Understanding two-photon double ionization of helium from the perspective of the characteristic time of dynamic transitions

doi:10.1088/1361-6455/ab390a

	Understanding two-photon double ionization of helium from the perspective of the characteristic time of dynamic transitions
	Li, Fei 7,8; Jin, Facheng 1,7; Yang, Yujun 2; Chen, Jing 3,4; Yan, Zong-Chao 5,6; Liu, Xiaojun 6; Wang, Bingbing 7,8
刊名	JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
	2019-10-14
卷号	52 期号:19 页码:11
关键词	double ionization ultrashort laser pulse uncertainty relation electron-electron interaction energy
ISSN号	0953-4075
DOI	10.1088/1361-6455/ab390a
英文摘要	By using the B-spline numerical method, we investigate a two-photon double-ionization (TPDI) process of helium in a high-frequency laser field with its carrier frequency ranging from 1.6 to 3.0. a.u. and the pulse duration ranging from 75 to 160. attoseconds. We found that there exists a characteristic time t(c) for a TPDI process, such that the pattern of energy distribution of two ionized electrons presents a peak or two, depending respectively on whether the pulse duration is shorter or longer than t(c). Especially, when the pulse duration is larger than t(c), the TPDI spectrum shows a double-peak structure which is attributed to the fact that most of the electron-electron Coulomb interaction energy is acquired by a single electron during their oscillation around the nucleus before the two electrons leave, and hence the double-peak structure cannot be identified as a signal of sequential ionization. Additionally, if the carrier frequency is less than the ionization energy of He+, i.e. that carrier frequency is in the so called correlated region, t(c) is not a fixed value, and it increases as the carrier frequency decreases; while if the carrier frequency is greater than the ionization energy of He+, i.e. the carrier frequency is in the so called non-correlated region, t(c) is fixed at about 105 attoseconds. We further found that, for a helium-like ion in its ground state, the characteristic time for when the carrier frequency is larger than the ionization energy of the second electron has a key relation with the Coulomb interaction energy (V) over bar (12) between the two electrons, which can be expressed as t(c) (V) over bar (12) = 4.192, a type of quantum mechanical uncertainty relation between time and energy. In addition, this relation can be attributed to the existence of a minimal evolution time from the ground state to a double ionization state with two electrons carrying different energies. These results may shed light on a deeper understanding of many-electron quantum dynamical processes.
资助项目	National Natural Science Foundation of China[11425414] ; National Natural Science Foundation of China[11474348] ; National Natural Science Foundation of China[11774129] ; National Natural Science Foundation of China[11774411] ; National Key Research and Development Program[2016YFA0401100] ; NSERC of Canada ; CAS/SAFEA International Partnership Program for Creative Research Teams
WOS关键词	FREE-ELECTRON LASER ; COHERENT
WOS研究方向	Optics ; Physics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000485697100001
资助机构	National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program ; National Key Research and Development Program ; NSERC of Canada ; NSERC of Canada ; CAS/SAFEA International Partnership Program for Creative Research Teams ; CAS/SAFEA International Partnership Program for Creative Research Teams ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program ; National Key Research and Development Program ; NSERC of Canada ; NSERC of Canada ; CAS/SAFEA International Partnership Program for Creative Research Teams ; CAS/SAFEA International Partnership Program for Creative Research Teams ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program ; National Key Research and Development Program ; NSERC of Canada ; NSERC of Canada ; CAS/SAFEA International Partnership Program for Creative Research Teams ; CAS/SAFEA International Partnership Program for Creative Research Teams ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program ; National Key Research and Development Program ; NSERC of Canada ; NSERC of Canada ; CAS/SAFEA International Partnership Program for Creative Research Teams ; CAS/SAFEA International Partnership Program for Creative Research Teams
内容类型	期刊论文
源URL	[http://ir.wipm.ac.cn/handle/112942/14963]
专题	中国科学院武汉物理与数学研究所
通讯作者	Wang, Bingbing
作者单位	1.Xian Aeronaut Univ, Fac Sci, Xian 710077, Shaanxi, Peoples R China 2.Jilin Univ, Inst Atom & Mol Phys, Changchun 130012, Jilin, Peoples R China 3.Inst Appl Phys & Computat Math, POB 8009, Beijing 100088, Peoples R China 4.Shantou Univ, Coll Sci, Dept Phys, Shantou 515063, Guangdong, Peoples R China 5.Univ New Brunswick, Dept Phys, Fredericton, NB E3B 5A3, Canada 6.Chinese Acad Sci, Wuhan Inst Phys & Math, State Key Lab Magnet Resonance & Atom & Mol Phys, Wuhan 430071, Hubei, Peoples R China 7.Chinese Acad Sci, Inst Phys, Lab Opt Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China 8.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Li, Fei,Jin, Facheng,Yang, Yujun,et al. Understanding two-photon double ionization of helium from the perspective of the characteristic time of dynamic transitions[J]. JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS,2019,52(19):11.
APA	Li, Fei.,Jin, Facheng.,Yang, Yujun.,Chen, Jing.,Yan, Zong-Chao.,...&Wang, Bingbing.(2019).Understanding two-photon double ionization of helium from the perspective of the characteristic time of dynamic transitions.JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS,52(19),11.
MLA	Li, Fei,et al."Understanding two-photon double ionization of helium from the perspective of the characteristic time of dynamic transitions".JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS 52.19(2019):11.