Dilithium

Source: Wikipedia, the free encyclopedia.
This article is about the real substance. For other uses, see Dilithium (disambiguation).
Dilithium
Wireframe model of dilithium
Spacefill model of dilithium
Names
IUPAC name
Dilithium(Li—Li)[citation needed]
Identifiers
3D model (
JSmol
)
ChemSpider
  • InChI=1S/2Li checkY
    Key: SMBQBQBNOXIFSF-UHFFFAOYSA-N checkY
  • [Li][Li]
Properties
Li2
Molar mass 13.88 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Dilithium, Li2, is a strongly

diatomic molecule comprising two lithium atoms covalently bonded together. Li2 is known 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.[1] The electron configuration of Li2 may be written as σ2.

It has been observed that 1% (by mass) of lithium in the vapor phase is in the form of dilithium.[citation needed][clarification needed]

Being the lightest stable neutral homonuclear diatomic molecule after H2, and the helium dimer, 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,[2] a-state,[3] A-state,[4] c-state,[5] B-state,[6] 2d-state,[7] l-state,[7] E-state,[8] and the F-state[9] . The most reliable of these potential energy curves are of the Morse/Long-range variety (see entries in the table below).[2][3][6][4][5]

Li2 potentials are often used to extract atomic properties. For example, the C3 value for atomic lithium extracted from the A-state potential of Li2 by Le Roy et al. in [2] is more precise than any previously measured atomic oscillator strength.[10] This lithium oscillator strength is related to the radiative lifetime of atomic lithium and is used as a benchmark for atomic clocks and measurements of fundamental constants.

Electronic state
 Spectroscopic symbol Term symbol Bond length (pm) Dissociation energy (cm−1) Bound vibrational levels References
1 (Ground) X 11Σg+ 267
 .298 74(19)[2] 8 516
 .780 0(23)[2] 39[2] [2]
2 a 13Σu+ 417
 .000 6(32)[3] 333
 .779 5(62)[3] 11[3] [3]
3 b 13Πu [7]
4 A 11Σg+ 310
 .792 88(36)[2] 9 353
 .179 5 (28)[2] 118[2] [2]
5 c 13Σg+ 306
 .543 6(16)[3] 7 093
 .492 6(86)[3] 104[3]
6 B 11Πu 293
 .617 142(310)[6] 2 984
 .444[6] 118[6]
7 E 3(?)1Σg+ [8]

See also

References

  1. ISBN 0-19-855694-2
  2. ^
    PMID 19947682
    .
  3. ^
    S2CID 119266866
    .
  4. ^ a b W. Gunton, M. Semczuk, N. S. Dattani, K. W. Madison, High resolution photoassociation spectroscopy of the 6Li2 A-state, https://arxiv.org/abs/1309.5870
  5. ^
    S2CID 119263860
    .
  6. ^
    doi:10.1063/1.1607313
    .
  7. ^
    doi:10.1016/j.jms.2007.09.008
    .
  8. ^
    doi:10.1063/1.1374927
    .
  9. doi:10.1063/1.1311297
    .
  10. S2CID 122544942. Archived from the original
    (PDF) on 2020-06-25.

Further reading
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