Mass spectra of the four deuteromethanes have been re~easu~ed uS.ing samples of improved isotopic purity. The relative abundances of fragment lOns myolvmg loss of I~ 0: D atoms from the molec ules CH3D, CH2D2, and CHD3 are not proportlOnal to the a pnon probabilities of removing H or D atoms but have been expressed in t erms of the a priori probabil ity times a weighting factor. The weighting ~a~tor for remo,:"ing one H or D ~tom from these mol ec ul es can be roughly expressed as posItIve and negahve powers of a slDgle constant 1.19 ±O.015 and the same power law holds for the relative abundances of H+ and D +. Weighting factors for removing two or more hydrogenic atoms are not consistent with this power law.
Mass spect ra of alp.ha, beta, and pa ra dellterostyrene; beta, beta dide ll terosLy rene; a nd alpha:, beta:, beta tTld e~l tero styr e n e have bee n m easured. The sp eet ra are compared wit h t he m tenslty distrib utIOn computed on t he ass umption of a random distr ibu tion of d euterium in CsH s. T his gi ves a fair approximation to t he observed spectra. The spectra o f doubly ch"r ged styren es a re computed on t he basis of obser ved half integer p eaks i n C sH s and C~H 7 D . The m et~s tl!'bl e t ransit ion p eaks of t he d e uterostYl enes have bcen rec?rdcd. It l~ s uggest ed t ha~ IOm ze<;i styr en e molecules may form an octatetra ene ring which dlssocJa tes wI t h a random dlstnbut lOn of d eutcrJum atoms b ut t he obser ved spectra are not completely rand om and t her e may be ot her m odes of fragmen tation.
Mass spectra of seven of the nine possible deuteroethanes have been m easured. When the patterns are computed on a scale to make t he sums of ions equal, it is found t hat the abundances of molecul e ions differ nearly t wofold in the different molecules and there are large differences. in the patterns of t,he two C~H4 D2 mole~ules. The peaks i~l the C1 range are compared wIth the patterns predIcted for Simple breaklllg of the C-C bond and dissociat ion of the methyl radicals. The "weighting factors" for removing H and D HD an d 2D etc., from C2HD5 are computed and also the weighting factors for H + and 'D+ f~r all th~ deuteroethanes are given.
Monoisotopic mass spectra are given for the compounds: tetrameth yllead, t rim ethylethyllead, dimethyldiethyllead, methyltriethyllead, tetraethyllead, tetrapropylJ ead, trimethyl-n-butyllead, trimethyl-sec-butyllead, trimethyl-tert-butyllead, and tetra-isobutyllead. R elations between relative probabilities of ion formation and molecular structure are observed for several ion configurations and are discussed briefly.
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