Abstract
The optical spectrum of N2O in the region from 80 000 to 87 000 cm−1 has been investigated by two- and three-photon resonant multiphoton ionization mass spectrometry. State symmetry identification has been performed by the use of linearly and circularly polarized light in both two- and three-photon absorption, conclusively confirming the assignment of the spectrum as that of the 3pσ 1Π Rydberg state of N2O. The new spectra and polarization experiments also permit observation and analysis of previously unreported vibronic coupling effects in this state. Mass spectral data reveal significant variation in the degrees of fragmentation into NO+ and N+2 as a function of vibrational and rotational excitation in the intermediate state. An apparent progression of a previously unreported second electronic band is also observed and for which a possible assignment is discussed.
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