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The CW-Cavity Ring Down Spectroscopy (CW-CRDS) technique has been used to record the high sensitivity absorption spectrum of the a 1 Δ g –X 3 Σ g− band of oxygen near 1.27μm. The spectra were obtained between 7640 and 7917cm −1 with “natural” oxygen and with a sample highly enriched in 18 O. The absolute intensities of 376 and 643 oxygen transitions...
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