Rare Gases and Other Simple Systems at High Pressure

这个程序是针对测量电子激发态能量和传导带隙在压缩晶体，如固体氩和固体氢使用非线性光谱学。这些测量与深层行星大气问题以及与高度压缩氢中可能的绝缘体-金属转变有关的持续问题有关。需要使用非线性光学方法来激发所涉及的深紫外态，同时使用可通过压力室窗口传输的光束进行探测。固体氢和固体氩等晶体的性质对于理解各种系统中的现象至关重要，比如木星的深层大气，或者当压缩到极高压力时，材料从绝缘到导电的变化。这种理解的基础是了解电子在非常压力下的行为。该项目采用创新的方法，使用高功率激光脉冲来测量包括固体氢和氩在内的压缩简单系统中的电子能量。＊＊＊

9510333 Daniels This program is directed toward measurement of electronic excited state energies and conduction band gaps in compressed cryocrystals such as solid argon and solid hydrogen using nonlinear optical spectroscopy. These measurements are relevant to deep planetary atmospheres problems and to ongoing questions related to a possible insulator-metal transition in highly compressed hydrogen. The nonlinear optics methods used are required to excite the deep ultraviolet states involved, while probing with optical beams transmittable by pressure cell windows. %%% Properties of crystals such as solid hydrogen and solid argon are crucial to understanding of phenomena in systems as diverse as the deep atmosphere of the planet Jupiter or the change of materials from electrically insulating to conducting when compressed to extremely high pressures. Fundamental to this understanding is a knowledge of how electrons behave at very pressures. This program is applying innovative methods using high-powered laser light pulses to measure electron energies in compressed simple systems including solid hydrogen and argon. ***