Scaling of the Low-Energy Structure in Above-Threshold Ionization in the Tunneling Regime: Theory and Experiment

被引：88

作者：

Guo, L. ^{[1
,2
]}

Han, S. S. ^{[1
,2
]}

Liu, X. ^{[3
]}

Cheng, Y. ^{[4
]}

Xu, Z. Z. ^{[4
]}

Fan, J. ^{[5
]}

Chen, J. ^{[6
,7
]}

Chen, S. G. ^{[7
]}

Becker, W. ^{[8
]}

Blaga, C. I. ^{[9
]}

DiChiara, A. D. ^{[9
]}

Sistrunk, E. ^{[9
]}

Agostini, P. ^{[9
]}

DiMauro, L. F. ^{[9
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, Key Lab Quantum Opt, Shanghai 201800, Peoples R China

[2] Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, Ctr Cold Atom Phys, Shanghai 201800, Peoples R China

[3] Chinese Acad Sci, Wuhan Inst Phys & Math, State Key Lab Magnet Resonance & Atom & Mol Phys, Wuhan 430071, Peoples R China

[4] Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, State Key Lab High Field Laser Phys, Shanghai 201800, Peoples R China

[5] Univ Maryland, Joint Quantum Inst, College Pk, MD 20742 USA

[6] Peking Univ, Ctr Appl Phys & Technol, HEDPS, Beijing 100084, Peoples R China

[7] Inst Appl Phys & Computat Math, Beijing 100088, Peoples R China

[8] Max Born Inst, D-12489 Berlin, Germany

[9] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 01期

基金：

美国国家科学基金会;

关键词：

MULTIPHOTON IONIZATION; FIELD IONIZATION; ATOMS; PLATEAU; SPECTRA; XENON; LIMIT;

D O I：

10.1103/PhysRevLett.110.013001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A calculation of the second-order (rescattering) term in the S-matrix expansion of above-threshold ionization is presented for the case when the binding potential is the unscreened Coulomb potential. Technical problems related to the divergence of the Coulomb scattering amplitude are avoided in the theory by considering the depletion of the atomic ground state due to the applied laser field, which is well defined and does not require the introduction of a screening constant. We focus on the low-energy structure, which was observed in recent experiments with a midinfrared wavelength laser field. Both the spectra and, in particular, the observed scaling versus the Keldysh parameter and the ponderomotive energy are reproduced. The theory provides evidence that the origin of the structure lies in the long-range Coulomb interaction. DOI: 10.1103/PhysRevLett.110.013001

引用

页数：5

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