Lesson plan
dilithium
Dilithium, Li 2 , is a strongly nucleophilic, diatomic molecule comprising two lithium atoms covalently bonded together. Li 2 has been observed in the gas phase. It has a bond order of 1, an internuclear separation of 267.3 pm and a bond energy of 102 kJ/mol or 1.06 eV in each bond. The electron configuration of Li 2 may be written as σ 2 . Being the third-lightest stable neutral homonuclear diatomic molecule (after dihydrogen and dihelium), dilithium is an extremely important model system for studying fundamentals of physics, chemistry, and electronic structure theory. It is the most thoroughly characterized compound in terms of the accuracy and completeness of the empirical potential energy curves of its electronic states. Analytic empirical potential energy curves have been constructed for the X-state, a-state, A-state, c-state, B-state, 2d-state, l-state, E-state, and the F-state. The most reliable of these potential energy curves are of the Morse/Long-range variety (see entries in the table below). Li 2 potentials are often used to extract atomic properties. For example, the C 3 value for atomic lithium extracted from the A-state potential of Li 2 by Le Roy et al. is more precise than any previously measured atomic oscillator strength.…
Article summary
Dilithium, Li 2 , is a strongly nucleophilic, diatomic molecule comprising two lithium atoms covalently bonded together. Li 2 has been observed in the gas phase. It has a bond order of 1, an internuclear separation of 267.3 pm and a bond energy of 102 kJ/mol or 1.06 eV in each bond. The electron configuration of Li 2 may be written as σ 2 . Being the third-lightest stable neutral homonuclear diatomic molecule (after dihydrogen and dihelium), dilithium is an extremely important model system for studying fundamentals of physics, chemistry, and electronic structure theory. It is the most thoroughly characterized compound in terms of the accuracy and completeness of the empirical potential energy curves of its electronic states. Analytic empirical potential energy curves have been constructed for the X-state, a-state, A-state, c-state, B-state, 2d-state, l-state, E-state, and the F-state. The most reliable of these potential energy curves are of the Morse/Long-range variety (see entries in the table below). Li 2 potentials are often used to extract atomic properties. For example, the C 3 value for atomic lithium extracted from the A-state potential of Li 2 by Le Roy et al. is more precise than any previously measured atomic oscillator strength.…
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Discussion questions
- Summarise the article in your own words. Which single claim would you verify first, and why?
- Which claim in this article is most likely to be revised as the sources update? How would you check its current status?
- If two sources disagreed about one of these facts, what would you need in order to trust one over the other?
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