Kinetic Study of the Daytime Atmospheric Fate of (Z)-3-Hexenal

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• 作者：Jia-Hua Xing ; Miyuki Ono ; Ayako Kuroda ; Kinichi Obi ; Kei Sato ; Takashi Imamura
• 刊名：The Journal of Physical Chemistry A
• 出版年：2012
• 出版时间：August 23, 2012
• 年：2012
• 卷：116
• 期：33
• 页码：8523-8529
• 全文大小：302K
• 年卷期：v.116,no.33(August 23, 2012)
• ISSN：1520-5215

文摘

Rate coefficients for three daytime atmospheric reactions of (Z)-3-hexenal (3HA)鈥攑hotolysis (J₁), reaction with OH radicals (k₂), and reaction with ozone (k₃)鈥攚ere measured at 760 Torr and 298 K using a 6 m³ photochemical reaction chamber. The UV absorption cross sections (蟽_3HA(位)) were obtained in the wavelength range 240鈥?50 nm. The photodissociation rate of 3HA relative to that of NO₂ was measured by a solar simulator at 760 Torr and was determined to be J₁/J_NO2 = (4.7 卤 0.4) 脳 10^鈥?. Using the obtained 蟽_3HA(位) and J₁/J_NO2, the effective photodissociation quantum yield was calculated to be 桅_3HA = 0.25 卤 0.06. The rate coefficient for the reaction with OH radicals was measured by the relative rate method with three reference compounds and was determined to be k₂ = (6.9 卤 0.9) 脳 10^鈥?1 cm³ molecule^鈥? s^鈥?. The rate coefficient for the reaction with ozone was measured by an absolute method and was determined to be k₃ = (3.5 卤 0.2) 脳 10^鈥?7 cm³ molecule^鈥? s^鈥?. Using the obtained rate coefficients, the daytime atmospheric lifetime of 3HA was estimated.