Angular anisotropy of time delay in XUV+IR photoionization ofH2+

Abstract

We develop a novel technique for modeling of atomic and molecular ionization in superposition of XUV and IR fields with characteristics typical for attosecond streaking and RABBITT experiments. The method is based on solving the time-dependent Schrödinger equation in the coordinate frame expanding along with the photoelectron wave packet. The efficiency of the method is demonstrated by calculating angular anisotropy of photoemission time delay of the H + 2 ion in a field configuration of recent RABBITT experiments.

Angle-dependent time delay in two-color XUV+IR photoemission of He and Ne

“…The angular dependence of the RABBITT time delay in molecules becomes even more pronounced because of an additional anisotropy relative to the molecular axis. This can be seen from a recent theoretical study on the hydrogen molecular ion [23]. Angle-integrated RABBITT experiments have been reported on other molecules [24] and work is underway to make this measurement angle resolved.…”

Time delay in XUV/IR photoionization of H2O

“…We combined the time-dependent coordinate scaling (TDCS) method, which we developed earlier for modeling of RABBITT experiments [3], with the density functional theory with self-interaction correction (DFT-SIC). An advantage of the TDCS method is the direct solution of the time-dependent Schrödinger equation driven by the superposition of the XUV and IR pulses without the splitting of the atomic time delay into the Wigner and CLC components.…”

“…Unlike in the previous treatment [3], here we use a smooth switching of the imaginary absorbing potential, by setting…”

“…This equation is solved by a combination of the time-dependent coordinate scaling (TDCS) and the density functional theory with self-interaction correction (DFT-SIC). We applied the TDCS technique in our earlier work to describe a RABBITT measurement on the molecular H + 2 ion [3]. An advantage of this technique is that the TDSE is solved directly in the XUV and IR fields and the calculated (and measurable) time delay is not artificially split into the Wigner and CLC components.…”

Attosecond Intramolecular-Scattering and Vibronic Delay

“…The advances in the generation of ultrafast and tunable light sources [1][2][3][4][5] have allowed us to explore quantum phenomena beyond the limits of femtochemistry [6], by accessing electron dynamics in atoms and molecules at its natural time scale. While numerous studies have already considered various aspects of the photoionization time delay in atoms [7][8][9], the focus of photoionization chronoscopy has recently moved to polyatomic systems, from simple molecules [10][11][12][13][14][15] to complex organic compounds [16,17]. These studies contribute to outline the perimeter of the new discipline of attochemistry [18], in which attosecond spectroscopic techniques are used for real-time control of chemical reactions [19], with the longterm aim of applying them to systems of biological, technological, and medical relevance.…”