TITLE

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

AUTHOR(S)
Frost, Michael J.; Kato, Shuji; Bierbaum, Veronica M.; Leone, Stephen R.
PUB. DATE
May 1994
SOURCE
Journal of Chemical Physics;5/1/1994, Vol. 100 Issue 9, p6359
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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.
ACCESSION #
7618804

 

Related Articles

  • Intramolecular energy flow and bond dissociation in iodoacetylene and iododiacetylene. Kim, Y. H.; Ree, J.; Lee, C. S.; Shin, H. K. // Journal of Chemical Physics;9/15/1994, Vol. 101 Issue 6, p4668 

    Intermolecular and intramolecular energy flow and subsequent bond dissociation in collinear collisions I–C≡C–H+Ar and I–C≡C–C≡C–H+Ar have been studied by classical trajectory techniques over the collision energy range of 0 to 10 eV. When the...

  • Ab initio study of electronic energy transfer in the quenching of N2(A 3Σ+u) and N2(B 3Πg) by H2. Sperlein, Robert F.; Golde, Michael F. // Journal of Chemical Physics;9/1/1988, Vol. 89 Issue 5, p3113 

    The interactions of N2(A 3Σ+u) and N2(B 3Πg) with H2(X 1Σ+g) have been characterized through potential energy calculations, which were performed using a combination of MCSCF and multiple-reference SDCI methods. In C2v geometry with the N2 and H2 bond axes parallel, at the highest level...

  • Electron-impact ionization and dissociation of CD. Lecointre, J.; Cherkani-Hassani, H.; Cherkani-Hassani, S.; Belic, D. S.; Jureta, J. J.; Defrance, P. // European Physical Journal D -- Atoms, Molecules, Clusters & Opti;Nov2010, Vol. 60 Issue 2, p331 

    olute cross sections for electron-impact single ionization, dissociative excitation and dissociative ionization of the ethynyl radical ion (CD $^+)$ have been measured for electron energies ranging from the corresponding reaction thresholds to 2.5 keV. The animated crossed electron-ion beam...

  • dissociation.  // Taber's Cyclopedic Medical Dictionary (2009);2009, Issue 21, p674 

    Definitions of the term "dissociation" which refers to separation by heat of a complex compound into simpler molecules or the separation of ions when a salt is dissolved, are presented.

  • Electron impact dissociation of HgX2 (X=Cl, Br, I). Kushawaha, V.; Mahmood, M. // Journal of Applied Physics;9/15/1987, Vol. 62 Issue 6, p2173 

    Presents a study on the electron impact dissociation of HgX[sub2] molecules in the electron energy range of 1-100 eV. Experimental procedure and data analysis; Results and discussion; Conclusion.

  • Variation with temperature of the electron attachment to SO2F2. Datskos, P. G.; Christophorou, L. G. // Journal of Chemical Physics;3/1/1989, Vol. 90 Issue 5, p2626 

    The total electron attachment rate constant ka(<ε>,T) for SO2F2 has been measured, in a buffer gas of N2, as a function of the mean electron energy 〈ε〉 (0.046–0.911 eV) and temperature T (300–700 K) using an electron swarm technique. From the measured...

  • Molecule–surface dissociative scattering of n-C3F7NO from MgO(100) at hyperthermal energies: Nascent NO (X 2Π). Kolodney, E.; Baugh, D.; Powers, P. S.; Reisler, H.; Wittig, C. // Journal of Chemical Physics;4/1/1989, Vol. 90 Issue 7, p3883 

    The title reaction was examined for incident kinetic energies in the range 3–7 eV and surface temperatures in the range 500–800 K; dissociation probabilities as high as 3±1% were measured. NO state distributions were obtained near the specular angle using two-photon,...

  • Isotopic branching ratio for the reaction A+HD→AD(H)+H(D). Tsukiyama, K.; Katz, B.; Bersohn, R. // Journal of Chemical Physics;9/15/1985, Vol. 83 Issue 6, p2889 

    Several reactions of the form A+HD→AD(H)+H(D) have been studied by a two laser experiment. One laser dissociates a molecule to form a reactive atom A and the second laser monitors the hydrogen atom products by laser induced fluorescence. When A is F(2P), O(1D), and S(1D), the H/D ratios...

  • A comparative study of the ground state internuclear potentials of alkali hydrides and estimation of dissociation energies with the use of the RPC (reduced potential curve) method. Jencˇ, F.; Brandt, B. A. // Journal of Chemical Physics;12/1/1985, Vol. 83 Issue 11, p5486 

    The RKR potential curves for the ground states of alkali hydrides, calculated in recent years by several authors on the basis of new measurements employing modern techniques, have been analyzed with the use of the RPC method. The ground state reduced potential curves of the alkali hydrides are...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics