Cord Arnold
Koordinator för Mötesplats Rydbergseminarier
Attosecond timing of electron emission from a molecular shape resonance
Författare
Summary, in English
Shape resonances in physics and chemistry arise from the spatial confinement of a particle by a potential barrier. In molecular photoionization, these barriers prevent the electron from escaping instantaneously, so that nuclei may move and modify the potential, thereby affecting the ionization process. By using an attosecond two-color interferometric approach in combination with high spectral resolution, we have captured the changes induced by the nuclear motion on the centrifugal barrier that sustains the well-known shape resonance in valence-ionized N2. We show that despite the nuclear motion altering the bond length by only 2%, which leads to tiny changes in the potential barrier, the corresponding change in the ionization time can be as large as 200 attoseconds. This result poses limits to the concept of instantaneous electronic transitions in molecules, which is at the basis of the Franck-Condon principle of molecular spectroscopy.
Avdelning/ar
- Atomfysik
- NanoLund: Centre for Nanoscience
- Synkrotronljusfysik
Publiceringsår
2020
Språk
Engelska
Sidor
7762-7762
Publikation/Tidskrift/Serie
Science Advances
Volym
6
Issue
31
Dokumenttyp
Artikel i tidskrift
Förlag
American Association for the Advancement of Science (AAAS)
Ämne
- Atom and Molecular Physics and Optics
Status
Published
Projekt
- Attosecond chronoscopy of electron wave-packets probing entanglement and time-ordering of quantum processes
ISBN/ISSN/Övrigt
- ISSN: 2375-2548