Carbon chains containing group IV elements: Rotational detection of GeC4 and GeC5

McCarthy, Michael C.

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https://hdl.handle.net/2142/96826 Copy

Description

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

Issue Date

2017-06-20

Keyword(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_

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/96826

DOI

https://doi.org/10.15278/isms.2017.TC09

Copyright and License Information

Copyright 2017 Michael C. McCarthy

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