Quantitative analysis of aligned-molecule photoelectron angular distributions

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10506676" target="_blank" >RIV/00216208:11320/25:10506676 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=XxgcZkBd7k" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=XxgcZkBd7k</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevA.111.012815" target="_blank" >10.1103/PhysRevA.111.012815</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Quantitative analysis of aligned-molecule photoelectron angular distributions

Popis výsledku v původním jazyce

Molecular frame photoelectron angular distributions (MFPADs) provide the full available detail of the photoionization process. Careful analysis of the evolving photoelectron angular distribution during the coherent rotation of a nonadiabatically aligned sample of molecules allows the detail which is smoothed out by orientational averaging in the laboratory frame to be resolved. Here we exploit a high flux monochromated HHG lightsource to provide single-photon photoelectron angular distributions of field-free aligned molecules. Our measurements are sensitive to alignment frame variations in even beta n parameters up to n = 6 in the PADs of the first four ionization channels of OCS, allowing for rigorous benchmarking of the cutting edge theoretical methods used for simulation of MFPADs. We demonstrate that experimentally derived molecular alignment distributions may be combined with theoretical MFPADs to generate theoretical alignment-frame PADs which provide a quantitative comparison to the experimental beta n parameters. The experimental data and ePSproc simulated PADs show quantitative agreement and sensitivity to picometer-scale changes in the molecular geometry. This combined methodology therefore provides a versatile way of studying geometry-sensitive continuum structural features for nondissociative ionization processes which may not be studied in the recoil frame. These measurements therefore provide a strict test of the theoretical descriptions and will stand as benchmark measurements for future comparisons to higher-level theory.

Název v anglickém jazyce

Quantitative analysis of aligned-molecule photoelectron angular distributions

Popis výsledku anglicky

Molecular frame photoelectron angular distributions (MFPADs) provide the full available detail of the photoionization process. Careful analysis of the evolving photoelectron angular distribution during the coherent rotation of a nonadiabatically aligned sample of molecules allows the detail which is smoothed out by orientational averaging in the laboratory frame to be resolved. Here we exploit a high flux monochromated HHG lightsource to provide single-photon photoelectron angular distributions of field-free aligned molecules. Our measurements are sensitive to alignment frame variations in even beta n parameters up to n = 6 in the PADs of the first four ionization channels of OCS, allowing for rigorous benchmarking of the cutting edge theoretical methods used for simulation of MFPADs. We demonstrate that experimentally derived molecular alignment distributions may be combined with theoretical MFPADs to generate theoretical alignment-frame PADs which provide a quantitative comparison to the experimental beta n parameters. The experimental data and ePSproc simulated PADs show quantitative agreement and sensitivity to picometer-scale changes in the molecular geometry. This combined methodology therefore provides a versatile way of studying geometry-sensitive continuum structural features for nondissociative ionization processes which may not be studied in the recoil frame. These measurements therefore provide a strict test of the theoretical descriptions and will stand as benchmark measurements for future comparisons to higher-level theory.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10300 - Physical sciences

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

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

15

Strana od-do

012815

Kód UT WoS článku

001413197800004

EID výsledku v databázi Scopus

2-s2.0-85218635341