[1] Hurst G S, Payne M G, Kramer S D et al. Resonance ionization spectroscopy and one-atom detection[J]. Reviews of Modern Physics, 51, 767-819(1979). http://adsabs.harvard.edu/abs/1979RvMP...51..767H

[2] Javanainen J, Eberly J H, Su Q C. Numerical simulations of multiphoton ionization and above-threshold electron spectra[J]. Physical Review A, 38, 3430-3446(1988). http://europepmc.org/abstract/MED/9900778

[3] Tong X M, Zhao Z X, Lin C D. Theory of molecular tunneling ionization[J]. Physical Review A, 66, 033402(2002). http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=VIRT05000001000005000029000001&idtype=cvips&gifs=Yes

[4] Huang K Y, Xia Q Z, Fu L B. Survival window for atomic tunneling ionization with elliptically polarized laser fields[J]. Physical Review A, 87, 033415(2013). http://adsabs.harvard.edu/abs/2013PhRvA..87c3415H

[5] Pedatzur O, Orenstein G, Serbinenko V et al. Attosecond tunnelling interferometry[J]. Nature Physics, 11, 815-820(2015).

[6] Keldysh L V. Ionization in the field of a strong electromagnetic wave[J]. Soviet Physics JETP, 20, 1307-1314(1965).

[7] Zheng X X, Bai L H, Feng F Z. Non-sequential double ionization of magnesium atom in elliptically polarized strong laser field[J]. Laser & Optoelectronics Progress, 54, 080201(2017). http://en.cnki.com.cn/Article_en/CJFDTotal-JGDJ201708007.htm

[8] Feng F Z, Bai L H, Zheng X X. Non-sequential double ionization of Mg atoms below threshold laser power density[J]. Acta Optica Sinica, 38, 0702003(2018).

[9] Carlson T A. Nestor C W Jr. Calculation of electron shake-off probabilities as the result of X-ray photoionization of the rare gases[J]. Physical Review A, 8, 2887-2894(1973). http://adsabs.harvard.edu/abs/1973PhRvA...8.2887C

[10] Jiang W C, Shan J Y, Gong Q H et al. Virtual sequential picture for nonsequential two-photon double ionization of helium[J]. Physical Review Letters, 115, 153002(2015). http://europepmc.org/abstract/MED/26550720

[11] Lambropoulos P. Mechanisms for multiple ionization of atoms by strong pulsed lasers[J]. Physical Review Letters, 55, 2141-2144(1985). http://www.ncbi.nlm.nih.gov/pubmed/10032059

[12] Becker W, Liu X J, Ho P J et al. Theories of photoelectron correlation in laser-driven multiple atomic ionization[J]. Reviews of Modern Physics, 84, 1011-1043(2012). http://adsabs.harvard.edu/abs/2012rvmp...84.1011b

[13] Corkum P B. Recollision physics[J]. Physics Today, 64, 36-41(2011).

[14] Corkum P B. Plasma perspective on strong field multiphoton ionization[J]. Physical Review Letters, 71, 1994-1997(1993). http://europepmc.org/abstract/MED/10054556

[15] Zhang W B, Li H, Gong X C et al. Tracking the electron recapture in dissociative frustrated double ionization of D2[J]. Physical Review A, 98, 013419(2018). http://www.onacademic.com/detail/journal_1000040457361410_eb90.html

[16] Zhang W B, Gong X C, Li H et al. Electron-nuclear correlated multiphoton-route to Rydberg fragments of molecules[J]. Nature Communications, 10, 757(2019).

[17] Kopold R, Becker W, Rottke H et al. Routes to nonsequential double ionization[J]. Physical Review Letters, 85, 3781-3784(2000). http://www.ncbi.nlm.nih.gov/pubmed/11041926

[18] Lein M. Gross E K U, Engel V. Intense-field double ionization of helium: identifying the mechanism[J]. Physical Review Letters, 85, 4707-4710(2000).

[19] Weber T, Giessen H, Weckenbrock M et al. Correlated electron emission in multiphoton double ionization[J]. Nature, 405, 658-661(2000). http://www.ncbi.nlm.nih.gov/pubmed/10864317

[20] Liu Y Q, Tschuch S, Rudenko A et al. Strong-field double ionization of Ar below the recollision threshold[J]. Physical Review Letters, 101, 053001(2008). http://europepmc.org/abstract/MED/18764387

[21] Liu Y Q, Ye D F, Liu J et al. Multiphoton double ionization of Ar and Ne close to threshold[J]. Physical Review Letters, 104, 173002(2010). http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=VIRT05000009000005000068000001&idtype=cvips&gifs=Yes

[22] Liu Y Q, Fu L B, Ye D F et al. Strong-field double ionization through sequential release from double excitation with subsequent Coulomb scattering[J]. Physical Review Letters, 112, 013003(2014). http://europepmc.org/abstract/med/24483894

[23] Haan L, Smith S, Shomsky N et al. Anticorrelated electrons from weak recollisions in nonsequential double ionization[J]. Journal of Physics B: Atomic, Molecular and Optical Physics, 41, 211002(2008). http://www.ingentaconnect.com/content/iop/jphysb/2008/00000041/00000021/art211002

[24] Ye D F, Liu J. Strong-field double ionization at the transition to below the recollision threshold[J]. Physical Review A, 81, 043402(2010). http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=VIRT05000009000005000062000001&idtype=cvips&gifs=Yes

[25] Shaaran T, Nygren M T. Figueira de Morisson Faria C. Laser-induced nonsequential double ionization at and above the recollision-excitation-tunneling threshold[J]. Physical Review A, 81, 063413(2010).

[26] Zhang Z L, Bai L H, Zhang J T. Double ionization of Ar below the recollision threshold intensity[J]. Physical Review A, 90, 023410(2014). http://journals.aps.org/pra/accepted/76070Nd9Gb61a21841b90dc62b02156d387a2612a

[27] Ye D F, Li M, Fu L B et al. Scaling laws of the two-electron sum-energy spectrum in strong-field double ionization[J]. Physical Review Letters, 115, 123001(2015). http://www.ncbi.nlm.nih.gov/pubmed/26430991

[28] Maxwell A. Controlling below-threshold nonsequential double ionization via quantum interference[J]. Physical Review Letters, 116, 143001(2016). http://www.ncbi.nlm.nih.gov/pubmed/27104701

[29] Zhao J, Lein M. Probing Fano resonances with ultrashort pulses[J]. New Journal of Physics, 14, 065003(2012). http://www.ingentaconnect.com/content/iop/njp/2012/00000014/00000006/art065003

[30] Li Z C, He F. Ab initio non-Born-Oppenheimer simulations of rescattering dissociation of H2 in strong infrared laser fields[J]. Physical Review A, 90, 053423(2014). http://adsabs.harvard.edu/abs/2014phrva..90e3423l

[31] Xie X H. Two-dimensional attosecond electron wave-packet interferometry[J]. Physical Review Letters, 114, 173003(2015). http://europepmc.org/abstract/MED/25978229

[32] Wu W Y, He F. Asymmetric photoelectron momentum distribution driven by two-color XUV fields[J]. Physical Review A, 93, 023415(2016). http://adsabs.harvard.edu/abs/2016PhRvA..93b3415W

[33] Li Z C, Jaron-Becker A, He F. Superelastic rescattering in single ionization of helium in strong laser fields[J]. Physical Review A, 94, 043406(2016). http://journals.aps.org/pra/abstract/10.1103/PhysRevA.94.043406

[34] Lein M. Gross E K U, Engel V. Discrete peaks in above-threshold double-ionization spectra[J]. Physical Review A, 64, 023406(2001).

[35] Lappas D G, van Leeuwen R. Electron correlation effects in the double ionization of He[J]. Journal of Physics B: Atomic, Molecular and Optical Physics, 31, L249-L256(1998). http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998JPhB...31L.249L&db_key=PHY&link_type=EJOURNAL

[36] Tong X M, Hino K, Toshima N. Phase-dependent atomic ionization in few-cycle intense laser fields[J]. Physical Review A, 74, 031405(2006). http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=VIRT05000005000010000074000001&idtype=cvips&gifs=Yes

[37] Tong X M, Watahiki S, Hino K et al. Numerical observation of the rescattering wave packet in laser-atom interactions[J]. Physical Review Letters, 99, 093001(2007). http://europepmc.org/abstract/med/17931003

[38] He P L, Takemoto N, He F. Photoelectron momentum distributions of atomic and molecular systems in strong circularly or elliptically polarized laser fields[J]. Physical Review A, 91, 063413(2015). http://adsabs.harvard.edu/abs/2015PhRvA..91f3413H

[39] Kosloff R, Kosloff D. Absorbing boundaries for wave propagation problems[J]. Journal of Computational Physics, 63, 363-376(1986). http://adsabs.harvard.edu/cgi-bin/nph-data_query?link_type=ABSTRACT&bibcode=1986JCoPh..63..363K

[40] Press W H, Teukolsky S A, Vetterling W T et al. Numerical recipes[M]. Cambridge: Cambridge University Press(1992).

[41] Parker J S. Doherty B J S, Taylor K T, et al. High-energy cutoff in the spectrum of strong-field nonsequential double ionization[J]. Physical Review Letters, 96, 133001(2006).

[42] Armstrong J, Parker S, Taylor T. Double-electron above-threshold ionization resonances as interference phenomena[J]. New Journal of Physics, 13, 013024(2011). http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011NJPh...13a3024A&db_key=PHY&link_type=ABSTRACT

[43] Henrichs K, Waitz M, Trinter F et al. Observation of electron energy discretization in strong field double ionization[J]. Physical Review Letters, 111, 113003(2013). http://europepmc.org/abstract/MED/24074083

[44] Gong X C, Song Q Y, Ji Q Y et al. Channel-resolved above-threshold double ionization of acetylene[J]. Physical Review Letters, 114, 163001(2015). http://www.ncbi.nlm.nih.gov/pubmed/25955049