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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Measurements of the absolute absorption cross sections of the ? ← X? Transition in organic peroxy radicals by dual-wavelength cavity ring-down spectroscopy
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Measurements of the absolute absorption cross sections of the ? ← X? Transition in organic peroxy radicals by dual-wavelength cavity ring-down spectroscopy

机译：γ的绝对吸收截面的测量。 ←X？双波长腔衰荡光谱法研究有机过氧自由基的跃迁

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摘要

We demonstrate an experimental method for the accurate measurement of the absorption cross section of transient species, such as organic peroxy radicals in which the concentration of the radicals is determined via the absorption of a stable coproduct that is produced stochiometrically. The requirements for the experimental apparatus, a dual-wavelength cavity ring-down spectrometer, and the chemical protocol for transient species generation are discussed. The capability of this approach is demonstrated by measuring the peak absorption cross section of the ethyl peroxy radical, C_2H_5O _2, whose value for the ?←X? electronic transition at 7596 cm~(-1) (λ = 1316.5 nm) is found to be σp~(EP) = 5.29(20) × 10~(-21) cm~2. These present results are compared to those obtained from other methods of measurement of σp ~(EP). Possible random and systematic errors are discussed.
机译：我们展示了一种用于准确测量瞬态物质（例如有机过氧自由基）的吸收截面的实验方法，其中自由基的浓度是通过化学计量产生的稳定副产物的吸收来确定的。讨论了对实验设备，双波长腔衰荡光谱仪的要求以及用于产生瞬态物质的化学方案。通过测量乙基过氧自由基C_2H_5O _2的峰吸收截面来证明这种方法的能力，该峰的横截面值为Δ←X？发现在7596 cm〜（-1）（λ= 1316.5 nm）处的电子跃迁为σp〜（EP）= 5.29（20）×10〜（-21）cm〜2。将这些当前结果与通过其他σp〜（EP）测量方法获得的结果进行比较。讨论了可能的随机误差和系统误差。

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