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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Vibrational Relaxation of O_3(ν_2) by O(~3P)
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Vibrational Relaxation of O_3(ν_2) by O(~3P)

机译：O（〜3P）对O_3（ν_2）的振动弛豫

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摘要

Laboratory measurements of the rate coefficient for quenching of O_3(ν_2) by ground-state atomic oxygen, k_O(ν_2), at room temperature are presented. k_O(ν_2) is currently not well known and is necessary for appropriate nonlocal thermodynamic equilibrium modeling of the upper mesosphere and lower thermosphere. In this work, a 266 nm laser pulse photolyzes a small amount of O_3 in a slow-flowing gas mixture of O_3, Xe, and Ar. This process simultaneously produces atomic oxygen and increases the temperature of the gas mixture slightly, thereby increasing the population in the O_3(ν_2) state. Transient diode laser absorption spectroscopy is used to monitor the populations of the O_3(ν_2) and ground vibrational states as the system re-equilibrates. Relaxation rates are measured over a range of quencher concentrations to extract the rate coefficient of interest. The value of k_O(ν_2) was determined to be (2.2 ± 0.5) × 10~(?12) cm~3 s~(?1).
机译：提出了在室温下通过基态原子氧k_O（ν_2）淬灭O_3（ν_2）的速率系数的实验室测量结果。 k_O（ν_2）目前尚不为人所知，并且对于上部中层和下部热层的适当的非局部热力学平衡建模是必需的。在这项工作中，一个266 nm的激光脉冲在O_3，Xe和Ar的缓慢流动的气体混合物中光解了少量的O_3。该过程同时产生原子氧，并略微提高了混合气体的温度，从而增加了O_3（ν_2）状态下的原子团。当系统重新平衡时，使用瞬态二极管激光吸收光谱法监测O_3（ν_2）的数量和地面振动状态。在淬灭剂浓度范围内测量弛豫速率，以提取感兴趣的速率系数。确定k_O（ν_2）的值为（2.2±0.5）×10〜（？12）cm〜3 s〜（？1）。

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