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The primary interactions of high energy photons and electrons with matter in the gas phase were studied. The experimental studies included measurements of the mass/charge spectra produced both by x-ray ionization and by high energy electron ionization, as well as secondary electron energy measurements for both x-ray and electron ionization. The molecules studied were the following: propane, ethanol, ethylamine, silane, hydrogen sulfide, hydrogen chloride, argon, methane, ammonia, water, neon, ethyl silane, ethanethiol, ethyl chloride, methyl chloride, methyl bromide, ethyl bromide, hydrogen bromide, krypton, methyl iodide, ethyl iodide, carbon tetrachloride, xenon, mercury, dimethylamine, 1, 3-butadiene, n-butane, 2butyne, oxygen and nitrogen. The data obtained in these investigations are the first comprehensive measurements of inner shell ionization by x-rays in which the resulting mass/charge spectra were measured in a mass spectrometer. The theoretical interpretation and a semiempirical correlation of the experimental data are discussed. (Author)