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Extra resources for Advances in Gas Phase Ion Chemistry, Volume 2 (Advances in Gas Phase Ion Chemistry)

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82 83 83 ABSTRACT The use of high-pressure mass spectrometric (HPMS) and Fourier transform ion cyclotron resonance (FTICR) techniques is described for the elucidation of unimolecular dissociation of gaseous ions. (1) The kinetics of clustering of CH30- onto CH3OH in the HPMS system are used to deduce the thermal unimolecular dissociation rate constant of the proton-bound methoxide ion. In addition a second, more weakly bound electrostatic complex is implicated as an entrance channel complex on this potential energy surface.

The theoretical treatment of the ionization process has been seen as a complex problem with the involvement of three charged particles in the exit channel. 4~ Even for atomic hydrogen, the simplest ionization case, the long-range Coulomb force restricts free movement of the particles even at very large interparticle separations. 4~ Quantum methods use a partial wave approximation. The Born approximation 35 considers the incident electron as a plane wave with limited interaction with the molecule, and it has had limited s u c c e s s .

Phys. Rev. Lett. 1992, 68, 2289. ; Fink, M. Z. Phys. D 1994, 30, 177. ; B6wering, N. Z. Phys. D 1994, 30, 183. 40. ; Schlemmer, P. Z. Phys. D 1986, 1, 3. 41. ; Briggs, J. ; Klar, H. Jr. Phys. B 1989, 22, 2265. 42. ; Madison, D. ; Altick, P. L. Phys. Rev. A 1993, 48, R22. 43. McGuire, E. J. Phys. Rev. 1977,A16, 62; 1977, A16, 73; 1979,A20, 445. 44. Bartmess, J. ; Georgiadis, J. E. Vacuum 1983, 33, 149. 45. ; Daltabuit, E. Rev. Mex. Astron. Astrof 1978, 2, 325. (b) Franco, J. Rev. Mex. Fisica 1981, 27, 475.

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