MRI-R2: Development of a Time Resolved Ultraviolet Spectroscopies Laboratory

技术摘要：该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。PIs被授予一个主要研究仪器（MRI）项目，在科罗拉多大学开发一个新的时间分辨紫外光谱实验室。该系统的核心将是一个再生放大的钛蓝宝石系统，该系统将能够通过HHG（高谐波产生）过程产生超快的深紫外辐射，以及通过可见光和中红外产生可调谐的超快辐射。这种超快辐射将主要用于两种独特的光谱探针，我们也将在这个项目下开发紫外泵浦-探针角度分辨光发射光谱（ARPES）和紫外泵浦-探针拉曼光谱。该项目的总体目标将是确定固体各种激发态的动力学，以便了解弛豫过程的细节及其起源（电子-电子，电子-声子等）。这将通过从电子（泵-探针ARPES）和晶格（泵-探针拉曼）的角度观察这些过程来完成。总的来说，这是一个非常丰富和完全开放的研究领域，应用于研究许多最重要的材料系统和一些最深刻的潜在物理问题。这些包括相关的电子系统，包括高温超导，电致变色氧化物，热电材料等。另一类需要研究的重要材料是先进的光转换系统，包括有机光伏电池、染料敏化太阳能电池和半导体纳米晶体。来自校园和附近国家实验室（NREL和NIST）的大量合作者已经表达了对使用该设施的兴趣，预计未来还会有更多的合作者。概要：本奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。PIs被授予一个主要研究仪器（MRI）项目，在科罗拉多大学开发一个新的时间分辨紫外光谱实验室。该系统的核心将是一个高功率激光系统，它将产生极短的光脉冲，波长范围从紫外线到红外线。这种激光将主要用于以时间分辨的方式探测和理解材料物理，告诉我们电子如何在固体中移动和相互作用。总的来说，这是一个非常丰富和完全开放的研究领域，应用于研究许多最重要的材料系统和一些最深刻的潜在物理问题。要研究的材料包括高温超导体、有机光伏、染料敏化太阳能电池、半导体纳米晶体和电致变色氧化物（一种可以在施加电压时改变颜色的材料，可用于“智能”窗户）。来自校园和附近国家实验室（NREL和NIST）的大量合作者已经表达了对使用该设施的兴趣，预计未来还会有更多的合作者。

Technical Summary: This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).The PIs are awarded a Major Research Instrumentation (MRI) program to develop a new time-resolved ultraviolet spectroscopy laboratory at the University of Colorado. The heart of the system will be a regeneratively amplified Titanium-sapphire system which will enable creation of ultrafast deep-ultraviolet radiation through the HHG (high harmonic generation) process, as well as the creation of tunable ultrafast radiation through the visible and the mid-infrared. This ultrafast radiation will principally be utilized for two unique spectroscopic probes which we will also develop under this program - ultraviolet pump-probe angle-resolved photoemission spectroscopy (ARPES) and ultraviolet pump-probe Raman spectroscopy. The general goal of the project will be to determine the dynamics of various excited states of a solid so as to understand the details of the relaxation processes and their origins (electron-electron, electron-phonon, etc.). This will be done by observing these processes from both the electron (pump-probe ARPES) and lattice (pump-probe Raman) points of view. This is in general an extremely rich and completely wide open area of study with applications to the study of many of the most important materials systems with some of the deepest underlying physics questions. These include correlated electron systems including high temperature superconductivity, electrochromic oxides, thermoelectric materials, etc. Another important class of materials to be studied is advanced photoconversion systems including organic photovoltaics, dye-sensitized solar cells, and semiconducting nanocrystals. A wide body of collaborators from across campus and nearby national laboratories (NREL and NIST) have expressed interest in using this facility, and many others are expected in the future. Layman Summary: This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).The PIs are awarded a Major Research Instrumentation (MRI) program to develop a new time-resolved ultraviolet spectroscopy laboratory at the University of Colorado. The heart of the system will be a high power laser system which will create extremely short pulses of light with a wide range of wavelengths from the ultraviolet to the infrared. This laser light will principally be utilized to probe and understand materials physics in a time-resolved manner, telling us how the electrons move and interact with each other within a solid. This is in general an extremely rich and completely wide open area of study with applications to the study of many of the most important materials systems with some of the deepest underlying physics questions. Materials to be studied include high temperature superconductors, organic photovoltaics, dye-sensitized solar cells, semiconducting nanocrystals, and electrochromic oxides (materials which change color upon the application of a voltage, which could be used for "smart" windows. A wide body of collaborators from across campus and nearby national laboratories (NREL and NIST) have expressed interest in using this facility, and many others are expected in the future.