Watching the emergence of a Fano resonance in doubly excited helium

Attosecond-Resolved Electron Dynamics in Many-Electron Atoms: Quantitative Theory and Comparison with Measurements

“…The main purpose is to point out that the experimental findings on helium [7,8] and neon [10,11] are in agreement with our theoretical results of 2007 [16] and 2010 [11] (see also the conclusion of [17]). Complete information can be found in the original publications [7,8,10,11,16], including the supporting online material of [11]. The same themes were also briefly reviewed in [3], which is based on an invited talk at the 2015 Sanibel conference.…”

“…These measurements and the corresponding implications are directly related to, and in harmony with, our proposals and theoretical results that were produced in the '00s, based on time-dependent formalisms that allow the practical use of many-electron wavefunctions [1][2][3][4][5][6][11][12][13][14][15][16][17]. In the following paragraphs, I recall how these compare with the results and discussions in [7][8][9][10][11].…”

“…The predictions for Al have not yet been tested experimentally. However, those for helium were indeed subjected to a novel pump-probe experiment with a time delay of sub-femtosecond precision [7,8]. The findings and analysis of [7,8] confirmed the theory of [16], although the experiment did not cover the full duration of the generation of the complete resonance profile of the (2s2p) 1 P o state on the energy axis, which was calculated to be about 180 femtoseconds (i.e., about 10 lifetimes) [16].…”

“…The second part, Sections 4-6, points to experimental findings and corresponding discussions concerning prototypical ultrafast electronic processes and phenomena in N-electron atoms [7][8][9][10][11] and compares them to results and discussions by the Athens team published from 1996 to 2011 [1][2][3][4][11][12][13][14][15][16][17]. Papers [7][8][9][10][11][12][13][14][15][16][17] have to do with the quantitative understanding and the possibility of credible prediction of the time-dependent many-electron physics of attosecond-resolved electron rearrangements in many-electron systems.…”

“…In recent publications by Kaldun and Blättermann et al [7,8], by Krausz [9], and by Isinger et al [10], there is discussion and presentation of results of new experiments on time-resolved hyperfast electron dynamics in many-electron systems, made possible through the application of modern techniques of spectroscopy with attosecond resolution. These measurements and the corresponding implications are directly related to, and in harmony with, our proposals and theoretical results that were produced in the '00s, based on time-dependent formalisms that allow the practical use of many-electron wavefunctions [1][2][3][4][5][6][11][12][13][14][15][16][17].…”