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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Two-Photon Transitions in CW-ENDOR Spectra of Radicals in Fluid Solution
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Two-Photon Transitions in CW-ENDOR Spectra of Radicals in Fluid Solution

机译：流体溶液中自由基的CW-ENDOR光谱中的双光子跃迁

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摘要

The radical anion of duroquinone (2,3,5,6-tetramethyl-1,4-benzoquinone) was used as a model compound to describe the low-frequency (LF) ENDOR lines observed in many radical systems. These LF lines are shown to arise from two-photon transitions, and they occur because of the rapid cross-relaxation rates and dynamical processes of the system. The LF lines occur when the radio frequency (RF) and microwave frequency match the energy of an adjacent EPR transition. In practical work, LF ENDOR lines disturb the determination of nuclei such as ~2H, ~(13)C, Na, and K, whose Larmor frequencies are in that region. Under certain conditions, two-photon transitions were also observed in the normal proton coupling region. A method for distinguishing normal ENDOR lines from two-photon transitions is given. The method is based on the different shape of an ENDOR-induced EPR spectrum when it is measured from two-photon-transition ENDOR lines.
机译：使用杜罗醌（2,3,5,6-四甲基-1,4-苯醌）的自由基阴离子作为模型化合物来描述在许多自由基系统中观察到的低频（LF）ENDOR谱线。这些LF线显示为来自两个光子跃迁，并且由于快速的交叉松弛速率和系统的动态过程而出现。当射频（RF）和微波频率与相邻EPR跃迁的能量匹配时，就会出现LF线。在实际工作中，LF ENDOR谱线干扰了诸如拉莫尔频率在该区域的〜2H，〜（13）C，Na和K等原子核的确定。在某些条件下，在正常质子偶合区域也观察到了两个光子跃迁。给出了一种区分正常ENDOR线和双光子跃迁的方法。从两光子跃迁ENDOR线测量时，该方法基于ENDOR诱导的EPR光谱的不同形状。

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