Spectro-temporal symmetry in action-detected optical spectroscopy: Highlighting excited-state dynamics in large systems

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10500246" target="_blank" >RIV/00216208:11320/25:10500246 - isvavai.cz</a>

Výsledek na webu

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

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/5.0255316" target="_blank" >10.1063/5.0255316</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Spectro-temporal symmetry in action-detected optical spectroscopy: Highlighting excited-state dynamics in large systems

Popis výsledku v původním jazyce

Multidimensional optical spectroscopy observes transient excitation dynamics through time evolution of spectral correlations. Its action-detected variants offer several advantages over the coherent detection and are thus becoming increasingly widespread. Nevertheless, a drawback of action-detected spectra is the presence of a stationary background of the so-called incoherent mixing of excitations from independent states that resembles a product of ground-state absorption spectra and obscures the excited-state signal. This issue is especially problematic in fluorescence-detected two-dimensional electronic spectroscopy (F-2DES) and fluorescence-detected pump-probe spectroscopy (F-PP) of extended systems, where large incoherent mixing arises from efficient exciton-exciton annihilation. In this work, we demonstrate on the example of F-2DES and F-PP an inherent spectro-temporal symmetry of action-detected spectra, which allows general, system-independent subtraction of any stationary signals including incoherent mixing. We derive the expressions for spectra with normal and reversed time ordering of the pulses, relating these to the symmetry of the system response. As we show both analytically and numerically, the difference signal constructed from spectra with normal and reversed pulse ordering is free of incoherent mixing and highlights the excited-state dynamics. We further verify the approach on the experimental F-PP spectra of a molecular squaraine heterodimer and the F-2DES spectra of the photosynthetic antenna light-harvesting complex 2 of purple bacteria. The approach is generally applicable to action-detected 2DES and pump-probe spectroscopy without experimental modifications and is independent of the studied system, enabling their application to large systems such as molecular complexes. (c) 2025 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license(https://creativecommons.org/licenses/by/4.0/).

Název v anglickém jazyce

Spectro-temporal symmetry in action-detected optical spectroscopy: Highlighting excited-state dynamics in large systems

Popis výsledku anglicky

Multidimensional optical spectroscopy observes transient excitation dynamics through time evolution of spectral correlations. Its action-detected variants offer several advantages over the coherent detection and are thus becoming increasingly widespread. Nevertheless, a drawback of action-detected spectra is the presence of a stationary background of the so-called incoherent mixing of excitations from independent states that resembles a product of ground-state absorption spectra and obscures the excited-state signal. This issue is especially problematic in fluorescence-detected two-dimensional electronic spectroscopy (F-2DES) and fluorescence-detected pump-probe spectroscopy (F-PP) of extended systems, where large incoherent mixing arises from efficient exciton-exciton annihilation. In this work, we demonstrate on the example of F-2DES and F-PP an inherent spectro-temporal symmetry of action-detected spectra, which allows general, system-independent subtraction of any stationary signals including incoherent mixing. We derive the expressions for spectra with normal and reversed time ordering of the pulses, relating these to the symmetry of the system response. As we show both analytically and numerically, the difference signal constructed from spectra with normal and reversed pulse ordering is free of incoherent mixing and highlights the excited-state dynamics. We further verify the approach on the experimental F-PP spectra of a molecular squaraine heterodimer and the F-2DES spectra of the photosynthetic antenna light-harvesting complex 2 of purple bacteria. The approach is generally applicable to action-detected 2DES and pump-probe spectroscopy without experimental modifications and is independent of the studied system, enabling their application to large systems such as molecular complexes. (c) 2025 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license(https://creativecommons.org/licenses/by/4.0/).

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10301 - Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)

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

Journal of Chemical Physics

ISSN

0021-9606

e-ISSN

1089-7690

Svazek periodika

162

Číslo periodika v rámci svazku

12

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

11

Strana od-do

124204

Kód UT WoS článku

001456931700005

EID výsledku v databázi Scopus

2-s2.0-105001662381