Mechanism of Nonphotochemical Quenching in Green Plants:  Energies of the Lowest Excited Singlet States of Violaxanthin and Zeaxanthin†

Biochemistry ◽  
2000 ◽  
Vol 39 (11) ◽  
pp. 2831-2837 ◽  
Author(s):  
Harry A. Frank ◽  
James A. Bautista ◽  
Jesusa S. Josue ◽  
Andrew J. Young
Keyword(s):  
Nonphotochemical Quenching ◽  
Excited Singlet ◽  
Green Plants ◽  
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.

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