Determination of the Rate Constants of the Reactions of NO3 Radical with CF3I and I(2P3/2)
Determination of the Rate Constants of the Reactions of NO3 Radical with CF3I and I(2P3/2)
复制标题
NO3自由基与CF3I和I(2P3/2)反应速率常数的测定
DOI：
10.1002/kin.20705
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发表时间：
2012
影响因子：
1.5
通讯作者：
Takashi Ishiwata
中科院分区：
文献类型：
--
作者：
Yukio Nakano;Kengo Sadamori;Takashi Ishiwata
利用傅里叶变换红外光谱仪(FTIR)和长光程气体室测定了NO3自由基与CF3I反应的速率常数。结果表明，298K时的速率常数上限为-lt；2.2×10−18cm3分子−1s−1 in 100Torr，表明排放到大气中的CF3I是在夜间积累的。用时间分辨腔衰荡光谱测定了NO_3与I(2P_3/2)反应的速率常数。在298K总压为100Torr-500Torr范围内，该反应的速率常数与压力无关，测得其为(3.9±1.0)×10−~(11)cm~3分子−_1s−~(1)。从这个速率常数可以看出，NO_3自由基与I(2P_3/2)的反应对I_(2P_3/2)的损失和IO自由基在大气中的形成周期没有太大影响。©2012 Wiley期刊，Inc.Int J Chem Knet 44：649-660,2012
The rate constant of the reaction of NO3radical with CF3I was determined by a relative rate method using a Fourier transform infrared (FTIR) spectrometer smog chamber with a long path length gas cell. As a result, the upper limit of the rate constant was determined to be <2.2 × 10−18cm3molecule−1s−1in 100 Torr of total pressure at 298 K, which suggests that CF3I emitted into the atmosphere accumulates during night. The rate constant of the reaction of NO3with I(2P3/2) was also measured using time‐resolved cavity ring‐down spectroscopy. The rate constant showed no pressure dependence in the range of 100–500 Torr of total pressure at 298 K and was determined to be (3.9 ± 1.0) × 10−11cm3molecule−1s−1. The present result is different from the previous ones and is about half of that reported most recently. From this rate constant, it is likely that the reaction of NO3radical with I(2P3/2) does not have a much influence on the loss of I(2P3/2) and the formation cycle of IO radical in the atmosphere. © 2012 Wiley Periodicals, Inc. Int J Chem Kinet 44: 649–660, 2012