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首页> 外文期刊>Physical chemistry chemical physics: PCCP >Photodissociation of singlet oxygen in the UV region
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Photodissociation of singlet oxygen in the UV region

机译：单线态氧在紫外区的光解离

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Photodissociation of singlet oxygen, O2 a~1△_g, by ultraviolet radiation in the region from 200 to 240 nm has been investigated using velocity map imaging of the atomic oxygen photofragments. Singlet oxygen molecules are generated in a pulsed discharge and studied by one-laser photodissociation and detection around 226 nm as well as two color photodissociation at various wavelengths in the range from 200 to 240 nm. A simple model of the discharge on and off signal indicates efficient conversion of O2 X~3Σ_g~-(v = 0) in the parent beam to O2 a~1△_g(v = 0-2). Minute amounts of highly excited vibrational levels of ground state O2 X~3Σ_g~- (v > 0) are detected but no evidence is found for production of the O2 b~1Σ_g~+ state. Over the decreasing wavelength range 240-200 nm the a~1△_g-state signal relative to the X~3Σ_g~-(v = 0) signal decreases strongly. Around 226 nm the a~1△_g (v = 0-2) states averaged branching ratio percentage for O(~3P_Jj = 2:1:0) is found to be 56:36:8 (±5%), respectively. The anisotropy parameter for photodissociation of a~1△_g(v = 0-2) averages to β = 1.3 ± 0.4. The a~1△_g(v = 0) photodissociation cross section is found to 3-10 times stronger than theory predicts. Furthermore, the photodissociation image shows a strong parallel character, (i.e., transition moment parallel to the molecular axis) while theory predicts a predominantly negative character.
机译：利用原子氧光片段的速度图成像技术研究了单线态氧O2 a〜1△_g在200至240 nm范围内的紫外线辐射引起的光解离。单线态氧分子在脉冲放电中产生，并通过单激光光解和在226 nm左右的检测以及在200至240 nm范围内的各种波长下的两种颜色的光解进行研究。放电开关信号的简单模型表明母束中的O2 X〜3Σ_g〜-（v = 0）有效转换为O2 a〜1△_g（v = 0-2）。检测到极少量的基态O2 X〜3Σ_g〜-（v> 0）的高激发振动能级，但没有发现产生O2 b〜1Σ_g〜+态的证据。在减小的波长范围240-200 nm范围内，相对于X〜3Σ_g〜-（v = 0）信号，a〜1△_g状态信号急剧减小。发现在226 nm附近，a〜1△_g（v = 0-2）状态的O（〜3P_Jj = 2：1：0）的平均分支比百分比分别为56：36：8（±5％）。 a〜1△_g（v = 0-2）的光解离的各向异性参数平均为β= 1.3±0.4。发现a〜1△_g（v = 0）的光解截面比理论预测的强3-10倍。此外，光离解图像显示出很强的平行性（即，平行于分子轴的跃迁矩），而理论上预测主要是负性。

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