# THE ROTATIONAL SPECTRA OF THE $HCCCNH^{+}$, $NCCNH^{+}$, AND $CH_{3}CNH^{+}$ IONS

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 dc.creator Gottlieb, C. A. en_US dc.creator Apponi, A. J. en_US dc.creator McCarthy, M. C. en_US dc.creator Thaddeus, P. en_US dc.creator Linnartz, H. en_US dc.date.accessioned 2006-06-15T19:58:18Z dc.date.available 2006-06-15T19:58:18Z dc.date.issued 2000 en_US dc.identifier 2000-RC-08 en_US dc.identifier.uri http://hdl.handle.net/1811/19742 dc.description Author Institution: Harvard-Smithsonian Center for Astrophysics; Division of Engineering and Applied Sciences, Harvard University; Institute for Physical Chemistry, University of Basel en_US dc.description.abstract The rotational spectra of the $HCCCNH^{+}, NCCNH^{+}$ and $CH_{3}CNH^{+}$ ions have been observed for the first time in a supersonic molecular beam by Fourier transform microwave (FTM) spectroscopy. Precise values of the rotational and centrifugal distortion constants were determined for all three ions, and quadrupole hyperfine structure was observed in $HCCCNH^{+}$ and $NCCNH^{+}$. It was found that eQq for the inner nitrogen atom in $HCCCNH^{+}$ and $NCCNH^{+}$ is an order of magnitude smaller than that of the terminal nitrogen atom in most polyatomic molecules of this size. The narrow-line FTM spectra reveal that the ions move with essentially the same velocity as the neutral buffer gas in the supersonic beam; there is no evidence for excess broadening of the rotational lines of the ions with respect to those of the neutrals. The abundances of the ions here are sufficiently high to be detectable by present laser techniques. en_US dc.format.extent 111074 bytes dc.format.mimetype image/jpeg dc.language.iso English en_US dc.publisher Ohio State University en_US dc.title THE ROTATIONAL SPECTRA OF THE $HCCCNH^{+}$, $NCCNH^{+}$, AND $CH_{3}CNH^{+}$ IONS en_US dc.type article en_US