scholarly journals Solvation Dynamics Studied by Picosecond Fluorescence: Microscopic Reorientation and Longitudinal Relaxation of the Solvent

1990 ◽  
Vol 10 (5-6) ◽  
pp. 413-429 ◽  
Author(s):  
A. Declémy ◽  
C. Rulliére ◽  
Ph. Kottis
Keyword(s):  
Time Dependent ◽  
Solvation Dynamics ◽  
Specific Interactions ◽  
Longitudinal Relaxation Time ◽  
Time Resolved ◽  
Different Temperatures ◽  
Reorientation Time ◽  
Longitudinal Relaxation ◽  
Solvent Molecules ◽  
Alcohol Solvents

The dynamics of the Time-Dependent Fluorescence Shift (TDFS) of a rigid polar excited probe dissolved in alcohol solvents at different temperatures have been studied by picosecond time-resolved spectroscopy. The results are compared to previously published results on well characterized polar systems. These results show that solvation dynamics in such systems are strongly scaled by the microscopic (singleparticle) reorientation time τM of the solvent molecules and/or by the (macroscopic) longitudinal relaxation time τL of the solvent. The key point governing this scaling is the relative interaction between the solvent molecules and the probe compared to the interaction between the solvent molecules. It is also shown that specific interactions, such as hydrogen bonded-complex formation, may play an important role.

Temperature-dependent reorientation dynamics of laser dyes in alkane and alcohol solvents

2013 ◽  
Vol 91 (9) ◽  
pp. 677-681 ◽  
Author(s):  
Y.F. Nadaf ◽  
C.G. Renuka ◽  
U.S. Raikar
Keyword(s):  
Relaxation Times ◽  
Laser Dyes ◽  
Temperature Dependent ◽  
Fluorescence Depolarization ◽  
Time Resolved ◽  
Structural Differences ◽  
Reorientation Time ◽  
Reorientation Dynamics ◽  
Alcohol Solvents ◽  
Coumarin 6

The rotational dynamics of similar sized coumarin 6 (C6), coumarin 7 (C7), and coumarin 30 (C30) laser dyes has been studied in alkane and alcohol solvents using steady-state and time-resolved fluorescence depolarization methods. The estimated rotational reorientation times of these probes are observed to vary linearly as a function of viscosity over the range of temperatures studied. It is found that the rotational reorientation time measurements of these molecules in alcohol and alkane typically have relaxation times on the order of picoseconds. The rotational reorientation times of the C7 molecule are greater than those of the C6 and C30 molecules. It was observed that C7 rotates faster in both the solvents than C6 and C30, indicating that the effects of the medium and structural differences of molecules lead to slower rotation.

scholarly journals Ground- and excited-state characteristics in photovoltaic polymer N2200

RSC Advances ◽  
2021 ◽  
Author(s):  
Guanzhao Wen ◽  
Xianshao Zou ◽  
Rong Hu ◽  
Jun Peng ◽  
Zhifeng Chen ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Excited State ◽  
Steady State ◽  
Excited States ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Time Dependent ◽  
Functional Theory ◽  
Time Resolved ◽  
Dependent Density

Ground- and excited-states properties of N2200 have been studied by steady-state and time-resolved spectroscopies as well as time-dependent density functional theory calculations.

scholarly journals Unravelling the mechanisms of vibrational relaxation in solution

2017 ◽  
Vol 8 (4) ◽  
pp. 3062-3069 ◽  
Author(s):  
Michael P. Grubb ◽  
Philip M. Coulter ◽  
Hugo J. B. Marroux ◽  
Andrew J. Orr-Ewing ◽  
Michael N. R. Ashfold
Keyword(s):  
Vibrational Relaxation ◽  
Chlorinated Solvents ◽  
Time Resolved ◽  
Vibrational Cooling ◽  
Solvent Molecules

Time resolved vibrational cooling towards equilibrium in perfluorinated and chlorinated solvents provides detailed insights into the transfer of energy between solute and solvent molecules.

TIME DEPENDENT DENSITY FUNCTIONAL METHODS AND THEIR APPLICATION TO CHEMICAL PHYSICS

2004 ◽  
Vol 03 (01) ◽  
pp. 117-144 ◽  
Author(s):  
AKIRA YOSHIMORI
Keyword(s):  
Density Functional ◽  
Nonlinear Effects ◽  
Functional Method ◽  
Time Dependent ◽  
Solvation Dynamics ◽  
Chemical Physics ◽  
Functional Theory ◽  
Polar Liquids ◽  
Density Functional Methods ◽  
Functional Methods

This article reviews microscopic development of time dependent functional method and its application to chemical physics. It begins with the formulation of density functional theory. The time dependent extension is discussed after the equilibrium formulation. Its application is explained by solvation dynamics. In addition, it reviews studies of nonlinear effects on polar liquids and simple mixtures.

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