A very short uranium–uranium bond: The predicted metastable U22+
Author(s) -
Laura Gagliardi,
Pekka Pyykkö,
Björn O. Roos
Publication year - 2005
Publication title -
physical chemistry chemical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.053
H-Index - 239
eISSN - 1463-9084
pISSN - 1463-9076
DOI - 10.1039/b505593h
Subject(s) - metastability , uranium , atomic physics , bond length , wave function , coulomb barrier , physics , chemistry , coulomb , relativistic quantum chemistry , nuclear physics , quantum mechanics , molecule , electron
Quantum chemical calculations, based on multiconfigurational wave functions and including relativistic effects, show that the U(2)2+ system has a large number of low-lying electronic states with S of 0 to 2 and Lambda ranging from zero to ten. These states share a very small bond length of about 2.30 A, compared to 2.43 A in neutral U2. The Coulomb explosion to 2 U+ lowers the energy by only 1.6 eV and is separated by a broad barrier.
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