Angular momentum dependence in multiphoton ionization and attosecond time delays

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10506680" target="_blank" >RIV/00216208:11320/25:10506680 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=QqnolKfCPd" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=QqnolKfCPd</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevA.111.013110" target="_blank" >10.1103/PhysRevA.111.013110</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Angular momentum dependence in multiphoton ionization and attosecond time delays

Popis výsledku v původním jazyce

Multiphoton interference measurements in attosecond physics, e.g., the reconstruction of attosecond beating by interference of two-photon transitions (RABITT), are the typical methods of choice to experimentally access the photoionization delay in atoms and molecules. The exact relation between the measurable multiphoton delays and the theoretical single-photon delays is typically modeled by correction terms, continuum-continuum delays, obtained from a high-energy limit of the theory. However, these are unreliable at photoelectron kinetic energies smaller than about 10 eV, and do not have photoemission angular dependence. In this work we develop an accurate analytic alternative that gives accurate correction terms even at very low energies. Our method is computationally very straightforward, predicts correct multiphoton photoelectron angular distributions as well as the expected angular dependence of the continuum-continuum delay. We validate the approach theoretically against state-of-the-art ab initio calculations as well as experimentally with a two-harmonic RABITT setup, which properly separates different higher-order multiphoton pathways and offers a promising way of analyzing congested molecular photoionization spectra.

Název v anglickém jazyce

Angular momentum dependence in multiphoton ionization and attosecond time delays

Popis výsledku anglicky

Multiphoton interference measurements in attosecond physics, e.g., the reconstruction of attosecond beating by interference of two-photon transitions (RABITT), are the typical methods of choice to experimentally access the photoionization delay in atoms and molecules. The exact relation between the measurable multiphoton delays and the theoretical single-photon delays is typically modeled by correction terms, continuum-continuum delays, obtained from a high-energy limit of the theory. However, these are unreliable at photoelectron kinetic energies smaller than about 10 eV, and do not have photoemission angular dependence. In this work we develop an accurate analytic alternative that gives accurate correction terms even at very low energies. Our method is computationally very straightforward, predicts correct multiphoton photoelectron angular distributions as well as the expected angular dependence of the continuum-continuum delay. We validate the approach theoretically against state-of-the-art ab initio calculations as well as experimentally with a two-harmonic RABITT setup, which properly separates different higher-order multiphoton pathways and offers a promising way of analyzing congested molecular photoionization spectra.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10300 - Physical sciences

Projekt

<a href="/cs/project/GJ20-15548Y" target="_blank" >GJ20-15548Y: Nové mechanizmy požkození DNA působením elektronů a ultrafialového záření</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physical review A

ISSN

2469-9926

e-ISSN

2469-9934

Svazek periodika

111

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

13

Strana od-do

013110

Kód UT WoS článku

001415485400004

EID výsledku v databázi Scopus

2-s2.0-85215834991