Shape resonances are prominent features observed in both electron transmission spectroscopy (ETS) and inner shell electron energy loss spectroscopy (ISEELS) or xhyphen;ray absorption spectroscopy (XAS). For the inner shell excitation process the resonant state is stabilized by the positive core created. In comparing analogous features in ET and ISEEL spectra, a measure of this stabilization is given by the sum of the attachment energy from ETS and term value from ISEELS. Employing ETS and ISEELS data from the literature as well as new spectra, it is shown that within an homologous series (such as halobenzenes, vinyl halides, or methyl halides) this stabilization is nearly constant with a value in the 6 to 8 eV range. Furthermore, the intensities of shape resonances in ETS are shown to be related to intensities in ISEELS.
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