The neverending story of shape resonances
The neverending story of shape resonances
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DOI：
10.1016/s0368-2048(99)00046-8
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发表时间：
1999-10-01
影响因子：
1.9
通讯作者：
Piancastelli, MN
中科院分区：
文献类型：
--
作者：
Piancastelli, MN
形状共振，它们的定义，它们的性质，它们的用途和被认为近乎奇迹的能力，在相当长的一段时间里一直是科学文献中一个相当有争议的话题。十多年前，关于这些问题的论文和会议上的热烈讨论高涨，其主要问题是，无论是孤立的还是吸附在表面上的分子，在核心能级电离阈值以上的能量中的形状共振位置是否具有键长的一些信息，有两个相反的思想流派，一个认为这种联系，如果存在的话，是相当松散的；另一个则准备利用形状共振能量与键长之间的某种线性关系，实际推导出吸附分子中未知的键长（即所谓的“带尺子的键长”）。在过去的三年里，最新的技术和仪器的发展引起了另一波形状共振纸的浪潮。根据新的实验结果，对分配形状共振的标准进行了重新考虑，一些被归类为形状共振的教科书示例的分子已被证明根本不表现出这种连续现象。因此，是时候进行一次历史调查了，希望能澄清一些仍然漂浮在文献中的误解。(C) 1999 Elsevier Science B.V.版权所有
Shape resonances, their definition, their nature, their use and supposedly almost miraculous capabilities, have been a rather controversial topic in the scientific literature for quite a long time. There was an upsurge of papers and heated discussions at conferences about these issues more than 10 years ago, the main point of which was whether the shape resonance position in energy above a core level ionization threshold in molecules, either isolated of adsorbed on surfaces, bears some information on bond lengths, with two opposite schools of thought, one maintaining that such connection, if existent at all, is rather loose, the other one ready to use some linear dependence of the shape resonance energy upon bond lengths to actually derive unknown bond distances in adsorbed molecules (the so-called 'bond-lengths-with-a-ruler' party). The latest technical and instrumental developments have given rise to another wave of shape resonance papers in the last 3 years. Criteria to assign shape resonances have been reconsidered under the light of new experimental results, and some molecules which were categorized as textbook examples for shape resonances have been shown not to exhibit such continuum phenomena at all. Therefore it is time for a historical survey which hopefully will straighten up some misconceptions still floating around in the literature. (C) 1999 Elsevier Science B.V. All rights reserved.