scholarly journals Singlet fission from upper excited singlet states and polaron formation in rubrene film

RSC Advances ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 4639-4645
Author(s):  
Tong Wu ◽  
Wenjun Ni ◽  
Gagik G. Gurzadyan ◽  
Licheng Sun
Keyword(s):  
Transient Absorption ◽  
Electronic States ◽  
Relaxation Dynamics ◽  
Singlet Fission ◽  
Excited Singlet ◽  
Pump Probe ◽  
Singlet States ◽  
Excited Singlet States ◽  
Polaron Formation

Femtosecond fluorescence up-conversion and transient absorption pump-probe setups are applied to study the relaxation dynamics of the lower and upper excited singlet electronic states in easy-to-make rubrene films.

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.

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