Abstract
Electron-transmission spectroscopy is used to observe structure in the electron-scattering cross section associated with the formation of temporary negative ions and channel-opening effects. A strong ``family'' resemblance is apparent among the resonances of the alkali metals. From published calculations and angular scattering studies, the lower-lying features are known with some confidence. Based on these, plausible assignments for some of the higher-lying resonances are put forth. We propose that the absence of resonances near the Cs 5 $^{2}$D and possibly the Na 4 $^{2}$P and 5 $^{2}$P thresholds is associated with the negative polarizabilities of these excited states.
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