We apply cavity-enhanced frequency modulation absorption spectroscopy (also known as NICE-OHMS) to perform highly sensitive high-resolution spectroscopy of the sixth overtone band of NO near 797 nm. Our spectrometer provides a sensitivity corresponding to a minimum detectable absorption coefficient of 2.5×10-10 cm-1Hz-1/2, which is ~80 times worse than the ideal shot-noise limited sensitivity. Line intensities are measured for the R(7.5), R(9.5), and R(10.5) rovibrational lines in the 2Π 1/2- 2Π1/2 sub-band. From these line intensities we calculate a total vibrational band intensity of 2.2×10-6 cm-2atm-1 (at 296 K) and a vibrational transition dipole moment of 4.1 μDebye. The measured values are estimated to be accurate to within ±25%.
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