The mobilities of NO+(CH3CN)n cluster ions (n=0–3) drifting in helium and in helium–acetonitrile mixtures

de Gouw, Joost A.; Ding, Li Ning; Krishnamurthy, M.; Lee, Hack Sung; Anthony, Eric B.; Bierbaum, Veronica M.; Leone, Stephen R.
December 1996
Journal of Chemical Physics;12/15/1996, Vol. 105 Issue 23, p10398
Academic Journal
The mobilities of NO+(CH3CN)n cluster ions (n=0–3) drifting in helium and in mixtures of helium and acetonitrile (CH3CN) are measured in a flow-drift tube. The mobilities in helium decrease with cluster size [the mobility at zero field, K(0)0, is 22.4±0.5 cm2 V-1 s-1 for NO+, 12.3±0.3 cm2 V-1 s-1 for NO+(CH3CN), 8.2±0.2 cm2 V-1 s-1 for NO+(CH3CN)2 and 7.5±0.5 cm2 V-1 s-1 for NO+(CH3CN)3] and depend only weakly on the characteristic parameter E/N (electric field strength divided by the number density of the buffer gas). The size dependence is explained in terms of the geometric cross sections of the different cluster ions. The rate constants for the various cluster formation and dissociation reactions have also been determined in order to rule out the possibility that reactions occurring in the drift region influence the measurements in the mixtures. Since high pressures of acetonitrile are required to form NO+(CH3CN)2 and NO+(CH3CN)3, the mobilities of these ions are found to be dependent on the acetonitrile concentration, as a result of anomalously small mobilities of these ions in acetonitrile [K(0)0=0.041±0.004 cm2 V-1 s-1 for NO+(CH3CN)2 and 0.044±0.004 cm2 V-1 s-1 for NO+(CH3CN)3]. These values are at least an order of magnitude smaller than any previously reported ion mobility, which can be partly explained by the large ion-permanent dipole interaction between the cluster ions and acetonitrile. The remaining discrepancies may be the result of momentum transfer outside the capture cross section, dipole–dipole interactions, ligand exchange, the formation of long-lived collision complexes or the transfer of kinetic energy into internal energy of the cluster ion and the acetonitrile molecule. © 1996 American Institute of Physics.


Related Articles

  • Bond energy oscillation in the cluster ion NO+(NO)n. Hiraoka, Kenzo; Nasu, Masayuki; Oomori, Daisuke; Minamitsu, Akihito // Journal of Chemical Physics;11/22/1996, Vol. 105 Issue 20, p9068 

    The gas-phase equilibria of the clustering reaction of NO+ with NO and F- with NO were measured with a pulsed electron-beam high-pressure mass spectrometer. Van’t Hoff plots of equilibrium constants lead to the determination of the thermochemical stabilities for NO+(NO)n with...

  • Rotational and vibrational dynamics of CO[sub 2] and N[sub 2]O in helium nanodroplets. Nauta, K.; Miller, R. E. // Journal of Chemical Physics;12/8/2001, Vol. 115 Issue 22, p10254 

    Infrared spectra are reported for carbon dioxide and nitrous oxide solvated in superfluid helium droplets, corresponding to the vibrational excitation of the (02[sup 0]1)/(10[sup 0]1) Fermi diad. Although the rotational constants of these two molecules are similar in the gas phase, they are...

  • Photoelectron spectroscopy of the negative cluster ions NO-(N2O)n=1,2. Coe, J. V.; Snodgrass, J. T.; Freidhoff, C. B.; McHugh, K. M.; Bowen, K. H. // Journal of Chemical Physics;10/15/1987, Vol. 87 Issue 8, p4302 

    We have recorded the photoelectron (photodetachment) spectra of the gas-phase negative cluster ions NO-(N2 O)1 and NO-(N2 O)2 using 2.540 eV photons. Both spectra exhibit structured photoelectron spectral patterns which strongly resemble that of free NO-, but which are shifted to successively...

  • Potential energy surface and rovibrational spectrum of He–N[sub 2]O dimer. Chang, Ben T.; Akin-Ojo, Omololu; Bukowski, Robert; Szalewicz, Krzysztof // Journal of Chemical Physics;12/8/2003, Vol. 119 Issue 22, p11654 

    Symmetry-adapted perturbation theory (SAPT) calculations were performed to determine a two-dimensional potential for the interaction of the helium atom with the nitrous oxide molecule. For selected geometries, correlated supermolecular calculations were used to verify SAPT data. The ab initio...

  • Dynamics of polar solvation in acetonitrile–benzene binary mixtures: Role of dipolar and quadrupolar contributions to solvation. Luther, Bradley M.; Kimmel, Joel R.; Levinger, Nancy E. // Journal of Chemical Physics;2/22/2002, Vol. 116 Issue 8, p3370 

    While dynamics of polar solvation have been tabulated for a wide range of pure polar solvents, substantially less is known about the dynamic response of solvent mixtures. Here, results for polar solvation dynamics are presented for the nonassociating mixture of a dipolar solvent, acetonitrile,...

  • Swarm study of Kr[sup 2+] ions in helium gas at very low temperature. Tanuma, Hajime; Hidaka, Hiroshi; Kobayashi, Nobuo // AIP Conference Proceedings;2000, Vol. 500 Issue 1, p699 

    Doubly charged helium cluster ions Kr2+-Hen (n≤40) have been produced when Kr[sup 2+] ions are injected into helium gas cooled by liquid helium. Magic numbers n=12 and 32 have been observed in the size distribution of these cluster ions. These magic numbers suggest the shell structure in...

  • Transmission of cluster ions through a tandem accelerator of several stripper gases. Saitoh, Yuichi; Chiba, Atsuya; Narumi, Kazumasa // Review of Scientific Instruments;Oct2009, Vol. 80 Issue 10, p106104 

    The transmissions of carbon cluster ion beams through a tandem accelerator using several stripper gases (He, N2, CO2, and SF6) with a terminal voltage of 2.5 MV were measured as a function of the gas pressure in investigating the most suitable gas for cluster ion acceleration. This resulted in...

  • Chemical heating of the working gas in a short-duration high-enthalpy facility. Shumskii, V. V.; Yaroslavtsev, M. I. // Combustion, Explosion, & Shock Waves;Sep2007, Vol. 43 Issue 5, p518 

    Operation of a short-duration high-enthalpy facility with products of reactions of propane, hydrogen, and nitrous oxide with air and oxygen is studied. The mixtures are ignited either by an electric arc or by an igniter with a “chamber-plume” principle of operation, which involves...

  • Experimental study of diffusion instability in three-component gas mixture without density gradient. Zhavrin, Yu.; Moldabekova, M.; Poyarkov, I.; Mukamedenkyzy, V. // Technical Physics Letters;Aug2011, Vol. 37 Issue 8, p721 

    The process of binary (propane-nitrous oxide) gas mixture diffusion into carbon dioxide was experimentally studied in a two-compartment setup at various component concentrations and pressures. Regimes of mixing are determined depending on the initial concentrations of binary mixture components.


Read the Article


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

Try another library?
Sign out of this library

Other Topics