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 Title: CARBON CHAINS CONTAINING GROUP IV ELEMENTS: ROTATIONAL DETECTION OF GeC4 AND GeC5 Author(s): McCarthy, Michael C Contributor(s): Thorwirth, Sven; Martin-Drumel, Marie-Aline Subject(s): Structure determination Abstract: Following the recent discovery of T-shaped GeC$_2$ by chirped-pulse FT microwave spectroscopy, evidence has been found for two longer carbon chains, GeC$_4$ and GeC$_5$, guided by high-level quantum chemical calculations of their molecular structure. Like their isovalent Si-bearing counterparts, those with an even number of carbon atoms are predicted to possess $^1Sigma$ ground states, while odd-numbered carbon chains have low-lying $^3Sigma$ linear isomers; all are predicted to be highly polar. With the exception of $^{73}$Ge, rotational lines of the other four Ge isotopic species have been observed between 6 and 18,GHz. From these measurements, the Ge-C bond length has been determined to high precision, and can be compared to that found in other Ge species, such as GeC [1] and GeC$_3$Ge [2] studied previously at rotational resolution. Somewhat surprisingly, the spectrum of GeC$_5$ very closely resembles that of $^1Sigma$ molecule, presumably owing to the very large spin-orbit constant of atomic Ge, which is manifest as an equally large spin-spin constant in the chain. A comparison between the production of SiC$_n$ and GeC$_n$ chains by laser ablation, including the absence of those with $n=3$, will be given. _x000d_ _x000d_ hfilleject_x000d_ _x000d_ [1] C. R. Brazier and J. I. Ruiz, {it J. Mol. Spectrosc.}, {bf 270}, 26-32 (2011)._x000d_ _x000d_ [2] S. Thorwirth {it et al.}, {it J. Phys. Chem. A}, {bf 120}, 254-259 (2016)._x000d_ _x000d_ _x000d_ _x000d_ _x000d_ Issue Date: 6/20/2017 Publisher: International Symposium on Molecular Spectroscopy Citation Info: APS Genre: CONFERENCE PAPER/PRESENTATION Type: Text Language: English URI: http://hdl.handle.net/2142/96826 DOI: 10.15278/isms.2017.TC09 Date Available in IDEALS: 2017-07-272018-01-29
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