Time delay in XUV/IR photoionization of H2O

Abstract

We solve the time-dependent Schrödinger equation describing a water molecule driven by a superposition of the XUV and IR pulses typical for a RABBITT experiment. This solution is obtained by a combination of the time-dependent coordinate scaling and the density functional theory with self-interaction correction. Results of this solution are used to determine the time delay in photoionization of the water and hydrogen molecules.

Analysis of RABITT time delays using the stationary multi-photon molecular R-matrix approach

“…Only electron emission in the direction of the polarization vector was studied. The same configurations were studied by Serov and Kheifets [14]. [14] and asymptotic corrections of Dahlström et al [12] and Ivanov and Smirnova [25], the middle row shows the magnitude of the one-photon ionization dipole per partial wave, and the bottom row contains the phases of these dipoles, partial and total.…”

“…The same configurations were studied by Serov and Kheifets [14]. [14] and asymptotic corrections of Dahlström et al [12] and Ivanov and Smirnova [25], the middle row shows the magnitude of the one-photon ionization dipole per partial wave, and the bottom row contains the phases of these dipoles, partial and total. The shaded region 35-50 eV highlights the interval of energies where the two contributing partial wave amplitudes exchange in magnitude and their interference gives rise to the feature in the time delays.…”

“…To provide such benchmark results, we used the molecular RMT [36]. In all timedependent calculations performed as part of this work we used the same combination of an attosecond XUV pulse train (APT, consisting of odd harmonics of the IR field frequency) and a probe IR pulse as given in [14]. The time evolution was calculated for 19 uniformly spaced relative temporal offsets of the two pulses to cover one full period of the IR field.…”

Photoionization delays in xenon using single-shot referencing in the collinear back-focusing geometry

“…An important feat of attosecond science in the recent years has been its application in accessing the photoemission time delay in atoms [1][2][3], solids [4][5][6] and molecules [7,8]. With the recent developments, attosecond chronoscopy has become a major area of research within attosecond science since its first application by Cavalieri et al [4].…”

Multi-photon above threshold ionization of multi-electron atoms and molecules using the R-matrix approach

“…Simulations of the multi-photon perturbative processes can provide valuable insight, whether due to the perturbative field used, or thanks to specific selection rules in effect that restrict the process to a specific N-photon transition. An example of the latter is the RABITT mechanism for measuring the photoionization time delays [21][22][23][24], including its multi-sideband (multi-photon) variant [25]. Similarly, absorption of counter-rotating circularly polarised photons via several indistinguishable interfering pathways was shown to lead to characteristic electron vortices in the momentum angular distribution [26][27][28][29].…”