Photoelectron (PE) spectra of ClH−2 and ClD−2 were measured at 299 nm (4.154 eV). Photodetachment of these anions accesses the prereactive van der Waals well on the ground stateCl+H2potential energy surface, as well as the low-lying spin–orbit excited states resulting from the interaction of Cl and Cl* with H2. The PE spectra are dominated by two relatively narrow peaks corresponding to transitions to the neutral Cl⋅H2 and Cl*⋅H2 complexes. The energetics and widths of these features are interpreted in terms of the properties of the anion and neutral potential energy surfaces.
Ferguson, Michael J. and Meloni, Giovanni and Gomez, Harry and Neumark, Daniel M. Photoelectron spectroscopy of ClH2 - and ClD2 -: A probe of the Cl+H2 van der Waals well and spin-orbit excited states. Journal of Chemical Physics, 117, 8181-8184 (2002)