2020, Wragg, J., Benda, J., Mašín, Z., Armstrong, G.S.J., Clarke, D.D.A., Brown, A.C., Ballance, C., Harvey, A.G., Houfek, K., Sunderland, A., Plummer, M., Gorfinkiel, J.D., Van Der Hart, H.

We describe and illustrate a number of recent developments of the atomic and molecular ab initio R-matrix suites for both time-dependent calculations of ultrafast laser-induced dynamics and time-independentcalculations of photoionization and electron scattering. © 2019 Published under licence by IOP Publishing Ltd.

2020, Schmidt, P., Music, V., Hartmann, G., Boll, R., Erk, B., Bari, S., Allum, F., Baumann, T.M., Brenner, G., Brouard, M., Burt, M., Coffee, R., Dörner, S., Galler, A., Grychtol, P., Heathcote, D., Inhester, L., Kazemi, M., Larsson, M., Li, Z., Lutmann, A., Manschwetus, B., Marder, L., Mason, R., Moeller, S., Osipov, T., Otto, H., Passow, C., Rolles, D., Rupprecht, P., Schubert, K., Schwob, L., Thomas, R., Vallance, C., Von Korff Schmising, C., Wagner, R., Walter, P., Wolf, T.J.A., Zhaunerchyk, V., Meyer, M., Ehresmann, A., Knie, A., Demekhin, P.V., Ilchen, M.

(X-ray) free-electron lasers are employed to site specifically interrogate atomic fragments during ultra-fast photolysis of chiral molecules via time-resolved photoelectron circular dichroism. © 2020 Institute of Physics Publishing. All rights reserved.

2022, Morales, Felipe, Richter, Maria, Ivanov, Misha, Husakou, Anton

It is commonly assumed that for low-intensity short optical pulses far from resonance, the third-order optical nonlinear response is instantaneous. We solve the three-dimensional time-dependent Schrödinger equation for the hydrogen atom and show that this is not the case: the polarization is not simply proportional to the cube of the electric field even at low intensities. We analyze the fundamental-frequency and third-harmonic nonlinear susceptibilities of hydrogen, investigate their dependence on intensity, and find that the delays in the Kerr response rapidly approach the femtosecond time-scale at higher intensities, while the delays in the third harmonic generation remain much lower. We also propose an experimental scheme to detect and characterize the above effects.