Hidden double excitations in the oxygen inner-shell ionization continuum of CO
Hidden double excitations in the oxygen inner-shell ionization continuum of CO
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DOI：
10.1088/1367-2630/15/3/033003
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发表时间：
2013-03
影响因子：
3.3
通讯作者：
R. Püttner;D. Céolin;O. Travnikova;J. Palaudoux;M. Hoshino;H. Kato;Hideaki Tanaka;Y. Tamenori;C. C. Wang-C.;C. Miron;Kiyoshi Ueda;M. Piancastelli
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文献类型：
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作者：
R. Püttner;D. Céolin;O. Travnikova;J. Palaudoux;M. Hoshino;H. Kato;Hideaki Tanaka;Y. Tamenori;C. C. Wang-C.;C. Miron;Kiyoshi Ueda;M. Piancastelli
俄歇衰变光谱的CO随后O 1s电离与549.85 eV的光子，即接近顶部的形状共振，提出。他们的比较与正常俄歇光谱记录在光子能量远高于形状共振揭示了不同的功能。特别地，在O 1s−1 → b1和O 1s−1 → a1+俄歇跃迁的能量区域中，众所周知，这些跃迁由振动级数组成，在549.85 eV处记录的光谱揭示了额外的窄线。在这些俄歇光谱的详细拟合分析中，可以表明新发现的谱线没有表现出碰撞后相互作用引起的预期失真。这一观察确定这些线是由不同的机制引起的，例如双激发态的共振俄歇衰减过程。使用能量和强度参数结合互补的俄歇电子的角分布测量的过渡分配。
Auger decay spectra of CO subsequent to O 1s ionization with 549.85 eV photons, i.e. close to the top of the shape resonance, are presented. Their comparison with the normal Auger spectrum recorded at a photon energy well above the shape resonance reveals distinct features. In particular, in the energy region of the O 1s−1 → b1Π and O 1s−1 → a1Σ+ Auger transitions which are well known to consist of vibrational progressions, additional narrow lines are revealed by the spectra recorded at 549.85 eV. In a detailed fit analysis of these Auger spectra it was possible to show that the newly found lines do not exhibit the expected distortions caused by post-collision interaction. This observation identifies these lines as caused by a different mechanism, such as resonant Auger decay processes of doubly excited states. The transitions are assigned using energy and intensity arguments in combination with complementary angular distribution measurements for the Auger electrons.