Estimation of damped oscillation associated spectra from ultrafast transient absorption spectra

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F16%3A10364740" target="_blank" >RIV/00216208:11320/16:10364740 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1063/1.4966196" target="_blank" >http://dx.doi.org/10.1063/1.4966196</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/1.4966196" target="_blank" >10.1063/1.4966196</a>

Result language

angličtina

Original language name

Estimation of damped oscillation associated spectra from ultrafast transient absorption spectra

Original language description

When exciting a complex molecular system with a short optical pulse, all chromophores present in the system can be excited. The resulting superposition of electronically and vibrationally excited states evolves in time, which is monitored with transient absorption spectroscopy. We present a methodology to resolve simultaneously the contributions of the different electronically and vibrationally excited states from the complete data. The evolution of the excited states is described with a superposition of damped oscillations. The amplitude of a damped oscillation cos(omega(n)t) exp(-gamma(n)t) as a function of the detection wavelength constitutes a damped oscillation associated spectrum DOAS(n)(lambda) with an accompanying phase characteristic phi(n)(lambda). In a case study, the cryptophyte photosynthetic antenna complex PC612 which contains eight bilin chromophores was excited by a broadband optical pulse. Difference absorption spectra from 525 to 715 nm were measured until 1 ns. The population dynamics is described by four lifetimes, with interchromophore equilibration in 0.8 and 7.5 ps. We have resolved 24 DOAS with frequencies between 130 and 1649 cm(-1) and with damping rates between 0.9 and 12 ps(-1). In addition, 11 more DOAS with faster damping rates were necessary to describe the &quot;coherent artefact.&quot; The DOAS contains both ground and excited state features. Their interpretation is aided by DOAS analysis of simulated transient absorption signals resulting from stimulated emission and ground state bleach. (C) 2016 Author(s).

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10300 - Physical sciences

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2016

Confidentiality

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

Name of the periodical

Journal of Chemical Physics

ISSN

0021-9606

e-ISSN

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Volume of the periodical

145

Issue of the periodical within the volume

17

Country of publishing house

US - UNITED STATES

Number of pages

12

Pages from-to

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UT code for WoS article

000388105100017

EID of the result in the Scopus database

2-s2.0-84994251911