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Abstract:
The structures of neutral boron clusters, B11, B16, and B17, have been investigated using vibrational
spectroscopy and ab initio calculations. Infrared absorption spectra in the wavelength range
of 650 to 1550 cm-1 are obtained for the three neutral boron clusters from the enhancement
of their near-threshold ionization efficiency at a fixed UV wavelength of 157 nm (7.87 eV) after
resonant absorption of the tunable infrared photons. All three clusters, B11, B16, and B17, are
found to possess planar or quasi-planar structures, similar to their corresponding anionic counterparts
(Bn
⁻), whose global minima were found previously to be planar, using photoelectron spectroscopy
and theoretical calculations. Only minor structural changes are observed between the neutral
and the anionic species for these three boron clusters
