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The less volatile components of the[diethyl aluminum(III)chloride?water(20: 1)]system were deduced from mass spectrometry. Ions which bear two aluminum atoms were classified to one of the proposed skeletal structures on the basis of several established facts: (1)aluminum atoms hardly change their valence during fragmentations, (2)the stability of bridge bondings increases in the order ethyl

An attempt to approximate the peak height determined by magnetic scanning from the intensity of ions detected on a photographic plate through the use of a mass spectrograph of the Mattauch-Herzog type has been empirically studied. The approximation has been performed by the use of calibration plots of logarithm of exposures against the reciprocal of the transmittance determined by a photodensitometer and by the use of a mass correcting factor . Thevalidity of the procedures was examined for the spectrum of choresterol which was measured according to a routine manner, giving an acceptable compromise between the two intensities.

The procedure by which the peaks arising from the background can be checked and subtracted has been reported. The mass spectra of the background and sample were detected in separate runs of the plate under controlled conditions, and were stored in separate dimensions in a computer. The checks and subtractions were carried out on the basis of difference in exact masses and of the ratio of intensities. A similar procedure was also be applied to the checks and subtractions of the reactants(sample background)in a reaction mixture to afford only a spectrum of the species produced by the reaction. The subtractions of the background and sample background were examined for a mixture of benzophenone(I), 2, 4-dinitrophenylhydrazine(II)and2, 4-dinitrophenylhydrazone of I being taken I and II as sample backgrounds. The utility and limitation of the procedure have been described and discussed.