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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Negative Ion Chemistry of Ozone in the Gas Phase
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Negative Ion Chemistry of Ozone in the Gas Phase

机译：气相中臭氧的负离子化学

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A novel ozone source was developed to study the negative ion chemistry of ozone in the gas phase, Rate constants and product ion branching fractions are reported for 17 negative ion-molecule reactions involving ozone (O_3). This is the most comprehensive set of O_3 reactions with negative ions to date. The reactions proceed primarily through charge transfer and O atom transfer. The reaction rate constants for O~-, O_2~-, and OH~- are large and approximately equal to the thermal energy capture rate constant given by the Su-Chesnavich equation based on average dipole orientation theory. The negative ions NO_2~-, CO_4~-, SF_6~-, and PO_2~- are somewhat less reactive, reacting at approximately 20-50% of the thermal capture rate. The hydrofluorocarbon ions CF_3~- and C_2F_5~- react at 80% of the thermal capture rate, and F~- is the major product ion formed. NO_3~-, CO_3~-, CF_3O~-, F~-, Cl~-, and Br~- are found to be unreactive with rate constants < 5 * 10~(-12) cm~3 s~(-1), which is the present detection limit of our apparatus using this ozone source. The I~- ion was observed to cluster with O_3 to form IO_3~- with a rate constant of approximately 1 * 10~(-11) cm~3 s~(-1), which is a factor of 2 above our detection limit and no other product channels were observed. All of the anions listed above showed no reactivity, k < 5 * 10~(-13) cm~3 s~(-1), with O_2.
机译：开发了一种新型的臭氧源来研究气相中臭氧的负离子化学性质，报道了涉及臭氧（O_3）的17种负离子-分子反应的速率常数和产物离子支化分数。这是迄今为止最全面的带有负离子的O_3反应。反应主要通过电荷转移和O原子转移进行。 O〜-，O_2〜-和OH〜-的反应速率常数很大，大约等于Su-Chesnavich方程基于平均偶极子定向理论给出的热能捕获速率常数。负离子NO_2〜-，CO_4〜-，SF_6〜-和PO_2〜-的反应性略低，它们以热捕获率的大约20-50％进行反应。氢氟碳离子CF_3〜-和C_2F_5〜-以热捕获率的80％反应，而F〜-是形成的主要产物离子。发现NO_3〜-，CO_3〜-，CF_3O〜-，F〜-，Cl〜-和Br〜-不反应，速率常数<5 * 10〜（-12）cm〜3 s〜（-1） ，这是我们使用此臭氧源的设备目前的检测极限。观察到离子以O_3团聚形成IO_3〜-，速率常数约为1 * 10〜（-11）cm〜3 s〜（-1），这是我们检测极限的2倍没有观察到其他产品渠道。上面列出的所有阴离子均与O_2无反应性，k <5 * 10〜（-13）cm〜3 s〜（-1）。

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