60-GHz oxygen band: Precise experimental profiles and extended absorption modeling in a wide temperature range

The 60-GHz band of atmospheric oxygen was studied in the temperature range of −28° to +60 °C at atmospheric pressure by means of a resonator spectrometer with absorption-variation sensitivity of 0.002 dB/km. The experimental data obtained have sufficient signal-to-noise ratio to take second-order mixing into account, increasing the accuracy of the millimeter-wave propagation model (MPM). A refined set of mixing coefficients for the model is derived from the new data and presented. The fidelity of the new model to the spectrometer data is generally better than 2% between 54 and 65 GHz.

► 60-GHz molecular-oxygen band was investigated at temperatures from −28 to +60 °C. ► Band profiles are recorded at atmosphere pressure and have high signal-to-noise ratio. ► High SNR allows extension of the MPM model by considering second-order mixing effect. ► The fidelity of the new model to obtained data is better than MPM one.