Study on gaseous CS2 using laser-induced fluorescence

ＳｔｕｄｙｏｎｇａｓｅｏｕｓＣＳ＿２ｕｓｉｎｇｌａｓｅｒ－ｉｎｄｕｃｅｄｆｌｕｏｒｅｓｃｅｎｃｅＰａｎＺｈｅ；ＺｈａｎｇＹｕｅ；ＤｅｎｇＧｕｏｈｏｎｇ；ＰａｎＸｕｎｘｉ，ＨｏｕＨｕｉｑｉ；ＬｉＣｈａｎｇｌｉｎ（ＥｎｖｉｒｏｎｍｅｎｔａｌＳｃｉｅｎｃｅ...

Study on gaseous CS_2 using laser-induced fluorescence

The fluorescence of gaseous CS₂ was studied by laser - induced fluorescence (LIF) method. Aworking curve of gaseous CS₂ was obtained and the detection limit was less than 1 ppm. The time - resolvedfluorescence emission spectrum of CS₂ vapor was recorded from 350 nm to 550 nm which consists of a discretesharp band and a continuous part. The fluorescence lifetimes of the sharp band and the continuous part weremeasured to be 4 -5 and 17 microseconds respectively. The self - quenching constant (Q) of CS₂ obtained is 80-150 torr^-1) , and the quenching constants(Qm) of CS₂ by foreign gases, CO₂ , O₂ , N₂ , are 89. 5 , 45. 6 and30 torr^-1 , respectively. All the data greatly help to understand the reactions of CS_2 in the atmosphere. Theaerosol formation in CS₂ vapor after long time laser irradiation was also observed , and the mechanism of theaerosol formation was preliminarily discussed.