High-resolution IRcavity ring-down spectroscopy of jet-cooled free radicals and other species
Literature Information
Shenghai Wu, Patrick Dupré, Terry A. Miller
Initial spectral results are reported from a newly constructed cavity ringdown spectrometer. The apparatus incorporates a slit-jet expansion, with or without a discharge, to produce cold sample molecules. High spectral resolution in both the near- and mid-IR is obtained by using stimulated Raman scattering of the pulsed amplified output of a cw Ti:Sa ring laser. Molecular spectra presented include the electronic near-IR transitions a 1Δ−g ← X 3Σ−g of O2 and B 3Πg ← A 3Σ+u of metastable N2 and vibrational overtones of H2O (polyad 2) and the OH radical. Fundamental vibrational transitions of CH3 (ν3) in the mid-IR are also observed. This apparatus has demonstrated the potential for obtaining high-resolution spectra of both reactive and non-reactive species throughout the entire IR region.
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