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arXiv · 1209.3506

Time-resolved resonant photoionization of He using a time-dependent Feshbach method with ultrashort laser pulses

C. M. Granados-Castro·J. L. Sanz-Vicario
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Abstract

We study the photoionization and autoionization of Helium atom subject to ultrashort laser pulses by using a Feshbach formalism in the time domain. We solve the time-dependent Schrödinger equation in terms of a configuration interaction (CI) spectral method, in which the total wavefunction is expanded with configurations defined within bound-like ($\mathcal{Q}$) and scattering-like ($\mathcal{P}$) halfspaces. The method allowsone to provide accurate descriptions of both the atomic structure (energy positions and widths) and the photodynamics. We illustrate our approach by i) calculating the time-resolved one-photon ionization below the He$^+$ ($n$=2) ionization threshold, from $1^1S^e$ and $2 ^1P^o$ initial states, then reaching the lowest autoionizing states of $^1S^e$, $^1P^o$ and $^1D^e$ final symmetries ii) studing the temporal formation of the Fano profile of $^1P^o$ resonances and iii) showing its performance in obtaining the perturbative long-time limit of one- and two-photon ionization cross sections using ultrashort laser pulses following a recently developed procedure in Phys. Rev. A, {\bf 77}, 032716 (2008).

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C. M. Granados-Castro, J. L. Sanz-Vicario. 2012-09-16. Time-resolved resonant photoionization of He using a time-dependent Feshbach method with ultrashort laser pulses. https://doi.org/10.1088/0953-4075%2F46%2F5%2F055601

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