Measuring electron affinities with the photodetachment microscope . " Phys.
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Photodetachment microscopy made it possible to image the spatial distribution of the ejected electron.
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The microscope developed in 1996 was the first to image photodetachment rings of a negative Bromine ( Br-) ion.
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He then went on to study alkali halides in the gas phase, first at the University of Michigan and then at Yale, using shock waves to produce sufficient dissociation of the molecules to ions to make it feasible to observe the photodetachment spectra of the halide ions, thus determining the electron affinities of the halogen atoms to four or five significant figures.
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