We report oxygen K-shell photoabsorption measurements in CO 2 plasmas, using a table-top laser produced plasma soft x-ray (SXR) and extreme ultraviolet source. Significant differences are observed between the photoabsorption spectra of the neutral CO 2 molecule and photoionized CO 2 plasmas, as new spectral features emerge in the case of the latter. These features are attributed to ##IMG## [http://ej.iop.org/images/0953-4075/53/10/105701/jpbab78abieqn1.gif] {$1s\longrightarrow 2p$} photoexcitation in O, O + , O 2+ species identified with the aid of calculations performed with the Cowan suite of atomic structure codes. Such signatures of atomic ions in the photoionized plasma point to the fragmentation of the parent molecule upon absorption of an SXR photon.

中文翻译：

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光电离CO 2等离子体的氧K壳光吸收光谱

我们报告使用台式激光产生的等离子体软X射线（SXR）和极端紫外线源在CO 2等离子体中进行氧K壳光吸收测量。观察到中性CO 2分子的光吸收光谱与光电离的CO 2等离子体之间的显着差异，因为在后者的情况下出现了新的光谱特征。这些功能归因于## IMG ## [http://ej.iop.org/images/0953-4075/53/10/105701/jpbab78abieqn1.gif] {$ 1s \ longrightarrow 2p $}在O，O中的光激发+，借助Cowan原子结构代码套件进行的计算确定了O 2+物种。光电离等离子体中原子离子的这种特征指向吸收SXR光子后母体分子的断裂。