A quasi-static method for measuring the deactivation rate constants of O 2(a 1Δ g) in gas phase by IR radiation decay

• Published in: Chemical physics letters Vol. 504; no. 4; pp. 241 - 244
• Main Authors: Du, Shuyan, Leng, Jing, Wang, Junhui, Yang, Heping, Sha, Guohe, Zhang, Cunhao
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 2011
• ISSN: 0009-2614; 1873-4448
• DOI: 10.1016/j.cplett.2011.01.078

A flow-stop technique was developed to produce a quasi-static system containing gaseous O 2(a1Δ) with a reasonably high partial pressure and to measure the deactivation rate constants of O 2(a1Δ) by various gases. [Display omitted] ► A new method for measuring the deactivation rate constants of O 2(a 1Δ) in gas phase. ► It suits fairly high O 2(a 1Δ) concentration without measuring its absolute value. ► Its operation is very simple and accurate owing to high signal/noise ratio. ► The deactivation rates of O 2(a 1Δ) by gaseous D 2O is for the first time measured. A quasi-static method is developed for measuring the deactivation rate constants of O 2(a 1Δ g) in gas phase by monitoring its IR radiation decay via a flow-stop technique. This method has taken into account the energy-pooling reaction of O 2(a 1Δ) and thus suits fairly high O 2(a 1Δ) concentration without identifying its absolute value, leading to simpler operation and higher signal/noise ratio. Utilizing this method, the O 2(a 1Δ) deactivation rate by D 2O is for the first time measured to be 2.10 ± 0.18 × 10 −18 cm 3 s −1, while those for O 2( X 3 Σ g - ), H 2O, H 2 and D 2 are found to agree well with the data in literature.