Two-photon photodetachment spectroscopy of cold C6− probing three excited 2Π g states

We report on an experimental investigation of the photoabsorption of cold (∼30 K) C6- anions in the range 420-650 nm by laser two-photon photodetachment on a stored beam of anions in a merged beams interaction setup. The recorded photoabsorption spectrum shows evidence for photoabsorption through the lowest 2Πg states (labeled C, D, and E) with new assignments of the term values of T0.C = 1.9363 eV, T0.D = 2.2992 eV, and T0.E = 2.7029 eV. The detailed structures of the photoabsorption spectrum s