<title>Detection of nitrogen oxides by high-resolution near-infrared absorption spectroscopy</title>

Near-infrared absorption spectra of NO, NO₂ and N₂O were observed in the wavelength region between 1.2 and 1.9 micrometers using a high-resolution Fourier-transform spectrometer, and we have obtained precise absorption data which are useful for tunable diode laser absorption spectroscopy (TDLAS). Furthermore, the NO and N₂O were detected by means of TDLAS method for the first time using InGaAs-DFB diode lasers which were designed to access absorption lines at wavelengths of 1.798 and 1.766 micrometers respectively.