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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:2017-07-27


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