Applications of molecular Rydberg states in chemical dynamics and spectroscopy
Applications of molecular Rydberg states in chemical dynamics and spectroscopy
复制标题
分子里德伯态在化学动力学和光谱学中的应用
DOI：
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发表时间：
2004
期刊：
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通讯作者：
T. Softley
中科院分区：
文献类型：
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作者：
T. Softley
处于高里德堡态的分子，其中一个电子被激发到大平均半径的类氢轨道，与基态分子相比，具有许多不寻常的性质。这些属性，这是在这篇文章中，使它们适合于不同的和越来越多的应用在化学动力学。本文介绍了利用高分辨光谱和理论研究分子里德伯态的最新方法，包括电场效应。里德伯态的一个重要特征是对外场扰动的高敏感性，这不仅对可观测的能级、光谱强度和寿命有深刻的影响，而且对于通过场电离进行状态选择性检测也是有用的。在磁场中产生的大的偶极矩对于控制处于里德伯态的分子的运动也是有用的。这里回顾的应用包括：ZEKE（零动能），MATI（质量分析阈值电离）和PIRI（光诱导里德伯电离）光谱学;离子和电子的脉冲场复合;分子离子的状态选择和反应;里德伯态与中性粒子、离子和金属表面的碰撞;光解离产物的里德伯标记和成像;以及通过使用非均匀场来控制平移运动和定向。
Molecules in high Rydberg states, in which one electron has been excited into a hydrogenic orbital of large mean radius, have many unusual properties compared to ground state molecules. These properties, which are reviewed in this article, make them suitable for a diverse and growing number of applications in chemical dynamics. The most recent methods for studying molecular Rydberg states using high-resolution spectroscopy and theory, including effects of electric fields, are described here. An important feature is the high susceptibility of Rydberg states to external field perturbation which not only has a profound effect on the observable energy levels, spectroscopic intensities and lifetimes, but is also useful for state-selective detection through field ionization. The large dipole moment that can be created in a field is also useful for controlling the motion of molecules in Rydberg states. The applications reviewed here include: ZEKE (zero kinetic energy), MATI (mass-analyzed threshold ionization) and PIRI (photo-induced Rydberg ionization) spectroscopy; pulsed-field recombination of ions and electrons; the state selection and reaction of molecular ions; collisions of Rydberg states with neutrals, ions and metallic surfaces; Rydberg tagging and imaging of products of photodissociation; and the control of translational motion and orientation via the use of inhomogeneous fields.