Ultrafast Stimulated Emission Spectroscopy

Blanchard, G. J.

doi:10.1007/0-306-47070-5_7

Cited by 2 publications

(1 citation statement)

References 138 publications

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“…The extraction of vibrational population relaxation information from stimulated emission transients has been described in detail before. ,,,,, The chromophore behaves as a strongly coupled three-level system. The three levels are the vibrationless ground electronic state, S 0 ( v =0) , the ground vibrational state of interest, S 0 ( v  v ) , and the vibrationless excited electronic state S 1 ( v =0) .…”

Section: Resultsmentioning

confidence: 99%

Orientational and Vibrational Relaxation Dynamics of Perylene in the Cyclohexane–Ethanol Binary Solvent System

Qiu

Blanchard

2014

J. Phys. Chem. B

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The rotational dynamics and vibrational population relaxation of the nonpolar probe molecule perylene have been studied in a series of ethanol-cyclohexane binary solvent mixtures, with the goal of relating solvent system composition to local organization. Steady-state spectroscopic data show that there is a discontinuous dependence of the spectroscopic origin on binary solvent system composition for perylene. Both rotational diffusion and vibrational population relaxation time constants show a clear discontinuity between 5% and 7.5% (v/v) ethanol in cyclohexane, suggesting a discontinuous change on molecular scale rearrangement in the chromophore local environment. We interpret these results in the context of the chromophore residing in an environment that is not homogeneous on the molecular scale and changes in its average conformation with binary solvent system composition.

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Section: Resultsmentioning

confidence: 99%

Orientational and Vibrational Relaxation Dynamics of Perylene in the Cyclohexane–Ethanol Binary Solvent System

Qiu

Blanchard

2014

J. Phys. Chem. B

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Exploring solvatochromism in Nile Blue 690 dye: Evaluating dipole moments across the ground and excited states

Hirematada,

Patil,

Inamdar

et al. 2024

Eur J Chem

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This study investigates the photophysical properties of Nile Blue 690 (NB-690) dye using spectroscopic techniques. Absorption and fluorescence spectroscopy were used to analyze NB-690, revealing pronounced bathochromic shifts in both absorption and fluorescence spectra, indicative of the π → π* transition. The study focuses on estimating ground- and excited-state dipole moments of NB-690 through solvatochromic shifts in absorption and fluorescence spectra. Various computational methods, including the Bilot-Kawski approach for ground state dipole moment computation, and the Reichardt correlation, the Bakhshiev, the Lippert-Mataga, and the Kawski-Chamma-Viallet methods for calculating the excited state dipole moment, were utilized. The results demonstrate excited-state dipole moment values of 6.922, 5.529, 5.529, 5.529, and 4.615 D, respectively, using the Lippert-Mataga, Bakhshiev, Kawski-Chamma-Viallet and solvent polarity correlation approaches. Significantly, the excited state dipole moment surpasses the ground state dipole moment, attributed to the significant π-electron density redistribution upon excitation. Intriguingly, both excited- and ground-state dipole moments align parallel to each other at a 0° angle. In general, these findings underscore the potential utility of NB-690 in optoelectronic applications, highlighting its responsiveness to environmental signals and providing valuable information for further exploration in the field.

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Ultrafast Stimulated Emission Spectroscopy

Cited by 2 publications

References 138 publications

Orientational and Vibrational Relaxation Dynamics of Perylene in the Cyclohexane–Ethanol Binary Solvent System

Orientational and Vibrational Relaxation Dynamics of Perylene in the Cyclohexane–Ethanol Binary Solvent System

Exploring solvatochromism in Nile Blue 690 dye: Evaluating dipole moments across the ground and excited states

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