Open AccessELECTRON-PHONON INTERACTION AND NONLINEAR OPTICAL SUSCEPTIBILITY OF POLYMER
Author(s) -
Ruigang Fu,
Lie-Ming Li,
Sun X,
Ruigang Fu
Publication year - 1993
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.42.422
Subject(s) - excited state , excitation , phonon , physics , atomic orbital , condensed matter physics , interpretation (philosophy) , electron , nonlinear system , polyacetylene , materials science , atomic physics , quantum mechanics , doping , computer science , programming language
The third harmonic generation spectrum (THG) of trans-polyacetylene exhibits two peaks at 0.6eV and 0.9 eV respectively. None of the existing theories can give a quantitatively satis-factory interpretation. By considering properly the excitation-dependent damping, we can get the second peak at 0.9eV. The damping of excited states that we depict in this paper due to electron-phonon interaction of polymer varies with the excited states. According to this dam-ping, the theoretical results of THG agree with the observed spectrum very well.