Probing the structures of neutral B11 and B12 using high-resolution photoelectron imaging of B11− and B12−
Cheung, Ling Fung
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https://hdl.handle.net/2142/97142
Description
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
Issue Date
2017-06-20
Keyword(s)
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.
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