Electron Excitation Cross Sections for the 2s22p2 3P→2s22p2 1D Transition in O2+
Electron Excitation Cross Sections for the 2s22p2 3P→2s22p2 1D Transition in O2+
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O2+ 中 2s22p2 3P→2s22p2 1D 跃迁的电子激发截面
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
A. Chutjian
中科院分区：
文献类型：
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作者：
M. Niimura;S. Smith;A. Chutjian
报道了O2+中2s22p2 3P 0,1,2→2s22p2 1D2自旋禁跃迁和对称禁跃迁的绝对实验激发截面。这些激发对应的光发射波长分别为λ5009.0 （J = 2→2）和λ4960.9 （J = 2→1）。应用电子束和离子束合并的电子能量损失法进行了测量。据报道，质心碰撞能量范围为2.48 eV（阈值）~ 5.35 eV（或2.2 x阈值）。有人发现，在最近的26态r矩阵计算中，实验与共振的一些预测是一致的。特别是，实验证实了2.7和4.2 eV附近存在强窄共振，实验电子束能量扩散仅为0.10 eV （FWHM）即可检测到。在3.1 eV下预测的共振增强在实验中不存在。
Absolute experimental excitation cross sections are reported for the combined 2s22p2 3P 0,1,2→2s22p2 1D2 spin- and symmetry-forbidden transitions in O2+. These excitations correspond to the optical emission wavelengths λ5009.0 (J = 2 → 2) and λ4960.9 (J = 2 → 1). Use is made in the measurements of the electron energy-loss method with merged electron and ion beams. Data are reported for the center-of-mass collision energy range of 2.48 eV (threshold) to 5.35 eV (or 2.2× threshold). One finds agreement between experiment and some of the predictions of resonances in a recent 26 state R-matrix calculation. In particular, experiment confirms the presence of strong, narrow resonances near 2.7 and 4.2 eV, detectable with an experimental electron-beam energy spread of only 0.10 eV (FWHM). Resonance enhancement predicted at 3.1 eV is absent in the experiment.