Measurements of atmospheric NO<sub>3</sub> radicals in Hefei using LED-based long path differential optical absorption spectroscopy

Measurements of atmospheric NO₃ radicals in Hefei using LED-based long path differential optical absorption spectroscopy

Lu Xue^{1, 2}, Qin Min^{1, †,}, Xie Pin-Hua^{1, 3, ‡,}, Duan Jun¹, Fang Wu¹, Ling Liu-Yi^{1, 4}, Shen Lan-Lan¹, Liu Jian-Guo^{1, 3}, Liu Wen-Qing^{1, 3}

(a) and (b) NO₃ fitting results with LED temperatures being stable (absorption spectrum and reference spectrum are taken at the same LED temperature of 20 °). (c) and (d) NO₃ fitting results with LED temperatures changed (absorption spectrum and reference spectrum are taken at LED temperatures of 20 °C and 40 °C, respectively).