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 Title: PROBING THE STRUCTURES OF NEUTRAL B11 AND B12 USING HIGH-RESOLUTION PHOTOELECTRON IMAGING OF B11− AND B12− Author(s): Cheung, Ling Fung Contributor(s): Wang, Lai-Sheng; Czekner, Joseph Subject(s): Mini-symposium: Multiple Potential Energy Surfaces Abstract: We report high-resolution photoelectron imaging of B$_{11}$$^- and B_{12}$$^-$ at 354.7 and 532.0 nm, respectively, resolving several low-frequency vibrational modes for neutral B$_{11}$ and B$_{12}$. The vibrational information is highly valuable to verify the structures of the neutral clusters. Several isomers are considered, and vibrational frequencies are calculated for B$_{11}$ and B$_{12}$ using density functional theory. Comparisons between the experimental and calculated vibrational frequencies prove that the B$_{11}$ neutral and anion both possess a perfectly planar C$_{2v}$ structure. The B$_{12}$$^-$ anion is quasi-planar with C$_s$ symmetry, while the experiment confirms that neutral B$_{12}$ possesses C$_{3v}$ symmetry. The high-resolution photoelectron spectra also allow the electron affinities of B$_{11}$ and B$_{12}$ to be measured more accurately as 3.401 and 2.221 eV, respectively. It is shown that high-resolution photoelectron imaging can be an effective method to determine structures of small neutral boron clusters, complementary to infrared spectroscopy. Issue Date: 6/20/2017 Publisher: International Symposium on Molecular Spectroscopy Citation Info: APS Genre: CONFERENCE PAPER/PRESENTATION Type: Text Language: English URI: http://hdl.handle.net/2142/97142 DOI: 10.15278/isms.2017.TB06 Date Available in IDEALS: 2017-07-272018-01-29
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