THE LUMINESCENCE OF COMPLEX MOLECULES IN RELATION TO THE INTERNAL CONVERSION OF EXCITATION ENERGY: PART II. N-HETEROAROMATICS

1960 ◽  
Vol 38 (2) ◽  
pp. 233-239 ◽  
Author(s):  
Robin M. Hochstrasser
Keyword(s):  
Excitation Energy ◽  
Internal Conversion ◽  
Absolute Ethanol ◽  
Exciting Light ◽  
Excited Singlet ◽  
Complex Molecules ◽  
Heavy Atoms ◽  
Singlet States ◽  
Energy Part ◽  
Excited Singlet States

The relative fluorescence and/or phosphorescence yields of a number of methyl- and halogeno-quinolines, isoquinolines, and acridines have been measured as a function of the wavelength of the exciting light. In all cases the solvent was absolute ethanol. The results show that the efficiency of internal conversion processes between excited singlet states is extremely high in comparison to other intramolecular steps. The effect of substituted heavy atoms is discussed, as well as the fluorescence of the conjugate acids of the bases.

THE LUMINESCENCE OF COMPLEX MOLECULES IN RELATION TO THE INTERNAL CONVERSION OF EXCITATION ENERGY. PART I

1959 ◽  
Vol 37 (8) ◽  
pp. 1367-1372 ◽  
Author(s):  
Robin M. Hochstrasser
Keyword(s):  
Excited State ◽  
Internal Conversion ◽  
Exciting Light ◽  
Intramolecular Energy Transfer ◽  
Excited Singlet ◽  
Complex Molecules ◽  
Transfer Processes ◽  
Singlet States ◽  
Energy Part ◽  
Excited Singlet States

The relative fluorescence yields of a variety of double molecules have been measured as a function of the wavelength of exciting light. In some cases the yield from the second excited state is lower than from the first. This effect is attributed to either photodecomposition or to the enhancement of intramolecular energy transfer processes which can compete with the internal conversion between the excited singlet states. The experiments on bianthrone have suggested a method of elucidating the mechanism of the photochromic isomerization of this compound.

The role of the molecular environment for the primary photoprocesses of phenol in solution

1980 ◽  
Vol 58 (19) ◽  
pp. 2006-2010 ◽  
Author(s):  
J. Zechner ◽  
G. Köhler ◽  
G. Grabner ◽  
N. Getoff
Keyword(s):  
Excitation Energy ◽  
Quantum Yields ◽  
Strongly Correlated ◽  
Solvated Electron ◽  
Excited Singlet ◽  
Solvent Interactions ◽  
Singlet States ◽  
Excited Singlet States

Quantum yields of fluorescence as well as of solvated electron and H atom formation have been measured for phenol in several pure solvents and mixtures of varying polarity. The influence of excitation energy has been studied by excitation of phenol in the first and second excited singlet states. The solvent dependences of fluorescence and photoejection parameters are strongly correlated. The results are interpreted in terms of specific solute–solvent interactions, in particular H-bonded structures.

Internal conversion from the lowest excited singlet states of aromatic hydrocarbons

1971 ◽  
Vol 11 (4) ◽  
pp. 472-473 ◽  
Author(s):  
A. Kearvell ◽  
F. Wilkinson
Keyword(s):  
Aromatic Hydrocarbons ◽  
Internal Conversion ◽  
Excited Singlet ◽  
Singlet States ◽  
Excited Singlet States

scholarly journals Ultrafast Decay of the Excited Singlet States of Thioxanthone by Internal Conversion and Intersystem Crossing

ChemPhysChem ◽  
2010 ◽  
Vol 11 (2) ◽  
pp. 480-488 ◽  
Author(s):  
Gonzalo Angulo ◽  
Jakob Grilj ◽  
Eric Vauthey ◽  
Luis Serrano-Andrés ◽  
Òscar Rubio-Pons ◽  
...  
Keyword(s):  
Internal Conversion ◽  
Intersystem Crossing ◽  
Excited Singlet ◽  
Singlet States ◽  
Excited Singlet States

Quasiparticle Excitations in Polyenes and Polyacetylene

1987 ◽  
Vol 109 ◽  
Author(s):  
Paul Tavan ◽  
Klaus Schulten
Keyword(s):  
Dispersion Relations ◽  
Excited Singlet ◽  
Quasi Particle ◽  
Double Excitation ◽  
Singlet States ◽  
Excited Singlet States ◽  
Electron Excitations ◽  
Quasiparticle Excitations

ABSTRACTWe apply the Pariser-Parr-Pople Hamiltonian to study many-electron excitations in polyenes and polyacetylene. The excited singlet states of polyenes, calculated by a multireference double excitation expansion, are classified as quasi-particle excitations, namely as triplet-triplet magnons and particle-hole excitons. From finite polyene spectra we derive approximate dispersion relations for these quasi-particles in the infinite polyene, i.e. polyacetylene.

Photostability of 9H-adenine: mechanisms of the radiationless deactivation of the lowest excited singlet states

2005 ◽  
Vol 313 (1-3) ◽  
pp. 107-112 ◽  
Author(s):  
S. Perun ◽  
A.L. Sobolewski ◽  
W. Domcke
Keyword(s):  
Excited Singlet ◽  
Singlet States ◽  
Excited Singlet States
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