Modulation of attosecond beating by resonant two-photon transition

Abstract

We present an analytical model that characterizes two-photon transitions in the presence of autoionising states. We applied this model to interpret resonant RABITT spectra, and show that, as a harmonic traverses a resonance, the phase of the sideband beating significantly varies with photon energy. This phase variation is generally very different from the $\pi$ jump observed in previous works, in which the direct path contribution was negligible. We illustrate the possible phase profiles arising in resonant two-photon transitions with an intuitive geometrical representation.

Manuscript for the Proceedings of the XXIX International Conference on Photonic, Electronic, and Atomic Collisions (ICPEAC XXIX), held in Toledo (Spain) July 22-28 2015, where Álvaro Jiménez Galán gave special report presentation with the same title as the manuscript

References in corpus (2)

• Phase Measurement of Resonant Two-Photon Ionization in Helium
• Modulation of attosecond beating in resonant two-photon ionization