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Photodissociation of the tert-butyl Radical,C_4H_9

机译:叔丁基自由基C_4H_9的光解离

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摘要

We report results on the photodissociation dynamics of the tert-butyl radical,C_4H_9.A beam of internally cold radicals is generated by supersonic jet flash pyrolysis of azo-t-butane.Upon optical excitation,the radical dissociates into 2-methylpropene (iso-butene) and a hydrogen atom that is detected by time-resolved photoionization.By varying the excitation wavelength between 355 and 266 nm,unimolecular dissociation rates are obtained as a function of excitation energy.Whereas at low excitation energies,the rates are on the order of 10~8 s~(-1),in agreement with simple RRKM calculations.However,the reaction slows down at excitation wavelengths shorter than 329 nm.The data are discussed in light of previous results on the ethyl radical.
机译:我们报告了叔丁基自由基C_4H_9的光解离动力学结果。通过超声波对偶氮叔丁烷的超音速喷射热解产生了内部冷自由基束。在光激发下,自由基解离为2-甲基丙烯(异-丁烯)和一个通过时间分辨光电离检测到的氢原子。通过在355 nm和266 nm之间改变激发波长,可以获得单分子解离速率,它是激发能的函数。而在低激发能下,速率约为大约10〜8 s〜(-1)的时间,与简单的RRKM计算一致。但是,在小于329 nm的激发波长下,反应速度减慢。根据先前关于乙基的结果讨论数据。

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