Absorption and Fluorescence Spectra of a Rigid Analog of all-trans-1,6-Diphenyl-1,3,5-hexatriene. Solvent-Controlled Order Inversion of 21Ag and 11Bu Energy Levels

1995 ◽  
Vol 117 (43) ◽  
pp. 10761-10762 ◽  
Author(s):  
Jack Saltiel ◽  
Shujun Wang
Keyword(s):  
Fluorescence Spectra ◽  
Energy Levels ◽  
Absorption And Fluorescence Spectra

Spectroscopic Studies of the Energy Levels of the Nd3+ Ion in Single Crystals of SrO.6Al2O3

1988 ◽  
Vol 41 (4) ◽  
pp. 549 ◽  
Author(s):  
H Tajalli
Keyword(s):  
Raman Spectroscopy ◽  
Fluorescence Spectra ◽  
Energy Levels ◽  
Selective Excitation ◽  
Spectroscopic Studies ◽  
Solid State Laser ◽  
Host Lattice ◽  
Absorption And Fluorescence Spectra ◽  
Excitation Spectra ◽  
Laser Material

A detailed study of the polarised absorption and fluorescence spectra and the selective excitation spectra of the Nd3+ ion in the SrO.6Al20 3 host lattice was carried out over the temperature range 4�2 to 500 K. The empirical energy level schemes were determined for two dominant sites of Nd3+ in SrO.6Al20 3 up to 20000 cm -1. The intensity, linewidth and thermal shifts of the transition lines with 4f3 configuration were investigated. The vibrational transitions of Nd3 + : srO.6Al20 3 were also investigated using Raman spectroscopy. The results of the study provide information on the suitability of Nd3+ : srO.6Al20 3 as a solid state laser material.

scholarly journals Study the spectroscopic characteristics of Rhodamine B Dye in Ethanol and Methanol mixture and Calculation the Quantum Efficiency

2012 ◽  
Vol 9 (2) ◽  
pp. 352-358 ◽  
Author(s):  
Baghdad Science Journal
Keyword(s):  
Quantum Efficiency ◽  
Rhodamine B ◽  
Fluorescence Spectra ◽  
Room Temperature ◽  
Energy Levels ◽  
Solvent Polarity ◽  
Wave Number ◽  
Absorption And Fluorescence Spectra ◽  
Spectroscopic Characteristics ◽  
Rhodamine B Dye

The effect of ethanol and methanol solvent, and their mixture has been studied on the absorption and fluorescence spectra of laser dye Rhodamine B at concentration of (10-4) Molar at room temperature. The molar absorption coefficient has been determined for mixture which was (3.223) at wave number (18181.8 cm-1), Also the Quantum Efficiency of the two solvents (ethanol and methanol) and their mixture have been calculated ,which was for mixture spectrum (38.94%) and it was larger comparing with other and solvents. The characteristics of spectrum has been determined by calculating (??) of absorption spectrum for the solvents and its mixture at maximum wave number ( ) cm-1 depending on solvent polarity and the transitions between molecular energy levels in each solvent of Rhodamine B dye .

A phthalocyanine-based fluorescent sensor for Zn2+ ion

2013 ◽  
Vol 17 (01n02) ◽  
pp. 99-103 ◽  
Author(s):  
Hui He ◽  
Jian-Yong Liu ◽  
Dennis K.P. Ng
Keyword(s):  
Metal Ions ◽  
Spectral Properties ◽  
Fluorescence Spectra ◽  
Near Infrared ◽  
Fluorescent Sensor ◽  
High Sensitivity ◽  
Absorption And Fluorescence Spectra

This paper describes the preparation and spectral properties of a near-infrared fluorophore in which two bis(2-picolyl)amino moieties are axially linked to a silicon(IV) phthalocyanine core. The effects of various metal ions on its absorption and fluorescence spectra have been examined. The results indicate that this compound shows a high sensitivity and moderate selectivity toward Zn2+ ion.

Influence of Si-Al-Ge-Sb Matricies on Tm3+ Excitation Levels

2008 ◽  
Vol 587-588 ◽  
pp. 293-297
Author(s):  
M. Pospíšilová ◽  
P. Adámek ◽  
P. Peterka ◽  
V. Kubeček ◽  
I. Kašík ◽  
...  
Keyword(s):  
Genetic Algorithm ◽  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Fluorescence Spectra ◽  
Chemical Vapor ◽  
Oscillator Strengths ◽  
Absorption And Fluorescence Spectra ◽  
Measured Absorption ◽  
Optical Fiber Drawing ◽  
Solution Doping

Absorption and fluorescence spectra in the range from 350 to 1750 nm of several Tm3+- doped optical performs (rods) for optical fiber drawing were measured. Silica-based matrices of Al2O3-GeO2-P2O5-Sb2O3-SiO2 composition doped with several thousands ppm of Tm3+ were characterized. The preforms were fabricated by the Modified Chemical Vapor Deposition and by the solution doping methods. A new method, Genetic Algorithm SPEctra Decomposition was adopted for processing of the measured absorption spectra. This decomposition made it possible to calculate the oscillator strengths of Tm3+ absorption levels. Fluorescence bands of Tm3+ at 800 nm or 1640 nm were found in fluorescence spectra measured on the preform samples when excited at 1064 nm only.

Development of temporal spectroscopic properties for Xerogel matrices doped with Rhodamine 6G dye

Open Physics ◽  
2006 ◽  
Vol 4 (3) ◽  
Author(s):  
Abbas Al-Wattar ◽  
Baha Chiad ◽  
Wesam Twej ◽  
Sarmed Al-Awadi
Keyword(s):  
Fluorescence Spectra ◽  
Rhodamine 6G ◽  
Sol Gel ◽  
Blue Shift ◽  
Spectroscopic Properties ◽  
Dye Molecules ◽  
Absorption And Fluorescence Spectra ◽  
Silica Network ◽  
Sol Gel Process ◽  
Two Parameters

AbstractThe solid host of a laser dye modifies its spectroscopic properties with respect to its liquid host. During the Sol-Gel process the dye molecules suffer from changing their environment. Two parameters affect this matter, the change in the concentration due to the evaporation of the solvent (drying) and the caging of dye molecules inside the pores or attachment to the silica network. Rhodamine 6G absorption and fluorescence spectra with different concentrations, during Sol-Gel time processing, have been studied. Both, absorption and fluorescence spectra of the dye in the solid host, for different concentrations, show a blue-shift relative to its liquid phase.

Molecular Vibrations in the Exciton Theory for Molecular Aggregates. II. Dimeric Systems

1961 ◽  
Vol 14 (3) ◽  
pp. 344 ◽  
Author(s):  
EG McRae
Keyword(s):  
Absorption Spectrum ◽  
Perturbation Theory ◽  
Fluorescence Spectra ◽  
Numerical Calculations ◽  
Molecular Vibrations ◽  
Molecular Aggregates ◽  
Absorption And Fluorescence Spectra ◽  
Band Structures ◽  
Electronic Band ◽  
Electronic Band Structures

The theory of Part I of this series (McRae 1961) is developed in detail for dimeric systems. The simplest possible theory of the exciton states for a system of two non-rigid molecules is obtained through the use of perturbation theory. The theory makes possible the prediction of electronic band structures in absorption and fluorescence spectra as functions of the theoretical Davydov splitting for two rigid molecules. Numerical calculations are made for a dimer of a typical dye, and the results are compared with the observed absorption spectrum of the 1,1'-diethyl-2,2'-pyridocyanine iodide dimer.

Sign in / Sign up

Export Citation Format

Share Document