A. Klinkmüller coauthored research on electron affinity.[ref]
Isotope shift in the electron affinity of chlorine by U. Berzinsh and others. publication title and author list
For chlorine, a published photodetachment threshold is , approximately per chemical atom. Here is the Planck constant, the speed of light, and the inverse-length unit expresses an energy through a spectroscopic wavenumber. The parentheses give the reported uncertainty in the last digits, not a range of possible sign conventions.
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