THE ULTRA VIOLET SPECTUM OF THE NCN RADICAL

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 Title: THE ULTRA VIOLET SPECTUM OF THE NCN RADICAL Creators: Beaton, S. A.; Brown, J. M.; Ito, Y. Issue Date: 1996 Abstract: The (0,0) band of the $\tilde{A}^{3}\Pi_{u}-\tilde{X}^{3}\Sigma^{+}_{g}$ transition of NCN, observed previously by Herzberg and Travis $^{a}$, has been reinvestigated by means of laser-induced fluorescence at 329 nm. A frequency doubled dye laser was used to record the spectrum of NCN downstream of a microwave discharge through $N_{2}$ and $CF_{4}$ in $He^{b}$. From the rotational analysis, improved values for the molecular constants of NCN in both states were obtained, including A-type doubling parameters for the $3\Pi$ upper state.The main molecular constants obtained were $$\tilde{X}^{3}\Sigma^{+}_{g}:\qquad B^{\prime\prime}_{000}=0.3972458(95) \mbox{ cm }^{-1}\qquad X^{n}=0.79402(50)\mbox{ cm}^{-1}$$ $$\tilde{A}^{3}\Pi_{u}^{+}:\qquad B^{\prime}_{000}=0.3966487(95)\mbox{cm}^{-1}\qquad A^{\prime}=37.4493(38)\mbox{cm}^{-1}$$ $$T^{\prime}_{000}=30388.8110(51)\mbox{cm}^{-1}$$ THE $B$ values (and hence bond lengths) are very similar in the two states and therefore the spectrum is dominated by $\Delta_{t}=0$ transitions. The (010)-(010) band occurs in a similar wavelength region, the excited state of this transition exhibiting the Renner-Teller effect. Analyses of both the $^{3}\Delta_{g}-3^\Pi_{u}$ and the $^{3}\Sigma_{g}-^{3}\Pi_{u}$ components of this hot band will be presented. URI: http://hdl.handle.net/1811/13662 Other Identifiers: 1996-TF-03