Abstract
The high-resolution photoelectron spectra of $\mathrm{C}{\mathrm{o}}^{\ensuremath{-}}$ were obtained via the slow-electron velocity-map imaging method. The electron affinity of cobalt element was determined to be $5341.45(37)\phantom{\rule{0.16em}{0ex}}\mathrm{c}{\mathrm{m}}^{\ensuremath{-}1}$ or 662.256(46) meV. The fine structure of $\mathrm{C}{\mathrm{o}}^{\ensuremath{-}}$ was well resolved. The fine-structure intervals $\mathrm{C}{\mathrm{o}}^{\ensuremath{-}}(^{3}F_{4})\ensuremath{-}\mathrm{C}{\mathrm{o}}^{\ensuremath{-}}(^{3}F_{3})$ and $\mathrm{C}{\mathrm{o}}^{\ensuremath{-}}(^{3}F_{4})\ensuremath{-}\mathrm{C}{\mathrm{o}}^{\ensuremath{-}}(^{3}F_{2})$ were found to be $920.9(6)\phantom{\rule{0.16em}{0ex}}\mathrm{c}{\mathrm{m}}^{\ensuremath{-}1}$ and $1550.3(9)\phantom{\rule{0.16em}{0ex}}\mathrm{c}{\mathrm{m}}^{\ensuremath{-}1}$, respectively. The accuracy was improved by a factor of more than ten with respect to the previous laser photodetachment threshold measurement.
Published Version
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