Abstract：The present article investigated the laser induced breakdown spectra of atmosphere molecules as background spectrum for the measurement of airborne particles. The authors detailedly analyzed the spectral lines of oxygen, nitrogen and hydrogen in the laser induced breakdown spectra of atmosphere molecules corresponding to the National Institute of Standards and Technology atomic spectroscopy database line data. In addition, the authors studied the intensity of emitted spectral lines induced by laser breakdown process at different time delays and signal integration width. As a result, the authors obtained the conclusion that the intensity of signal depends on variations of delay time strongly, and with a delay time more than 7 μs the interference resulting from the presence of atmosphere molecule can be reduced effectively in the application of laser induced breakdown spectroscopy. Also, the variations in signal integration width have few effects while it is longer than the instrument minimum of 1. 1 ms. Besides, this paper investigated the relative intensities of spectral lines of oxygen, nitrogen and hydrogen in the condition of different contents of water vapor in atmosphere, and the authors observed that the intensities of atomic emission line of hydrogen have a linear trend varying with the moisture in atmosphere. These results can be useful for the further application of laser induced breakdown spectroscopy in detecting and monitoring of airborne particles in the air.
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