Kinetic Study of the Reactions PO + O2 and PO2 + O3 and Spectroscopy of the PO Radical.

Kinetic Study of the Reactions PO + O2 and PO2 + O3 and Spectroscopy of the PO Radical.
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PO O2 和 PO2 O3 反应的动力学研究以及 PO 自由基的光谱。

DOI:
10.1021/acs.jpca.0c06106
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发表时间:
2020
期刊:
The journal of physical chemistry. A
影响因子:
--
通讯作者:
Douglas KM
Douglas KM
中科院分区:
--
文献类型:
--
作者:
Douglas KM

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使用脉冲激光光解-激光诱导荧光技术,研究了在〜190至340 K的温度范围内PO与O2以及PO2与O3的反应动力学。对于 PO + O2 的反应,有证据表明存在二体和三体出口通道,分别产生 PO2+ O 和 PO3。使用电子结构理论计算 PO + O2 和 PO2+ O3 系统的势能面,并结合 RRKM 计算来解释观察到的压力和温度依赖性。对于 PO + O2,在行星高层大气的典型压力下,P 将发生流星烧蚀,该反应实际上与压力无关,PO2+ O 的产率 >99%;速率系数可以表示为 log10(k, 120–500 K, cm3molecule–1s–1) = −13.915 + 2.470 log10(T) – 0.5020(log10(T))2,在实验温度范围 (191–339 K) 内不确定度为 ±10%。随着压力的增加,PO3 的产率增加,在 1 atm 压力和 T= 300 K 时达到 ∼90%。对于 PO2+ O3,k(188–339 K) = 3.7 × 10–11exp(−1131/T)cm3molecule–1s–1,在规定的温度范围内不确定性为 ±26%。使用 pgopher 收集并模拟波长范围 245–248 nm 的 PO 激光诱导荧光光谱,以获得 PO 的 X2π 和 A2Σ+ 态的基态和 v= 1 振动能级的新光谱常数。
The kinetics of the reactions of PO with O2and PO2with O3were studied at temperatures ranging from ∼190 to 340 K, using a pulsed laser photolysis-laser induced fluorescence technique. For the reaction of PO + O2, there is evidence of both a two- and three-body exit channel, producing PO2+ O and PO3, respectively. Potential energy surfaces of both the PO + O2and PO2+ O3systems were calculated using electronic structure theory and combined with RRKM calculations to explain the observed pressure and temperature dependences. For PO + O2, at pressures typical of a planetary upper atmosphere where meteoric ablation of P will occur, the reaction is effectively pressure independent with a yield of PO2+ O of >99%; the rate coefficient can be expressed by log10(k, 120–500 K, cm3molecule–1s–1) = −13.915 + 2.470 log10(T) – 0.5020(log10(T))2, with an uncertainty of ±10% over the experimental temperature range (191–339 K). With increasing pressure, the yield of PO3increases, reaching ∼90% at a pressure of 1 atm andT= 300 K. For PO2+ O3,k(188–339 K) = 3.7 × 10–11exp(−1131/T)cm3molecule–1s–1, with an uncertainty of ±26% over the stated temperature range. Laser-induced fluorescence spectra of PO over the wavelength range 245–248 nm were collected and simulated usingpgopherto obtain new spectroscopic constants for the ground andv= 1 vibrational levels of theX2Π andA2Σ+states of PO.
DOI: 10.1016/j.pss.2020.104926
发表时间: 2020-08
影响因子: 2.4
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