Abstract
We report the first field-free Lamb-dip frequency measurements on nitric oxide (NO) fundamental-band transitions. Single hyperfine components of the infrared lines around 5.3 μm (57 THz) are resolved and measured with absolute accuracies between 20 and 37 kHz. Our spectrometer employs tunable microwave sidebands added to CO-laser lines. The laser frequency is measured against combination frequencies of two stabilized CO2lasers. The results are fitted together with other data, including fine and hyperfine structure. The accuracy of the measurements improves the quality of the frequency values for the nitric oxide fundamental band for calibration and atmospheric measurement purposes. Molecular constants and calibration tables are given.
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