EMISSION HIGH RESOLUTION FOURIER SPECTROSCOPY IN THE INFRA-RED: THE $w^{3}\Delta_{u}$ STATE OF THE $N_{2}$ AND $P_{2}$ MOLECULES

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 $w^{3}\\Delta_{u}$ state of the $P_{2}$ and $N_{2}$ molecules. It has been possible to localize and rotationally analyze the unknown (or badly known) states coming from the configuration KKLL $(\\sigma_{g}{^{3}}s)^{2} (\\sigma_{u}{^{3}}s)^{2} (\\Pi_{u}3p)^{3} (\\sigma_{g}3p)^{2}(\\Pi_{g}3p)$, through the $b^{3}\\Pi_{g}- w\\quad{^{3}}\\Delta_{u}$ emission spectrum. This system is observed in the 2500-4500 $cm^{-1}$ region for the $N_{2}$ molecule (WU-BENESH system) and the related rotational analysis is now in progress. The same system is observed in the $4000-5700\\, cm^{-1}$ range for the $P_{2}$ molecule and the rotational analysis leads to the corresponding parameters for the$w^{3}\\Delta_{u}$ state. Molecular parameters of the $w^{3}\\Delta_{u}$ (v = 0) state of $P_{2}$ (in $cm^{-1}$) and equilibrium constants [FIGURE] The quoted uncertainty is equal to two standard deviations. a) $P=P_{\\Delta}+P_{\\Delta J}X$ b) $\\nu_{\\Delta}=0$ C) Estimated valves from the subband P heads.