The dissociation rates and energetics of the loss of halogen atoms from energy-selected halotoluene ions were investigated by photoelectron photoion coincidence (PEPICO) and collisional activation (CA) mass spectrometric experiments. Dissociation onsets, determined from the dissociation rates measured as a function of the internal energy of the parent ion, revealed the formation of three [C7H,]+ isomers, which were identified, on the basis of the CA data, as the tolyl, benzyl and tropylium ions. All of the ions investigated produced a mixture of isomeric ions. Only iodotoluene ions produced any tolyl product ions by a direct bond cleavage. The bromo-and chlorotoluene ions produced mixtures of benzyl and tropyl ions. The observed two-component decay rates of the iodotoluene ions revealed the participation of a lower energy [C,H,Il+' isomer in the dissociation process. The identity of this isomer is not known but it probably does not have the cycloheptatriene ion structure because considerable kinetic energy was released in this dissociation.
A capillary electrophoresis model was modified to include the effect of laminar flow. Experimental results using inorganic ions with a wide range of mobilities were compared to model predictions. The effect of laminar flow rate on analysis time, peak widths, peak asymmetry, and electrophoretic resolution is discussed. The laminar flow rate in the electrophoresis capillary was controlled by regulating the sheath flow rate in a concentric nebulizer interface. Laminar flow in the direction of the detector allows the analysis of positive, neutral, and negative species, all in one electrophoretic run, in less than 2 min.
and no energy gap should be present. Experimentally, no energy gap is found. The £00 band of the emission spectrum is at about 13 850 cm'1 11;the absorption spectrum has its initial intensity at about 14 000 cm '1.4•5•19 It has been shown that the energy gap and the vibronic spacing in the electronic spectra of the [PtCl4]2' ion are explained by an excited-state distortion in a non-totally symmetric mode. The 315-cm'1 MIME frequency results from the distortion in the 329-cm'1 A|g mode and the 304-cm™1 Blg mode. The low intensity
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