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Updated: Jun 18, 2026

Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps
Published on: August 17, 2017
On the elusive twelfth vibrational state of beryllium dimer
Konrad Patkowski1, Vladimír Spirko, Krzysztof Szalewicz
1Department of Physics and Astronomy, University of Delaware, Newark, DE 19716, USA. patkowsk@udel.edu
Abstract:
The beryllium dimer has puzzled chemists for roughly 80 years on account of its unexpectedly strong bonding interaction between two nominally closed-shell atoms. Recent spectroscopic measurements characterized the molecule's ground electronic state with sufficient resolution to distinguish 11 vibrational levels; the possibility that a twelfth level lay just below the dissociation threshold remained unresolved. Here we present a potential function, based on ab initio calculations at the full configuration interaction level, that definitively supports the presence of this twelfth vibrational state. "Morphed" versions of this potential, fitted to experimental data, closely reproduce the observed spectra to within 0.1 cm(-1), bolstering the strength of the assignment.
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