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首页> 外文期刊>The Journal of Chemical Physics >Photolysis wavelength dependence of the translational anisotropy and the angular momentum polarization of O_2(a~1DELTA_g) formed from the UV photodissociation of O_3
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Photolysis wavelength dependence of the translational anisotropy and the angular momentum polarization of O_2(a~1DELTA_g) formed from the UV photodissociation of O_3

机译：由O_3的紫外线光解形成的平移各向异性的光解波长依赖性和O_2（a〜1DELTA_g）的角动量极化

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摘要

The translational anisotropy and angular momentum polarization of the O_2(a~1DELTA_g,nu=0;J=15-27) molecular photofragment produced from the UV photodissociation of O_3 in the range from 270 to 300 nm have been determined using resonance-enhanced multiphoton ionization in conjunction with time-of-flight mass spectrometry.At the shortest photolysis wavelengths used,the fragments exhibit the anisotropic vector correlations expected from a prompt dissociation via the ~1B_2<- ~1A_1 transition.Deviations from this behavior are observed at longer photolysis wavelengths with,in particular,the angular momentum orientation showing a significant reduction in magnitude.This indicates that the dissociation can no longer be described by a purely impulsive model and a change in geometry of the dissociating molecule is implied.This observation is substantiated by the variation of the translational anisotropy with photolysis wavelength.We also observe that the bipolar moments describing the angular momentum polarization of the odd J states probed are consistently lower in magnitude than those of the even J states and that this variation is observed for all photolysis wavelengths.
机译：利用共振增强多光子测定了O_3在270至300 nm范围内的紫外光解离所产生的O_2（a〜1DELTA_g，nu = 0; J = 15-27）分子碎片的平移各向异性和角动量极化电离与飞行时间质谱联用。在使用的最短光解波长下，碎片表现出各向异性的矢量相关性，该矢量相关性是通过〜1B_2 <-〜〜1A_1跃迁而迅速解离所预期的。尤其是角动量取向的波长在幅度上显着减小。这表明离解​​不再可以用纯脉冲模型来描述，并且离解分子的几何形状发生了变化。平移各向异性随光解波长的变化。我们还观察到描述极性Mo的双极矩所探测到的奇数J状态的态偏振的幅度始终低于偶数J状态的ment态偏振，并且对于所有光解波长都观察到这种变化。

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