[1] [1] Nisoli M, Decleva P, Calegari F, Palacios A, Martin F. Attosecond electron dynamics in molecules. Chem Rev. 2017;117(16):10760–10825.10.1021/acs.chemrev.6b00453

[2] [2] Chini M, Zhao K, Chang Z. The generation, characterization and applications of broadband isolated attosecond pulses. Nat Photonics. 2014;8:178–186.10.1038/nphoton.2013.362

[3] [3] Krausz F, Ivanov M. Attosecond physics. Rev Mod Phys. 2009;81:163–234.10.1103/RevModPhys.81.163

[4] [4] Hu SX, Collins LA. Attosecond pump probe: Exploring ultrafast electron motion inside an atom. Phys Rev Lett. 2006;96:073004.

[5] [5] He F, Ruiz C, Becker A. Control of electron excitation and localization in the dissociation of H2+ and its isotopes using two sequential ultrashort laser pulses. Phys Rev Lett. 2007;99(8):083002.

[6] [6] Sansone G, Kelkensberg F, Pérez-Torres JF, Morales F, Kling MF, Siu W, Ghafur O, Johnsson P, Swoboda M, Benedetti E, et al. Electron localization following attosecond molecular photoionization. Nature. 2010;465:763–766.10.1038/nature09084

[7] [7] Sheehy B, Martin JDD, DiMauro LF, Agostini P, Schafer KJ, Gaarde MB, Kulander KC. High harmonic generation at long wavelengths. Phys Rev Lett. 1999;83:5270.

[8] [8] Gaarde MB, Schafer KJ, Kulander KC, Sheehy B, Kim D, DiMauro LF. Strong species dependence of high order photoelectron production in alkali metal atoms. Phys Rev Lett. 2000;84:2822–2825.

[9] [9] Pellegrini C, Marinelli A, Reiche S. The physics of x-ray free-electron lasers. Rev Mod Phys. 2016;88:015006.

[10] [10] Seddon EA, Clarke JA, Dunning DJ, Masciovecchio C, Milne CJ, Parmigiani F, Rugg D, Spence JCH, Thompson NR, Ueda K, et al. Short-wavelength free-electron laser sources and science: A review*. Rep Prog Phys. 2017;80:115901.10.1088/1361-6633/aa7cca

[11] [11] Duris JP, Li S, Driver T, Champenois EG, MacArthur JP, Lutman AA, Zhang Z, Rosenberger P, Aldrich JW, Coffee R, et al. Tunable isolated attosecond x-ray pulses with gigawatt peak power from a free-electron laser. Nat Photonics. 2019;14:30–36.

[12] [12] Li S, Driver T, Rosenberger P, Champenois EG, Duris J, al-Haddad A, Averbukh V, Barnard JCT, Berrah N, Bostedt C, et al. Attosecond coherent electron motion in auger-meitner decay. Science. 2022;375:285–290.10.1126/science.abj2096

[13] [13] Pabst S, Santra R. Strong-field many-body physics and the giant enhancement in the high-harmonic spectrum of xenon. Phys Rev Lett. 2013;111:233005.

[14] [14] Faccialà D, Pabst S, Bruner BD, Ciriolo AG, de Silvestri S, Devetta M, Negro M, Soifer H, Stagira S, Dudovich N, et al. Probe of multielectron dynamics in xenon by caustics in high-order harmonic generation. Phys Rev Lett. 2016;117:093902.

[15] [15] LaForge AC, Son SK, Mishra D, Ilchen M, Duncanson S, Eronen E, Kukk E, Wirok-Stoletow S, Kolbasova D, Walter P, et al. Resonance-enhanced multiphoton ionization in the x-ray regime. Phys Rev Lett. 2021;127:213202.

[16] [16] Grobe R, Eberly JH. Observation of coherence transfer by electron-electron correlation. Phys Rev A. 1993;48:623–627.

[17] [17] Bartschat K, Bray I. Electron-impact ionization of atomic hydrogen from the 1s and 2s states. J Phys B Atomic Mol Phys. 1996;29:L577.

[18] [18] Bray I, Fursa DV, Kheifets AS, Stelbovics AT. Electrons and photons colliding with atoms: Development and application of the convergent close-coupling method. J Phys B Atomic Mol Phys. 2002;35:R117.

[19] [19] Colgan J, Pindzola MS, Robicheaux F. Lattice calculations of the photoionization of li. Phys Rev Lett. 2004;93:053201.

[20] [20] Kheifets AS, Fursa DV, Bray I, Colgan J, Pindzola MS. Differential cross sections of double photoionization of lithium. Phys Rev A. 2010;82:023403.

[21] [21] Colgan J, Emmanouilidou A, Pindzola MS. Evidence for a T-shape break-up pattern in the triple photoionization of li. Phys Rev Lett. 2013;110:063001.

[22] [22] Wehlitz R, Huang MT, DePaola BD, Levin JC, Sellin IA, Nagata T, Cooper JW, Azuma Y. Triple photoionization of lithium. Phys Rev Lett. 1998;81:1813–1816.

[23] [23] Huang M-T, Wehlitz R, Azuma Y, Pibida L, Sellin IA, Cooper JW, Koide M, Ishijima H, Nagata T. Single and double photoionization of lithium. Phys Rev A. 1999;59:3397–3401.

[24] [24] Zhu G, Schuricke M, Steinmann J, Albrecht J, Ullrich J, Ben-Itzhak I, Zouros TJM, Colgan J, Pindzola MS, Dorn A. Controlling two-electron threshold dynamics in double photoionization of lithium by initial-state preparation. Phys Rev Lett. 2009;103:103008.

[25] [25] Ruiz C, Plaja L, Roso L. Lithium ionization by a strong laser field. Phys Rev Lett. 2005;94:063002.

[26] [26] Rapp J, Bauer D. Effects of inner electrons on atomic strong-field-ionization dynamics. Phys Rev A. 2014;89:033401.

[27] [27] Thiede JH, Eckhardt B, Efimov DK, Prauzner-Bechcicki JS, Zakrzewski J. Ab initio study of time-dependent dynamics in strong-field triple ionization. Phys Rev A. 2018;98:031401.

[28] [28] Wehlitz R, Bluett JB, Whitfield SB. Comparison of the double- to single-photoionization ratio of li with he. Phys Rev A. 2002;66:012701.

[29] [29] Kheifets AS, Fursa DV, Bray I. Two-electron photoionization of ground-state lithium. Phys Rev A. 2009;80:063413.

[30] [30] Kheifets AS, Fursa DV, Hines CW, Bray I, Colgan J, Pindzola MS. Spin effects in double photoionization of lithium. Phys Rev A. 2010;81:023418.

[31] [31] Efimov DK, Prauzner-Bechcicki JS, Thiede JH, Eckhardt B, Zakrzewski J. Double ionization of a three-electron atom: Spin correlation effects. Phys Rev A. 2019;100:063408.

[32] [32] Barth I, Smirnova O. Comparison of theory and experiment for nonadiabatic tunneling in circularly polarized fields. Phys Rev A. 2013;87:065401.

[33] [33] Hartung A, Morales F, Kunitski M, Henrichs K, Laucke A, Richter M, Jahnke T, Kalinin A, Schöffler M, Schmidt LPH, et al. Electron spin polarization in strong-field ionization of xenon atoms. Nat Photonics. 2016;10:526–528.10.1038/nphoton.2016.109

[34] [34] Liu M-M, Shao Y, Han M, Ge P, Deng Y, Wu C, Gong Q, Liu Y. Energy- and momentum-resolved photoelectron spin polarization in multiphoton ionization of xe by circularly polarized fields. Phys Rev Lett. 2018;120:043201.

[35] [35] Trabert D, Hartung A, Eckart S, Trinter F, Kalinin A, Schöffler M, Schmidt LPH, Jahnke T, Kunitski M, Dörner R. Spin and angular momentum in strong-field ionization. Phys Rev Lett. 2018;120:043202.

[36] [36] Han M, Ge P, Liu M-M, Gong Q, Liu Y. Spatially and temporally controlling electron spin polarization in strong-field ionization using orthogonal two-color laser fields. Phys Rev A. 2019;99:023404.

[37] [37] Cherepkov N. Spin polarization of atomic and molecular photoelectrons. Adv At Mol Phys. 1983;19:395–447.

[38] [38] Javanainen J, Eberly JH, Su Q. Numerical simulations of multiphoton ionization and above-threshold electron spectra. Phys Rev A. 1988;38:3430–3446.

[39] [39] Kosloff R, Kosloff D. Absorbing boundaries for wave propagation problems. J Comput Phys. 1986;63:363–376.10.1016/0021-9991(86)90199-3

[40] [40] Crank J, Nicolson P. A practical method for numerical evaluation of solutions of partial differential equations of the heat-conduction type. Adv Comput Math. 1947;6:207–226.

[41] [41] Li Y, Sato T, Ishikawa KL. High-order harmonic generation enhanced by laser-induced electron recollision. Phys Rev A. 2019;99:043401.

[42] [42] Sainadh US, Xu H, Wang X, Atia-Tul-Noor A, Wallace WC, Douguet N, Bray A, Ivanov I, Bartschat K, Kheifets A, et al. Attosecond angular streaking and tunnelling time in atomic hydrogen. Nature. 2019;568:75–77.10.1038/s41586-019-1028-3

[43] [43] Pazourek R, Nagele S, Burgdörfer J. Probing time-ordering in two-photon double ionization of helium on the attosecond time scale. J Phys B Atomic Mol Phys. 2015;48:061002.

[44] [44] Baum G, Blask W, Freienstein P, Frost L, Hesse S, Raith W, Rappolt P, Streun M. Spin asymmetries for triple-differential electron-impact ionization of lithium at 54.4 ev. Phys Rev Lett. 1992;69:3037–3040.

[45] [45] Streun M, Baum G, Blask W, Berakdar J. Role of exchange and kinematic in the generation of low-energy polarized electron pairs. Phys Rev A. 1999;59:R4109–R4112.

[46] [46] Kang H-S, Ko IS. Attosecond xfel for pump-probe experiments. Nat Photonics. 2019;14:7–8.