-step fragmentation processes are governed by the endothermicity of the pathway while direct ejection of an alkali atom in binary collisions is directly dependent on the relative number of Na and K cores. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1329894
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  • 6
    Electronic Resource
    Electronic Resource
    Direct kinetic measurements on reactions of atomic carbon, C(3P), with O2 and NO at temperatures down to 15 K (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 112 (2000), S. 8466-8469 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A CRESU (Cinétique de Réaction en Ecoulement Supersonique Uniforme) apparatus has been used to measure rate coefficients for the reactions of C (3P) with O2 and NO at temperatures from 295 K down to 15 K. C (3P) atoms were, for the first time in a kinetic study, monitored directly by vacuum ultraviolet laser-induced fluorescence. The rate coefficients for both reactions increase as the temperature is lowered, matching the expressions k(C+O2)=(4.9±0.8)×10−11 (T/298 K)−(0.32±0.08) cm3 molecule−1 s−1 and k(C+NO)=(1.5±0.4)×10−10 (T/298 K)−(0.16±0.14) cm3 molecule−1 s−1. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.481448
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  • 7
    Electronic Resource
    Electronic Resource
    Low temperature measurements of the rate of association to benzene dimers in helium (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 112 (2000), S. 4506-4516 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The association of benzene molecules to form dimers has been studied at temperatures between 15 and 123 K in a CRESU (Cinétique de Réactions en Ecoulement Supersonique Uniforme) apparatus with helium as the buffer gas. Second-order rate coefficients (k2) for the formation of dimers have been determined for temperatures between 15 and 88 K. The effective third-order rate coefficients (no study of fall off behavior has been undertaken) obtained by dividing the values of k2 by [He] show a strong negative temperature dependence. Further evidence for the formation of dimers at critical concentrations of benzene has been obtained from a study of the CH+C6H6 reaction and from LIF spectra. Modelling calculations indicate that any systematic errors in the results arising from the formation of higher oligomers are small. Based on a model in which it is assumed that the benzene molecules in the dimer are free to rotate, third-order rate coefficients have been calculated for dimerization and are in good agreement with the experimental values for T≥30 K, where effects of falloff should not be too great.© 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.481080
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  • 8
    Electronic Resource
    Electronic Resource
    Rate coefficients for the reactions of Si(3PJ) with C2H2 and C2H4: Experimental results down to 15 K (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 115 (2001), S. 6495-6503 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Rate coefficients for the reaction of ground-state silicon atoms Si(3PJ) with acetylene and ethylene have been measured at temperatures down to 15 K. The experiments have been performed in a continuous flow CRESU (Cinétique de Réaction en Ecoulement Supersonique Uniforme) apparatus using pulsed laser photolysis of Si(CH3)4 to generate Si(3PJ) atoms and laser-induced fluorescence to observe the kinetic decay of the atoms and hence determine the rate coefficients. Both reactions are found to be fast, and the reaction rates show a very mild dependence on temperature. The rate coefficients match the expressions k(Si+C2H2)=(2.6±0.6)10−10(T/300)−(0.71±0.24) exp(−(29±10)/T) cm3 molecule−1 s−1 and k(Si+C2H4)=(3.7±0.3)10−10(T/300)−(0.34±0.10) exp(−(16±4)/T) cm3 molecule−1 s−1 in the temperature range 15–300 K. The nature of the products and the similarities of the carbon and silicon chemistry are discussed. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1396855
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  • 9
    Electronic Resource
    Electronic Resource
    Collision induced fragmentation of small ionic sodium clusters. II. Three-body fragmentation (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 113 (2000), S. 1061-1066 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Multiple fragmentation of small Nan+ clusters (n=3–5) induced by collision with He atoms is investigated in the 200 eV collision energy range. The Nan+→Nan−2++Na+Na channels are studied using a multicoincidence technique allowing for the determination of the velocity vectors of the three fragments. The relative contributions of the two basic mechanisms, namely the electronic excitation and the momentum transfer in elastic binary collisions between the He atom and a Na core are estimated. For Na4+ and Na5+ clusters the momentum transfer mechanism appears as a two-step process: The ejection of a fast Na atom in a binary Na–He collision followed by the evaporation of an additional slow Na atom. However the angular distribution of the slow Na atom is not isotropic showing that a partial memory of the initial binary collision appears in the evaporation process. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.481886
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  • 10
    Electronic Resource
    Electronic Resource
    Infrared spectra of the C2H2–HCl complexes: An experimental and ab initio study (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 113 (2000), S. 4876-4884 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: By means of a pulsed slit jet and an infrared tunable diode laser spectrometer, the vibration–rotation absorption spectra of the complexes C2H2–H35Cl and C2H2–H37Cl have been observed for the first time in the 3.6 μm region of the ν1 band correlated with the HCl stretch. All the lines of the spectrum have been assigned for J=0 to 18 and Ka=0, 1, 2, 3. To determine the band origin and the rotational and centrifugal constants, the observed line frequencies have been fitted to those determined by the Watson Hamiltonian in the A reduction. A force constant model has been used to derive the binding energy De of the complex and the intermolecular stretching harmonic frequency from the experimental spectroscopic constants. The available experimental results concerning these complexes and other isotopic forms D35Cl and D37Cl were compared with ab initio calculations performed at the coupled-cluster single double triple [CCSD(T)] level of theory. The comparison turned out to be very good for all the properties considered (geometries, frequencies, energies). © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1289250
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