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CAVITY RINGDOWN SPECTROSCOPY OF $HC_{7}H$ AND $HC_{9}H$

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/19356

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Title: CAVITY RINGDOWN SPECTROSCOPY OF $HC_{7}H$ AND $HC_{9}H$
Creators: Ball, C. D.; McCarthy, M. C.; Thaddeus, P.
Issue Date: 1999
Abstract: Vibronic bands of the $^{3}\Sigma_{-} \leftarrow X^{3}\Sigma_{g}^{-}$ transitions of linear $HC_{7}H$ and $HC_{9}H$ have been detected in the gas phase using cavity ringdown spectroscopy in the wavelength range 500-600 nm. The $0^{0}_{0}$ bands of both molecules, as well as an additional vibronic band of $HC_{9}H$, were measured. Both molecules were produced in a DC discharge through a dilute mixture of diacetylene in Ar in the throat of a supersonic nozzle. The identifications were confirmed by detecting the singly and doubly deuterated species of both molecules, and by comparison with previous matrix $data^{a}$. Neither molecule could be detected by laser-induced fluorescence. Each band exhibits expected P- and R-branches, and the band origins have been measured to $0.1 cm^{-1}$ or better. For $HC_{9}H$, the wavelength of the $0^{0}_{0}$ band agrees to within one part in $10^{4}$ with that of the weak diffuse interstellar band at 581.86 nm. Astronomical verification of this assignment could be achieved by detecting the expected P- and R-branches in the DIB, or by detecting the somewhat weaker $v_{3}$ band at 521.91 nm.
URI: http://hdl.handle.net/1811/19356
Other Identifiers: 1999-RF-08
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