文献类型：期刊文献

英文题名：Probing electron - atom collision dynamics in gas plasma by high-order harmonic spectroscopy

作者：Wei, Pengfei[1,2];Qin, Meiyan[3,4];Yuan, Xiaolong[2];Liu, Candong[2];Li, Ruxin[2,7,8,9];Zeng, Zhinan[2];Lu, Peixiang[3];Dorfman, Konstantin[5,6];Ye, Weiguo[1];Yao, Bo[1];Wang, Qi Jie[4];Li, Hao[6];Liu, Jiayun[6];Zhang, Ying[6];Jeong, Seok Yong[7,8,9];Yun, Gunsu S.[7,8,9];Kim, Dong Eon[7,8,9]

机构：[1]Shaoxing Univ, Dept Phys, Shaoxing 312000, Peoples R China;[2]Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, State Key Lab High Field Laser Phys, Shanghai 201800, Peoples R China;[3]Wuhan Inst Technol, Lab Opt Informat Technol, Wuhan 430205, Hubei, Peoples R China;[4]Nanyang Technol Univ, Sch Elect & Elect Engn, Nanyang Ave, Singapore 639798, Singapore;[5]East China Normal Univ, State Key Lab Precis Spect, Shanghai 200062, Peoples R China;[6]Singapore Inst Mfg Technol, Innovis 138634, Singapore;[7]POSTECH, Phys Dept, Pohang 37673, South Korea;[8]POSTECH, Ctr Attosecond Sci & Technol, Pohang 37673, South Korea;[9]Max Planck POSTECH KOREA Res Initiat, Pohang 37673, South Korea

年份：2018

卷号：43

期号：9

起止页码：1970

外文期刊名：OPTICS LETTERS

收录：SCI-EXPANDED(收录号：WOS:000431179400008)、、EI(收录号：20181905178589)、Scopus(收录号：2-s2.0-85046671513)、WOS

基金：National Natural Science Foundation of China (NSFC) (11474223, 11127901, 11227902, 11234004, 11404356, 11604248, 11774363, 61504082, 61521093, 61690223); ASTAR SERC Grant (1426500049, 1426500050); Global Research Laboratory Program (200900439); Max Planck POSTECH/KOREA Research Initiative Program (2016K1A4A4A01922028); Overseas Expertise Introduction Project for Discipline Innovation (111 Project, B12024).

语种：英文

外文关键词：Atom lasers - Dynamics - Impact ionization - Ionization of gases - Time delay

外文摘要：Plasma is a complex system involving diverse collisional processes and interactions, such as electron-impact excitation, ionization, recombination, etc. One of the most important methods for studying the properties and dynamics of plasma is to analyze the radiations from plasma. Here, we demonstrate the high-order harmonic (HH) spectroscopy for probing the complex electron - atomcollision (EAC) dynamics in a laser-induced gas plasma. These measurements were carried out by using an elliptically polarized pump and a time-delayed linearly polarized probe. The HH spectra from argon and krypton plasmas were recorded by scanning the time delay up to hundreds of picoseconds. We found that the delay-dependent HH yield contains three distinct regions, i.e., the first enhancement, the subsequent suppression, and the final restoration regions. A qualitative analysis shows that these features are clear signatures of the EAC processes and interactions involved in the delay-dependent HH spectroscopy. (C) 2018 Optical Society of America