Knowledge Bank

Thanks to multiplex arid throughput advantages, the technique of high resolution Fourier spectroscopy is particularly useful in the study of certain non-observed (or not easily observed) excited states through their emission infra-red spectra. This is for instance the case for the $w3\Delta u$ state of the $P2$ and $N2$ molecules. It has been possible to localize and rotationally analyze the unknown (or badly known) states coming from the configuration KKLL $(\sigma g\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}s)2(\sigma u\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}s)2(\Pi u3p)3(\sigma g3p)2(\Pi g3p)$, through the $b3\Pi g-w\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}\Delta u$ emission spectrum. This system is observed in the 2500-4500 $cm-1$ region for the $N2$ molecule (WU-BENESH system) and the related rotational analysis is now in progress. The same system is observed in the $4000-5700cm-1$ range for the $P2$ molecule and the rotational analysis leads to the corresponding parameters for the$w3\Delta u$ state. Molecular parameters of the $w3\Delta u$ (v = 0) state of $P2$ (in $cm-1$) and equilibrium constants [FIGURE] The quoted uncertainty is equal to two standard deviations. a) $P=P\Delta +P\Delta JX$ b) $\nu \Delta =0$ C) Estimated valves from the subband P heads.