Extreme-ultraviolet pump–probe studies of one-femtosecond-scale electron dynamics P Tzallas, E Skantzakis, LAA Nikolopoulos, GD Tsakiris, D Charalambidis Nature Physics 7 (10), 781-784, 2011 | 257 | 2011 |

Multichannel theory of two-photon single and double ionization of helium LAA Nikolopoulos, P Lambropoulos Journal of Physics B: Atomic, Molecular and Optical Physics 34 (4), 545, 2001 | 169 | 2001 |

Time-dependent theory of double ionization of helium under XUV radiation LAA Nikolopoulos, P Lambropoulos Journal of Physics B: Atomic, Molecular and Optical Physics 40 (7), 1347, 2007 | 124 | 2007 |

Two-photon ionization of He through a superposition of higher harmonics NA Papadogiannis, LAA Nikolopoulos, D Charalambidis, GD Tsakiris, ... Physical review letters 90 (13), 133902, 2003 | 119 | 2003 |

The RMT method for many-electron atomic systems in intense short-pulse laser light LR Moore, MA Lysaght, LAA Nikolopoulos, JS Parker, HW Van Der Hart, ... Journal of Modern Optics 58 (13), 1132-1140, 2011 | 107 | 2011 |

Extracting continuum information from in time-dependent wave-packet calculations LB Madsen, LAA Nikolopoulos, TK Kjeldsen, J Fernández Physical Review A 76 (6), 063407, 2007 | 98 | 2007 |

Solving the -mixing problem for the three-dimensional time-dependent Schrödinger equation by rotations: Application to strong-field ionization of TK Kjeldsen, LAA Nikolopoulos, LB Madsen Physical Review A 75 (6), 063427, 2007 | 74 | 2007 |

Exploring intense attosecond pulses D Charalambidis, P Tzallas, EP Benis, E Skantzakis, G Maravelias, ... New Journal of Physics 10 (2), 025018, 2008 | 66 | 2008 |

Second order autocorrelation of an XUV attosecond pulse train LAA Nikolopoulos, EP Benis, P Tzallas, D Charalambidis, K Witte, ... Physical review letters 94 (11), 113905, 2005 | 64 | 2005 |

Combined R-matrix eigenstate basis set and finite-difference propagation method for the time-dependent Schrödinger equation: The one-electron case LAA Nikolopoulos, JS Parker, KT Taylor Physical Review A 78 (6), 063420, 2008 | 60 | 2008 |

Signatures of direct double ionization under xuv radiation P Lambropoulos, LAA Nikolopoulos, MG Makris Physical Review A 72 (1), 013410, 2005 | 49 | 2005 |

Quantum Dynamic Imaging: Theoretical and Numerical Methods AD Bandrauk, M Ivanov Springer Science & Business Media, 2011 | 41 | 2011 |

Use of helium double ionization for autocorrelation of an xuv pulse T Nakajima, LAA Nikolopoulos Physical Review A 66 (4), 041402, 2002 | 41 | 2002 |

Direct versus sequential double ionization in atomic systems P Lambropoulos, LAA Nikolopoulos, MG Makris, A Mihelič Physical Review A 78 (5), 055402, 2008 | 40 | 2008 |

Extracting generalized multiphoton ionization cross-sections from nonperturbative time-dependent calculations: An application in positronium LB Madsen, LAA Nikolopoulos, P Lambropoulos The European Physical Journal D-Atomic, Molecular, Optical and Plasma …, 2000 | 37 | 2000 |

Theory of ac Stark splitting in core-resonant Auger decay in strong x-ray fields LAA Nikolopoulos, TJ Kelly, JT Costello Physical Review A 84 (6), 063419, 2011 | 35 | 2011 |

Above-threshold ionization of negative hydrogen LAA Nikolopoulos, P Lambropoulos Physical Review A 56 (4), 3106, 1997 | 35 | 1997 |

Time-dependent nonperturbative theory of H− in a strong laser field LAA Nikolopoulos, P Lambropoulos Physical review letters 82 (19), 3771, 1999 | 32 | 1999 |

Three-dimensional time-dependent Hartree-Fock approach for arbitrarily oriented molecular hydrogen in strong electromagnetic fields LAA Nikolopoulos, TK Kjeldsen, LB Madsen Physical Review A 76 (3), 033402, 2007 | 30 | 2007 |

A package for the ab-initio calculation of one-and two-photon cross sections of two-electron atoms, using a CI B-splines method LAA Nikolopoulos Computer physics communications 150 (2), 140-165, 2003 | 30 | 2003 |