Photopumped VUV Laser at 60nm and Its Potential Application for Material Science Research

9402547抽吸器本项目的目标是开发一种输出激光波长接近60 nm的真空紫外激光器。 由于其光子能量（~ 20 eV）与分子键能相匹配，并且是光电子能谱中使用的典型能量值，因此这种类型的源在化学研究中将有几个非常重要的应用。 最终，我们设想开发一种实用的实验室规模的仪器，其输出功率在~60 nm的波长，超过任何现有的源，包括同步加速器。 我们的原型将用于与G. Scoles和他在化学系的小组进行了（a）高稀释度下的高分辨率光电子能谱和（B）质谱和飞行时间分子束实验。 这种激光器也可能成为材料科学研究的重要设备，特别是在半导体中光电子效应的研究和一般的固态物理学中。 正如其他激光发展的情况一样，成功可能会导致许多意想不到的应用，也许会开辟物理和化学的新领域。 我们在MoVII中发展VUV激光器的建议使用Feldman和Reader的泵浦方案。该方案是基于他们对同一元素的两种不同离子的独特线重合的观察，即在13.65 nm处的MoII线与MoVII线重合。 两条线都与基态强耦合。 这使得它们成为一个合适的一对被利用的粒子集总方案，即用于在MoVII中的4p 56 s-4p 55 p跃迁上在60 nm附近的波长处产生粒子数反转和增益。 ***

9402547 Suckewer The goal of this project is to develop a VUV laser with an output lasing wavelength near 60 nm. Because its photon energy (~20eV) matches molecular bonding energies and is typical of the energy values used in photoelectron spectroscopy, there will be several very important applications for a source of this type in chemical research. Ultimately we envision the development of a practical laboratory-size instrument with output power at a wavelength of ~60 nm which exceeds any present source,including synchrotrons. Our prototypes will be used in experiments conducted in collaboration with Prof. G. Scoles and his group in the Chemistry Department for (a) high resolution photoelectron spectroscopy at high dilution and (b) mass spectroscopy and time-of-flight molecular beam experiments. This laser may also become an important device for material science research particularly in the study of photoelectron effects in semiconductors and for solid state physics in general. As has been the case with other laser developments, success may lead to many unexpected applications perhaps opening up new areas of physics and chemistry. Our proposal for the development of VUV laser in MoVII uses the photopumping scheme of Feldman and Reader. The scheme is based on their observation of a unique line coincidence for two different ions of the same element, namely the MoII line at 13.65 nm which coincides with a MoVII line. Both line are strongly coupled to the ground state. This makes them a suitable pair to be exploited for the photopumping scheme i.e. for the creation of a population inversion and gain on the 4p56s-4p55p transitions in MoVII at a wavelength near 60nm. ***