A new mass spectrometric technique is described by which information can be obtained on the specific progenitor or progenitors of a mass peak. The method comprises modulating the neutral beam at an appropriate frequency and observing the ion signal with a phase-sensitive detector. Measurement of signal intensity at different phase angles with respect to a point of origin provides a curve from which can be extracted information on the relative contribution of different species in the neutral beam to the ion signal. A theoretical analysis of the method is described, and theoretically calculated intensity vs phase angle curves are presented for some systems of interest. Curves for AlF are compared with experimental data and very good agreement demonstrated. Preliminary data on the pressure ratios of monomer, dimer, and trimer in LiF vapor are discussed.
The infrared absorption spectra of two solutions of tetra-n-butylammonium perchlorate in ethylene chloride, 0.77 and 1.23 v.f., respectively, have been determined at ∼25°C. By comparison of these spectra with the spectrum of pure ethylene chloride it is shown that the mole ratio of the gauche to the trans form of ethylene chloride in each of these salt solutions (1.69 and 1.92, respectively) is significantly greater than it is in pure ethylene chloride (1.3).
The degree of dissociation of the salt in each of the two solutions is estimated from the measured values of their equivalent conductance-viscosity products. On this basis it is shown that in each of the solutions an appreciable fraction of ethylene chloride exists near enough to an ion to be appreciably influenced by its electric field.
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