Abstract

The atmospheric oxygen band due to magnetic dipole transitions was studied by a diode laser absorption spectroscopy combined with a Zeeman modulation technique. The high-resolution spectrum of the 0–0 band was observed with Doppler-limited resolution and compared with a previous spectrograph measurement. The Zeeman effect at low magnetic field was investigated by the Zeeman line profiles. It was found that the second-order Zeeman effect was observable in the F2 transition of the [Formula: see text] state with magnetic field as low as 150 G.

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