Isotopic effects in molecular attosecond photoelectron interferometry

• DOI: 10.48550/arxiv.2303.01329
• Publication Date: 2023-01-01
• Authors: Dominik Ertel; David Busto; I. Makos; Marvin Schmoll; Jakub Benda; Hamed Ahmadi; Matteo Moioli; Fabio Frassetto; Luca Poletto; C. D. Schröter; Thomas Pfeifer; R. Moshammer; Zdeněk Mašín; Serguei Patchkovskii; G. Sansone
• Keywords: Attosecond; Extreme ultraviolet; Ultraviolet photoelectron spectroscopy; Photon energy

Isotopic substitution in molecular systems can affect fundamental properties including the energy position and spacing of electronic, vibrational rotational levels, thus modifying dynamics associated to their coherent superposition. In extreme ultraviolet spectroscopy, photoelectron leaving molecule after absorption a single photon trigger an ultrafast nuclear motion cation, which lead, eventually, fragmentation. This depends on mass constituents showing, general, significant isotopic dependence. time-resolved attosecond interferometry, is accompanied by exchange additional quantum (typically infrared spectral range) with photoelectron-photoion system, offering opportunity investigate time influence characteristics photoionisation dynamics. Here we show that interferometry sensitive investigating two-color spectra measured mixture methane (CH$_4$) deuteromethane (CD$_4$). The dependence manifests itself modification amplitude contrast oscillations peaks generated field two isotopologues. observed effects are interpreted considering differences evolution autocorrelation functions molecules.