Journal ArticleDOI
Optical properties of protonated Rhodamine 19 isomers in solution and in the gas phase
Konstantin Chingin,Roman M. Balabin,Vladimir Frankevich,Huanwen Chen,Konstantin Barylyuk,Robert J. Nieckarz,Alexey Fedorov,Renato Zenobi +7 more
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TLDR
The o-R19H(+) was found to have the largest Stokes shift in the gas phase (around 10 nm), suggesting that an intramolecular relaxation operates in the excited electronic state for this isomer.Abstract:
Visible light absorption and fluorescence of three positional isomers of protonated Rhodamine 19 (o-, m- and p-R19H(+)) were studied in solution and in the gas phase. In solution, strong solvatochromic effects lead to spectral shifts between rhodamine isomers. In contrast, in the gas phase, these species were found to exhibit very similar fluorescence, while pronounced differences were observed in the absorption spectra. The o-R19H(+) was found to have the largest Stokes shift in the gas phase (around 10 nm), suggesting that an intramolecular relaxation operates in the excited electronic state for this isomer. Several mechanisms for this relaxation are proposed, such as the change of the dihedral angle between the carboxyphenyl group and the xanthene chromophore or that between the carboxylic group and the phenyl ring.read more
Citations
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Fluorescence Lifetimes and Quantum Yields of Rhodamine Derivatives: New Insights from Theory and Experiment
Marika Savarese,Marika Savarese,Anna Aliberti,Ilaria De Santo,Edmondo Battista,Filippo Causa,Paolo A. Netti,Nadia Rega,Nadia Rega +8 more
TL;DR: It is shown that the radiative lifetime of rhodamines can be correlated to the charge transfer from the phenyl toward the xanthene moiety occurring upon the S(0) ← S(1) de-excitation, and to thexanthene/phenyl relative orientation assumed in the S (1) minimum structure.
Journal ArticleDOI
Time-dependent approach to spin-vibronic coupling: Implementation and assessment
TL;DR: The generalization of a time-dependent method for the calculation of intersystem crossing (ISC) rates in the Condon approximation is presented, based on the generating function formalism and the multi-mode harmonic oscillator approximation.
Journal ArticleDOI
Fluorescence lifetimes of rhodamine dyes in vacuo
TL;DR: In this paper, a quadruple ion trap mass spectrometer coupled with a tunable laser excitation source is used for ion storage and irradiation, and the time-resolved data are well fit using single exponential decays.
Journal ArticleDOI
A cylindrical quadrupole ion trap in combination with an electrospray ion source for gas-phase luminescence and absorption spectroscopy
TL;DR: By replacing the optical system with a channeltron detector, it is demonstrated that the setup can also be used for gas-phase action spectroscopy where either depletion or fragmentation is monitored to provide an indirect measurement on the absorption spectrum of the ion.
Journal ArticleDOI
Non-radiative decay paths in rhodamines: new theoretical insights.
Marika Savarese,Marika Savarese,Umberto Raucci,Carlo Adamo,Carlo Adamo,Paolo A. Netti,Ilaria Ciofini,Nadia Rega,Nadia Rega +8 more
TL;DR: An electronic density based index, the so called DCT index, is proposed as a new tool to assess and quantify the nature of the excited states involved in non-radiative decays near the region of their intersection to rationalize the photophysical behavior of complex molecular systems.
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