1[1]Platt U. Differential optical absorption spectroscopy (DOAS). In Sigrist M W, ed: Air monitoring by spectroscopic techniques. Chemical Analysis Series. New York: Wiley, 1994, Vol. 127:27～844
2[2]Platt U. Spectroscopic measurement of free radicals (OH, NO3)in the atmosphere. Fresenius Z Anal Chem, 1991,340:633 ～6375
