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Table 1.
Spectroscopic constants of the ground 
and 
excited states of l-Si2C2.
| A | B | C | D | E | |
|---|---|---|---|---|---|
| Origin (cm−1) | 19358.1817(5) | 19487.4445(8) | 19705.7370(18) | 19190.381(5) | 19302.54(1) |
| B″ | 0.051923(12) | 0.051923 (a) | 0.051923 (a) | 0.05357(5) | 0.0536(1) |
| B′ | 0.050175(12) | 0.0507798(22) | 0.050587(8) | 0.05193(6) | 0.0520(1) |
| λ″ | 2.527(6) | 2.5267 (a) | 2.5267 (a) | 2.50(1) | 2.17(1) |
| λ′ | 0.414(8) | 0.3312(8) | −0.1951(18) | 0.26(1) | −0.03(1) |
| γ″ (105) | −13(4) | −13 (a) | −13 (a) | – | – |
| γ′ (105) | 5(3) | −2.8(18) | 71(6) | – | – |
 (108) |
1.5(5) | 1.5 (a) | 1.5 (a) | – | – |
 (108) |
1.8(8) | 8.5(12) | 1.05(66) | – | – |
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