文献类型：期刊文献

英文题名：Quantum interference and collisional dynamics in excited bounds states revealed by time-resolved pump-high-harmonic-generation-probe spectroscopy

作者：Dorfman, Konstantin E.[1,2];Wei, Pengfei[3];Liu, Jiayun[2];Li, Ruxin[4]

机构：[1]East China Normal Univ, State Key Lab Precis Spect, Shanghai 200062, Peoples R China;[2]Singapore Inst Mfg Technol, 71 Nanyang Dr, Singapore 638075, Singapore;[3]Shaoxing Univ, Dept Phys, Shaoxing 312000, Peoples R China;[4]Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, State Key Lab High Field Laser Phys, Shanghai 201800, Peoples R China

年份：2019

卷号：27

期号：5

起止页码：7147

外文期刊名：OPTICS EXPRESS

收录：SCI-EXPANDED(收录号：WOS:000460170000100)、、EI(收录号：20191106643810)、Scopus(收录号：2-s2.0-85062893097)、WOS

基金：Science and Engineering Research Council at the Singapore Agency for Science, Technology and Research X-ray Photonics Program (1426500053); Zijiang Endowed Young Scholar Fund, East China Normal University; Overseas Expertise Introduction Project for Discipline Innovation (111 Project, B12024).

语种：英文

外文关键词：Dynamics - Harmonic analysis - Harmonic generation - Ionization of gases - Laser pulses - Light sources - Probes - Pumps - Quantum interference devices

外文摘要：Ultrafast pump-high-harmonic-generation-probe spectroscopy aims to provide a unique observation window into electronic dynamics while using the infrared or visible light sources. While it is widely accepted that the role of excited bound states in high-harmonic generation is negligible, its dynamics play a significant role in time-resolved pump-probe measurements. Here we show that the time-resolved pump-high-harmonic-generation-probe measurement may reveal a significant (up to 20%) contribution of the quantum interference in electron ionization and recombination with atomic system, with the initial or the final state being an excited bound state. Interplay of two dephasing mechanisms of electron-ion and electron-atom collisions yields decay and recovery of the time-resolved signal, respectively, signifying the role of the quantum interference involving excited bound states in recovery mode. Our theory, based on the density matrix Liouville space formalism, is supported by experimental measurements in argon gas. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement