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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Measurements of rate constants for the OH reactions with bromoform (CHBr_3), CHBr_2Cl, CHBrCl_2, and epichlorohydrin (C_3H_5C_(lO))
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Measurements of rate constants for the OH reactions with bromoform (CHBr_3), CHBr_2Cl, CHBrCl_2, and epichlorohydrin (C_3H_5C_(lO))

机译:与溴仿(CHBr_3),CHBr_2Cl,CHBrCl_2和表氯醇(C_3H_5C_(10))进行OH反应的速率常数的测量

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Measurements of the rate constants for the gas phase reactions of OH radicals with bromoform (CHBr_3) and epichlorohydrin (C_3H_5C_(lO)) were performed using a flash photolysis resonance-fluorescence technique over the temperature range 230-370 K. The temperature dependences of the rate constants can be represented by the following expressions: kBF(230-370 K) = (9.94 ± 0.76) × 10~(-13) exp[-(387 ± 22)/T] cm~3 molecule~(-1) s~(-1) and kECH(230-370 K) = 1.05 × 10~(-14)(T/298)~(5.16) exp(+1082/T) cm~3 molecule~(-1) s~(-1). Rate constants for the reactions of OH with CHCl_2Br and CHClBr_2 were measured between 230 and 330 K. They can be represented by the following expressions: kDCBM(230-330 K) = (9.4 ± 1.3) × 10~(-13) exp[-(513 ± 37)/T] cm~3 molecule~(-1) s~(-1) and kCDBM(230-330 K) = (9.0 ± 1.9) × 10~(-13) exp[-(423 ± 61)/T] cm~3 molecule~(-1) s~(-1). The atmospheric lifetimes due to reactions with tropospheric OH were estimated to be 57, 39, 72, and 96 days, respectively. The total atmospheric lifetimes of the Br-containing methanes due to both reaction with OH and photolysis were calculated to be 22, 50, and 67 days for CHBr_3, CHClBr_2, and CHCl_2Br, respectively.
机译:OH自由基与溴仿(CHBr_3)和环氧氯丙烷(C_3H_5C_(10))的气相反应速率常数的测量是使用快速光解共振荧光技术在230-370 K的温度范围内进行的。速率常数可用以下表达式表示:kBF(230-370 K)=(9.94±0.76)×10〜(-13)exp [-(387±22)/ T] cm〜3分子〜(-1) s〜(-1)和kECH(230-370 K)= 1.05×10〜(-14)(T / 298)〜(5.16)exp(+ 1082 / T)cm〜3分子〜(-1)s〜 (-1)。测量了OH与CHCl_2Br和CHClBr_2反应的速率常数,范围为230至330K。它们可以用以下表达式表示:kDCBM(230-330 K)=(9.4±1.3)×10〜(-13)exp [ -(513±37)/ T] cm〜3分子〜(-1)s〜(-1)和kCDBM(230-330 K)=(9.0±1.9)×10〜(-13)exp [-(423 ±61)/ T] cm〜3分子〜(-1)s〜(-1)。与对流层OH反应的大气寿命估计分别为57、39、72和96天。计算得出,由于与OH反应和光解作用,含Br甲烷的总大气寿命分别为22天,50天和67天,这对于CHBr_3,CHClBr_2和CHCl_2Br而言。

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