Abstract
The first experimental observation of the N2(G 3Δg→W 3Δu) transition is reported on here. The emission forms part of the spectrum of the so-called N2 beam afterglow, a spontaneous luminescence emitted by a molecular beam of N2 issuing from an intense d.c. discharge. Using a high performance charge-coupled device (CCD) optical multichannel detector, 18 bands of a new band system were observed with 2 Å full width at half-maximum (FWHM) resolution in the 350–650 nm region. Three well-resolved v″ progressions were analyzed. From a comparison with the known vibrational spacings in the N2(G) and N2(W) states, they could be assigned unambiguously to the N2(G→W) transition. This observation allows the energy of the N2(G) state to be determined as Te=89 505 cm−1 or 11.10 eV, thereby also fixing the location of the previously observed H(3Φu) state at Te=107 328 cm−1 or 13.31 eV.
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