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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Methyl Iodide Photodissociation at 193 nm:The I(2P_(1/2))Quantum Yield
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Methyl Iodide Photodissociation at 193 nm:The I(2P_(1/2))Quantum Yield

机译：碘甲烷在193 nm处的光解离：I（2P_（1/2））量子产率

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摘要

Methyl iodide photolysis at 193 nm has been studied through probing the I(~2P_(1/2)-~2P_(3/2))transition in the atomic iodine photofragment using diode laser spectroscopy.The I(~2P_(1/2))quantum yield has been determined through two different diode laser techniques and then compared.Frequency-modulated diode laser based absorption spectroscopy was used to extract nascent Doppler lineshapes from which an I(~2P_(1/2))quantum yield of unity is inferred.However when diode laser gain/absorption measurements were made,an I(~2P_(1/2))quantum yield of 0.68±0.04 was found.The reason for this discrepancy is shown to lie in the diode laser gain/absorption method.Molecular iodine is found to be formed during the experiment via atomic iodine recombination and then in turn dissociates to produce both I(~2P_(1/2))and I(~2P_(3/2)),thus distorting the returned quantum yield.This conclusion is supported both by the reduction of the I(~2P_(1/2))quantum yield with number of photolysis laser shots when measured using this technique and by the presence of fluoresence which is shown to have excited-state lifetimes and quenching rates that are consistent with those previously measured for the D and D'states of molecular iodine.
机译：通过使用二极管激光光谱探测原子碘光碎中的I（〜2P_（1/2）-〜2P_（3/2））跃迁，研究了193 nm处的甲基碘的光解.I（〜2P_（1/2） ））量子产率已通过两种不同的二极管激光技术确定，然后进行了比较。基于频率调制二极管激光的吸收光谱用于提取新生的多普勒线形，从中可以得出I（〜2P_（1/2））量子产率为1但是，当进行二极管激光器增益/吸收率测量时，发现I（〜2P_（1/2））量子产率为0.68±0.04。这种差异的原因在于二极管激光器增益/吸收率方法。发现分子碘在实验过程中通过原子碘重组形成，然后解离生成I（〜2P_（1/2））和I（〜2P_（3/2）），从而扭曲了返回的量子当测量时，I（〜2P_（1/2））量子产率随光解激光发射次数的减少而得到支持。使用这种技术并通过荧光的存在可以确保荧光的激发态寿命和猝灭速率与先前对分子碘的D和D'态测得的一致。

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