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Full Screen- TITLE
- DEDICATION
- CERTIFICATE
- DECLARATION
- ACKNOWLEDGEMENT
- CONTENTS
- PREFACE
- 1. PROPERTIES OF ORGANIC DYES
- 1.1 Introduction
- Fig.1.1 Tuning Range of Various Classes of Organic Dyes
- 1.2 Energy Levels of a Typical Dye Molecule
- Fig.1.2 Schematic diagram of the energy levels of a typical dye Molecule
- 1.3 Absorption and Emission Spectrum
- 1.4 Pumping of Dye Lasers
- 1.5 Interaction of Laser Radiations with Organic Dyes
- 1.6 Effect of Triplet State
- 1.7 Non-Radiative Processes
- 1.8 Internal Conversion
- 1.9 Stability of Dyes - Temperature Dependence
- 1.10 Wavelength Limits
- 1.11 Environmental Effects
- 1.11.1. Influence of solvent
- 1.11 2 Aggregation of dye molecules
- 1. 11 3 Excited state reactions
- 1. 11 4 Fluorescence quenching by energy transfer
- 1.12 Hydrogen Vibrations
- 1.13 Other Intramolecular Quenching Processes
- 1.14 Twisted Intramolecular Charge Transfer (TICT)
- References
- 2. KINETIC ANALYSIS OF PHOTOQUENCHING MECHANISM IN DYE MOLECULES
- 2.1 Introduction
- 2.2 Kinetic Analysis
- 2.2.1 General considerations
- 2.2.2 Fluorescence quantum yield
- 2.3 Dependence of Fluorescence Yield on Molecular Parameters
- 2.4 Evaluation of Lifetime of 7D4MC
- Fig.2.3 Variation of Reciprocal Relative Quantunl Yield with Intensity
- 2.5 Dependence of Fluorescence Yield on Exciting Pulse Duration
- 2.6 Interaction of Picosecond Laser Pulses with Rhodamine 6G
- Fig.2.5 Variation of Fractional Quenching with Incident Laser Intensity
- 2.7 Quantitative Analysis of Competitive Processes in 7D4MC and Rhodamine 6G
- 2.8 Conclusions
- References
- 3. PHOTOQUENCHING IN RIGID AND NON-RIGID DYE MOLECULES
- 3.1 Introduction
- 3.2 Molecular Structures of F DS and CV
- 3.3 Pump Power Dependence of Gain
- Fig.3.2 Block Diagram of the Experimental Arrangement
- 3.4 Temporal Dependence of Gain
- 3.5 Dependence of Gain on Pump Intensity
- 3.6 Dependence of Efficiency on Pump Power
- 3.7 Fluorescence Properties of CV and FDS
- 3.8 Conclusions
- References
- 4. ENERGY TRANSFER MECHANISM IN BINARY DYE SYSTEMS
- 4.1 Introduction
- 4.2 Excitation Transfer Mechanisms
- 4.3 Theoretical Considerations
- 4.4 Experimental
- 4.5 Results and Discussion
- 4.6 Energy Transfer and Optical Gain Studies in SF-RhB Dye Mixture
- 4.6.1 Dependence of peak fluorescence intensity of the donor and acceptor on acceptor concentration
- 4.6.2 Pump power dependence on emission intensity
- 4.6.3 Dependence of peak wavelength of the donor and acceptor emission on acceptor concentration
- 4.6.4 Nature of energy transfer and probability function
- 4.6.5 Energy transfer efficiency and rate constants
- 4.6.6 Effective fluorescence line width of the acceptor
- 4.6.7 Emission cross section of the acceptor
- 4.6.8 Dependence of gain on [A] and pump power
- 4.7 Energy Transfer and Optical Gain Studies in SF-CV Dye Mixture
- 4.7.1 Dependence of the peak fluorescence intensity of the donor and acceptor on acceptor concentration
- 4.7.2 Pump power dependence on emission intensity
- 4.7.3 Dependence of the peak wavelength of the donor and acceptor on acceptor concentration
- 4.7.4 Nature of transfer probability function
- 4.7.5 Variation of transfer efficiency with acceptor concentration and energy transfer rate constant
- 4.7.6 Dependence of gain on [A] and pump power
- 4.8 Conclusions
- References
- 5. ENERGY TRANSFER MECHANISM IN TERNARY DYE MIXTURE
- 5.1 Introduction
- 5.2 Theoretical Considerations
- 5.3 Experimental
- 5.4 Results and Discussion
- 5.4.1 Peak emission wavelengths
- 5.4.2 Probability of energy transfer
- 5.4.3 Energy transfer efficiency
- 5.4.4 Study of effective fluorescence line widths
- 5.4.5 Emission cross section
- 5.4.6 Dependence of optical gain on concentrations of the acceptor and pump power
- 5.4.7 Optical parameters of energy transfer
- 5.5 Conclusions
- References
- APPENDIX A kINETICS AND MECHANISM
- APPENDIX B