Modulation of Attosecond Beating by Resonant Two-Photon Transition

29th International Conference on Photonic, Electronic, and Atomic Collisions

Galán, Álvaro Jiménez^1 ; Argenti, Luca^1 ; Martín, Fernando^1,2,3

Departamento de Química, Universidad Autónoma de Madrid, Módulo 13, Madrid

28049, Spain^1

Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanociencia), Cantoblanco, Madrid

28049, Spain^2

Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, Madrid

28049, Spain^3

关键词: Attoseconds;    Direct paths;    Geometrical representation;    Phase profile;    Phase variation;    Photon energy;    Two-photon transitions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/635/1/012005/pdf
DOI  :  10.1088/1742-6596/635/1/012005

来源: IOP

【 摘 要 】

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 π 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.