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arXiv physics/9904025physics.atom-ph
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赝态激发截面的研究

A study of cross sections for excitation of pseudostates

Igor Bray

摘要:

利用电子-氢散射的Temkin-Poet模型,研究了会聚密耦合(CCC)理论中所有态的激发截面的行为.在三重态通道中,发现用于激发正能态的截面在阈值附近近似为零,并且保持如此,直到将等于该态的能量的另外的能量添加到系统。这与阶跃函数假设一致[Bray,Phys. Rev. Lett. { \bf 78} 4721(1997)]并且与Bencze和Chandler的预期不一致[Phys.Rev.A { \bf 59} 3129(1999)]。此外,我们将CCC计算的三重态和单重态微分截面的结果与Baertschy等人[Phys. Rev. A(待出版)]的最新基准结果进行了比较,并发现一致的协议。

英文摘要:

Using the electron-hydrogen scattering Temkin-Poet model we investigate the behavior of the cross sections for excitation of all of the states used in the convergent close-coupling (CCC) formalism. In the triplet channel, it is found that the cross section for exciting the positive-energy states is approximately zero near-threshold and remains so until a further energy, equal to the energy of the state, is added to the system. This is consistent with the step-function hypothesis [Bray, Phys. Rev. Lett. {\bf 78} 4721 (1997)] and inconsistent with the expectations of Bencze and Chandler [Phys. Rev. A {\bf 59} 3129 (1999)]. Furthermore, we compare the results of the CCC-calculated triplet and singlet single differential cross sections with the recent benchmark results of Baertschy et al. [Phys. Rev. A (to be published)], and find consistent agreement.

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