O437 2001021031光折变Fe;LiNbO<sub>3</sub>晶体中质子与热激发电子之间的竞争=Competition between the protons and thethermally excited electrons in photorefractiveFe:LiNbO<sub>3</sub> crystals[刊,...O437 2001021031光折变Fe;LiNbO<sub>3</sub>晶体中质子与热激发电子之间的竞争=Competition between the protons and thethermally excited electrons in photorefractiveFe:LiNbO<sub>3</sub> crystals[刊,中]/张国权,张万林,孙骞,许京军,张心正,刘思敏,张光寅（南开大学物理科学学院光子学中心.天津（300071））//光学学报.—2000,20（5）.—597-601研究了Fe:LiNbO<sub>3</sub>晶体的光折变性能随晶体温度变化的动态性质。结果显示,质子与热激发电子之间存在着强烈的竞争,在较低的温度下,在晶体光折变响应时间内,质子对晶体的光折变性能的影响很小,而在较高温度时,质子由于迁移率的增大而显著地影响晶体的光折变性能。图5参10（严寒）展开更多
A surface femtosecond two-photon photoemission （2PPE） spectrometer devoted to the study of ultrafast excited electron dynamics and photochemical kinetics on metal and metal oxide surfaces has been constructed. Low e...A surface femtosecond two-photon photoemission （2PPE） spectrometer devoted to the study of ultrafast excited electron dynamics and photochemical kinetics on metal and metal oxide surfaces has been constructed. Low energy photoelectrons are measured using a hemispherical electron energy analyzer with an imaging detector that allows us to detect the energy and the angular distributions of the photoelectrons simultaneously. A Mach-Zehnder interferom- eter was built for the time-resolved 2PPE （TR-2PPE） measurement to study ultrafast surface excited electron dynamics, which was demonstrated on the Cu（111） surface. A scheme for measuring time-dependent 2PPE （TD-2PPE） spectra has also been developed for studies of surface photochemistry. This technique has been applied to a preliminary study on the photochemical kinetics on ethanol/TiO2（110）. We have also shown that the ultrafast dynamics of photoinduced surface excited resonances can be investigated in a reliable way by combining the TR-2PPE and TD-2PPE techniques.展开更多
基金financially supported by the National Natural Science Foundation of China (11293064 and 22001015)the Fundamental Research Funds for the Central Universities (2050205)。
文摘O437 2001021031光折变Fe;LiNbO<sub>3</sub>晶体中质子与热激发电子之间的竞争=Competition between the protons and thethermally excited electrons in photorefractiveFe:LiNbO<sub>3</sub> crystals[刊,中]/张国权,张万林,孙骞,许京军,张心正,刘思敏,张光寅（南开大学物理科学学院光子学中心.天津（300071））//光学学报.—2000,20（5）.—597-601研究了Fe:LiNbO<sub>3</sub>晶体的光折变性能随晶体温度变化的动态性质。结果显示,质子与热激发电子之间存在着强烈的竞争,在较低的温度下,在晶体光折变响应时间内,质子对晶体的光折变性能的影响很小,而在较高温度时,质子由于迁移率的增大而显著地影响晶体的光折变性能。图5参10（严寒）
基金We are thankful to the National Natural Science Foundation of China(22174110 and 22127803)the Industrial Support Plan of Gansu Provincial Department of Education(2021cyzc-01)the Special Fund Project for Guiding Local Scientific and Technological Development by the Central Government(2020-2060503-17).
文摘A surface femtosecond two-photon photoemission （2PPE） spectrometer devoted to the study of ultrafast excited electron dynamics and photochemical kinetics on metal and metal oxide surfaces has been constructed. Low energy photoelectrons are measured using a hemispherical electron energy analyzer with an imaging detector that allows us to detect the energy and the angular distributions of the photoelectrons simultaneously. A Mach-Zehnder interferom- eter was built for the time-resolved 2PPE （TR-2PPE） measurement to study ultrafast surface excited electron dynamics, which was demonstrated on the Cu（111） surface. A scheme for measuring time-dependent 2PPE （TD-2PPE） spectra has also been developed for studies of surface photochemistry. This technique has been applied to a preliminary study on the photochemical kinetics on ethanol/TiO2（110）. We have also shown that the ultrafast dynamics of photoinduced surface excited resonances can be investigated in a reliable way by combining the TR-2PPE and TD-2PPE techniques.
