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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Kinetic study of the daytime atmospheric fate of (Z-)-3hexenal
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Kinetic study of the daytime atmospheric fate of (Z-)-3hexenal

机译：（Z-）-3hexenal白天大气命运的动力学研究

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摘要

Rate coefficients for three daytime atmospheric reactions of (Z-)-3hexenal (3HA)-photolysis (J _1), reaction with OH radicals (k _2), and reaction with ozone (k _3)-were measured at 760 Torr and 298 K using a 6 m ~3 photochemical reaction chamber. The UV absorption cross sections (σ3HA(λ)) were obtained in the wavelength range 240-350 nm. The photodissociation rate of 3HA relative to that of NO _2 was measured by a solar simulator at 760 Torr and was determined to be J _1/J _(NO2) = (4.7 ± 0.4) × 10 ~(-3). Using the obtained σ3HA(λ) and J _1/J _(NO2), the effective photodissociation quantum yield was calculated to be φ _(3HA) = 0.25 ± 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 k _2 = (6.9 ± 0.9) × 10 ~(-11) cm ~3 molecule ~(-1) s ~(-1). The rate coefficient for the reaction with ozone was measured by an absolute method and was determined to be k _3 = (3.5 ± 0.2) × 10 ~(-17) cm ~3 molecule ~(-1) s ~(-1). Using the obtained rate coefficients, the daytime atmospheric lifetime of 3HA was estimated.
机译：在760 Torr和298 K下测量了（Z-）-3己烯（3HA）-光解（J _1），与OH自由基（k _2）和与臭氧（k _3）的三个白天大气反应的速率系数使用6 m〜3的光化学反应室。在240-350nm的波长范围内获得了UV吸收截面（σ3 HA（λ））。通过太阳模拟器在760托下测量3HA相对于NO _2的光解离速率，并确定为J _1 / J _（NO2）=（4.7±0.4）×10〜（-3）。使用获得的σ3HA（λ）和J _1 / J _（NO2），计算出的有效光解离量子产率为φ_（3HA）= 0.25±0.06。使用三种参考化合物的相对速率法测量与OH自由基反应的速率系数，确定为k _2 =（6.9±0.9）×10〜（-11）cm〜3分子〜（-1）s 〜（-1）。通过绝对方法测量与臭氧反应的速率系数，并确定为k _3 =（3.5±0.2）×10〜（-17）cm〜3分子〜（-1）s〜（-1）。使用获得的速率系数，估算3HA的白天大气寿命。

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