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Ionization photophysics and Rydberg spectroscopy of diacetylene

机译:二乙炔的电离光物理和Rydberg光谱

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Photoionization of diacetylene was studied using synchrotron radiation over the range 8-24 eV, with photoelectron-photoion coincidence (PEPICO) and threshold photoelectron-photoion coincidence (TPEPICO) techniques. Mass spectra, ion yields, total and partial ionization cross-sections were measured. The adiabatic ionization energy of diacetylene was determined as IEad = (10.17 ± 0.01) eV, and the appearance energy of the principal fragment ion C4H+ as AE = (16.15 ± 0.03) eV. Calculated appearance energies of other fragment ions were used to infer aspects of dissociation pathways forming the weaker fragment ions , C3H+, and C2H+. Structured autoionization features observed in the PEPICO spectrum of diacetylene in the 11-13 eV region were assigned to vibrational components of three new Rydberg series, R1(nsσg, n = 4-11), R2(ndσg, n = 4-7) and R3(ndδg, n = 4-6) converging to the A2Πu state of the cation, and to a new series R′1(nsσg, n = 3) converging to the state of the cation. The autoionization mechanisms and their consistence with specific selection rules are discussed.View full textDownload full textRelated var addthis_config = { ui_cobrand: "Taylor & Francis Online", services_compact: "citeulike,netvibes,twitter,technorati,delicious,linkedin,facebook,stumbleupon,digg,google,more", pubid: "ra-4dff56cd6bb1830b" }; Add to shortlist Link Permalink http://dx.doi.org/10.1080/00268976.2012.704084
机译:联乙炔的光电离研究使用同步加速器辐射在8-24 eV范围内,采用光电子-光电子符合(PEPICO)和阈值光电子-光电子符合(TPEPICO)技术。测量质谱,离子产率,总和部分电离截面。乙炔的绝热电离能确定为IE ad =((10.17±0.01))eV,主片段的出现能离子C 4 H + 作为AE等于(16.15±0.03)eV。其他碎片离子的计算出的表观能量被用于推断形成较弱碎片离子,C 3 H + 和C 2 的解离途径的各个方面H + 。在11-13 eV区域中的乙炔的PEPICO光谱中观察到的结构化的自电离功能被分配给三个新的Rydberg系列,R1(nsÏf g ,n ==的振动分量4-11),R2(nd g ,n == 4-7)和R3(nd g ,n ==≥ 4-6)收敛到阳离子的A 2 α u 状态,并收敛到新的序列Râ€1(nsσ g , n = 3)收敛到阳离子的状态。讨论了自动电离机制及其与特定选择规则的一致性。查看全文下载全文相关var addthis_config = {ui_cobrand:“泰勒和弗朗西斯在线”,servicescompact:“ citeulike,netvibes,twitter,technorati,delicious,linkedin,facebook,stumbleupon, digg,google,more“,发布号:” ra-4dff56cd6bb1830b“};添加到候选列表链接永久链接http://dx.doi.org/10.1080/00268976.2012.704084

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