High-resolution anion photoelectron spectroscopy of cryogenically cooled 4-atom silicon carbides

Mark C. Babin, Martin DeWitt, Marissa L. Weichman, & Daniel M. Neumark
High-resolution anion photoelectron spectra of cryogenically cooled Si3C−, Si2C2−, and SiC3− obtained using slow photoelectron velocity-map imaging (cryo-SEVI) are presented, providing insight into the geometries, energetics, and vibronic structure of the anionic and the neutral clusters. These spectra yield accurate vibrational frequencies for the neutral clusters. They also yield refined adiabatic detachment energies (ADEs) for the ground states of Si3C− and Si2C2− of 1.5374(6) eV and 1.9019(4) eV, respectively, while the ADE of a low-lying...
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