Study of Photoplastic Effect on Ice

该项目由凝聚态物理和极地冰川学项目共同资助。该项目将研究冰的光塑性效应（PPE）的特征和物理机制：纯冰和掺杂冰在紫外线照射下表现出显著和持续的硬化。冰中PPE的基本机制尚不清楚，从基本的固体物理观点以及地球物理和环境观点来看，这是非常重要的。将进行实验室和现场实验。重点将放在微观过程，研究内摩擦，位错电流，电导率和光电导率，蚀刻和复制在冰表面出现的位错，光化学产物在照明下积累冰的光谱研究。该项目还包括一个适度的理论组成部分。研究结果旨在确定冰中PPE的基本机制，以及太阳紫外线照射对天然冰雪塑性性能的形成是否至关重要。该项目由凝聚态物理和极地冰川学项目共同资助。该项目将研究冰的光塑性效应（PPE）的特征和物理机制：纯冰和掺杂冰在紫外线照射下表现出显著和持续的硬化。冰中ppe的基本机制尚不清楚，从基本的固体物理观点以及地球物理和环境观点来看，这是非常重要的。将进行实验室和实地试验。该项目还包括一个适度的理论组成部分。研究结果旨在确定冰中PPE的基本机制，以及太阳紫外线照射对天然冰雪塑性性能的形成是否至关重要。＊＊＊

9413362 Petrenko This project is co-funded between the Condensed Matter Physics and Polar Glaciology Programs. The project will investigate the characteristics and physical mechanisms of the photoplastic effect (PPE) in ice: pure and doped ice demonstrate significant and persistent hardening under the action of ultraviolet illumination. The fundamental mechanism of PPE in ice is not understood, and is of importance from a fundamental solid state physics standpoint as well as geophysical and environmental viewpoints. Both laboratory and field experiments will be conducted. Emphasis will be placed in microscopic processes which are studied by internal friction, dislocation currents, conductivity and photoconductivity, etching and replicating of dislocations emerging on the surface of the ice, and spectroscopic study of photochemical products accumulating ice under illumination. The project also includes a modest theory component. The results are intended to determine the fundamental mechanism of the PPE in ice, and whether or not ultraviolet solar irradiation is essential in forming plastic properties of natural ice and snow. % % % This project is co-funded between the Condensed Matter Physics and Polar Glaciology Programs. The project will investigate the characteristics and physical mechanisms of the photoplastic effect (PPE) in ice: pure and doped ice demonstrate significant and persistent hardening under the action of ultraviolet illumination. The fundamental mechanism of ppe in ice is not understood, and is of importance from a fundamental solid state physics standpoint as well as geophysical and environmental viewpoints. Both laboratory and field experiments will conducted. The project also includes a modest theory component. The results are intended to determine the fundamental mechanism of the PPE in ice, and whether or not ultraviolet solar irradiation is essential in forming plastic properties of natural ice and snow. ***