Bonn 2025 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 24: Attosecond Physics II (joint session A/MO)

MO 24.4: Vortrag

Donnerstag, 13. März 2025, 12:00–12:15, GrHS Mathe

attosecond coherent control using nonlinear processes driven by a seeded FEL — •Sooraj R.S¹, Ioannis Makos¹, Michele Di Fraia², Oksana Plekan², Praveen Maroju³, David Busto³, S Hartweg¹, David Garzella², Kevin Prince², A Demidovich², Johan Mauritsson³, Marvin Schmoll¹, Aaron Ngai¹, R Moshammer⁴, C Medina⁴, Muwaffaq Mourtada⁴, T Pfeifer⁴, Tamas Csizmadia⁵, Debobrata Rajak⁵, Klemen Bucar⁶, Andrej Mihelic⁶, Matjaz Zitnik⁶, Uwe Thumm⁸, Fernando M Garcia⁷, Carlo Callegari², Elena Gryzlova¹, and Giuseppe Sansone¹ — ¹Albert Ludwigs Universität Freiburg,Germany — ²Elettra Sincrotrone Trieste,Italy — ³Lund University, Sweden — ⁴MPI für Kernphysik Heidelberg,Germany — ⁵ELI ALPS , Hungary — ⁶Jožef Stefan Institute,Slovenia — ⁷Universidad Autónoma de Madrid,Spain — ⁸Kansas State University, USA

In this study, we investigate interference between two coherent pathways in two-photon double ionization (TPDI) of Ar, mediated by the 3s3p⁶5p and 3s3p⁶6p[1] states, and in N₂ through the Hopfield resonances 3dσ_g and 3dπ_g[2]. Using phase-controlled XUV radiation from FEL FERMI, we record photoelectron spectra from TPDI to study how intermediate resonances affect the contrast and phase of oscillations from two nonlinear-coherent paths.This study highlights the critical role of intermediate resonances in controlling the interference dynamics of multiphoton ionization processes.[1] Elena V G et al. In: The Eu Phy Jo D 73 (2019)[2] M Reduzzi et al. In: Jo of Phy B:AMO Physics 49.6 (2016)

Keywords: Coherent control; free electron lasers; two photon ionization; nonlinear process