MICROWAVE SPECTRA OF THE METHYLCYANOPOLYYNES $CH_{3}(C\equiv C)_{n}CN, n=2,3,4,5$

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The ground state rotational spectra of four methylcyanopolyynes, $CH_{3}(C\equiv C)_{2}CN, CH_{3}(C\equiv C)_{3} CN, CH_{3}(C \equiv C)_{4} CN$ and $CH_{3}(C\equiv C)_{2}CN$, were measured between 6 and 22 GHz by Fourier transform microwave spectroscopy. For $CH_{3}(C\equiv C)_{2}CN$, 8 transitions, each with nitrogen nuclear quadrupole hyperfine structure (hfs), were observed and a value of $eqQ = -4.25(3)$ MHz was determined for the first time. Twenty-one rotational transitions of $CH_{3}(C \equiv C)_{3}CN$, ten rotational transitions of $CH_{3}(C \equiv C)_{4}CN$, and eleven rotational transitions of $CH_{3}(C\equiv C)_{5}CN$ were detected for the first time and precise values for the rotational, leading centrifugal distortion constants of each molecule, and the nuclear quadrupole coupling constant of $CH_{3}(C\equiv C)_{3}CN$ were determined.

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Author Institution: Harvard-Smithsonian, Center for Astrophysics; Division of Engineering and Applied Sciences, Harvard University; Department of Chemistry, Wesleyan University; Harvard-Smithsonian Center for Astrophysics, Wesleyan University; Division of Engineering and Applied Sciences, Harvard University

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