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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Electronic state resolved PEPICO spectroscopy of pyrimidine
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Electronic state resolved PEPICO spectroscopy of pyrimidine

机译：嘧啶的电子态分辨PEPICO光谱

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Photoionization techniques, such as photoelectron spectroscopy (PES) and photoionization mass spectrometry (PIMS), are well-established and powerful methods for studying the spectroscopy of isolated bio-organic molecules and their fate under vacuum ultraviolet (VUV) irradiation. Measuring the energy selected electron leaving a molecular ion in coincidence with other particles, such as ions, can provide even deeper insights into the mechanisms of the interaction of molecules with ionizing radiation. We have thus implemented the electronic state resolved photoelectron photoIon coincidence (ER-PEPICO) technique in our laboratory. Here, we report our newly constructed apparatus, and its application for characterizing fragmentation processes occurring in pyrimidine. Ionization of the two highest molecular orbitals (MOs) of the valence band does not lead to fragmentation of the resulting ion. The third band observed in photoemission is due to the ionization of two MOs, and leads mainly to the formation of the parent ion. The next three electronic states are not resolved experimentally and appear as a single band; their ionization leads to fragments of mass to charge ratio m/e = 53 (C3H3N+), while ionization of deeper lying MOs leads mostly to m/e = 26 (C2H2+). We compare our data with previous non-coincidence photoionization results and describe the problems encountered and their solutions.
机译：光电离技术，例如光电子能谱（PES）和光电离质谱（PIMS），是研究分离的有机有机分子及其在真空紫外（VUV）辐射下的命运的光谱学的行之有效的有效方法。测量离开分子离子并与其他粒子（例如离子）同时发生的能量选择电子，可以提供对分子与电离辐射相互作用机理的更深入了解。因此，我们在实验室中实施了电子状态分辨光电子重合技术（ER-PEPICO）。在这里，我们报告了我们新构建的仪器及其在表征嘧啶中发生的断裂过程中的应用。价带的两个最高分子轨道（MOs）的电离不会导致所得离子的碎片化。在光发射中观察到的第三条带是由于两个MO的电离，主要导致母离子的形成。接下来的三个电子状态无法通过实验解析，而是显示为单个波段;它们的电离会导致质荷比碎片m / e = 53（C3H3N +），而更深的MOs的电离会导致m / e = 26（C2H2 +）。我们将我们的数据与以前的非重合光电离结果进行比较，并描述遇到的问题及其解决方案。

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