Yields and Time-of-Flight Spectra of Neutral High-Rydberg Fragments at the K Edges of the CO2 Molecule

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• 作者：Antti Kivimäki ; Christian Stråhlman ; Tomasz J. Wasowicz ; J. A. Kettunen ; Robert Richter
• 刊名：Journal of Physical Chemistry A
• 出版年：2016
• 出版时间：June 30, 2016
• 年：2016
• 卷：120
• 期：25
• 页码：4360-4367
• 全文大小：368K
• 年卷期：0
• ISSN：1520-5215

文摘

We have studied the production of neutral fragments in high-Rydberg (HR) states at the C 1s and O 1s edges of the CO₂ molecule by performing two kinds of experiments. First, the yields of neutral HR fragments were measured indirectly by ionizing such fragments in a static electric field and by collecting resulting singly charged positive ions as a function of the photon energy. Such measurements reveal not only excitations below the core ionization thresholds but also thresholds for single core–hole and shakeup photoionization. Second, we obtained the mass spectra of neutral HR fragments at selected photon energies by exploiting pulsed field ionization; they show atomic fragments C(HR) and O(HR). We discuss dissociation pathways leading to the production of neutral HR fragments in core excitation and ionization of CO₂.