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Volumn 109, Issue 16, 1998, Pages 6916-6928

Pump-probe spectra of linear molecular aggregates: Effect of exciton-exciton interaction and higher molecular levels

Author keywords

[No Author keywords available]

Indexed keywords

BOUNDARY CONDITIONS; EIGENVALUES AND EIGENFUNCTIONS; ELECTRONIC PROPERTIES; FERMI LEVEL; GREEN'S FUNCTION; LIGHT POLARIZATION; MOLECULAR DYNAMICS; MOLECULAR VIBRATIONS; SPECTRUM ANALYSIS;

EID: 0032558570     PISSN: 00219606     EISSN: None     Source Type: Journal    
DOI: 10.1063/1.477259     Document Type: Article
Times cited : (11)

References (60)
  • 1
    • 0002810705 scopus 로고
    • in edited by L. Augenstein, R. Mason, and B. Rosenberg Academic, New York
    • E. G. McRae and M. Kasha, in Physical Processes in Radiation Biology, edited by L. Augenstein, R. Mason, and B. Rosenberg (Academic, New York, 1964), p. 23.
    • (1964) Physical Processes in Radiation Biology , pp. 23
    • McRae, E.G.1    Kasha, M.2
  • 10
    • 22244470331 scopus 로고
    • G. Juzeliūnas, Liet. Fiz. Rink. 27, 261 (1987) [English translation, Sov. Phys. Collect. 27, 7 (1987)].
    • (1987) Sov. Phys. Collect. , vol.27 , pp. 7
    • Juzeliunas1
  • 41
    • 0000329706 scopus 로고    scopus 로고
    • in edited by T. Kobayashi World Scientific, Singapore
    • J. Knoester and F. C. Spano, in J-Aggregates, edited by T. Kobayashi (World Scientific, Singapore, 1996), p. 111.
    • (1996) J-Aggregates , pp. 111
    • Knoester, J.1    Spano, F.C.2
  • 45
    • 22244440152 scopus 로고    scopus 로고
    • note
    • The quantity N may not necessarily represent the physical size of the aggregate, but the coherence length of an exciton in an aggregate, as mentioned earlier (Ref. 10).
  • 54
    • 22244484020 scopus 로고    scopus 로고
    • note
    • Yet the present situation is somewhat different from that featured in the theory of biphonons and Fermi resonance (Ref. 47), as excitons and phonons are particles obeying different statistics. Specifically, phonons are bonons while excitons are quasiparticles obeying Pauli-statistics. It is the Pauli statistics of the excitons, which is responsible for the blue shift of the exciton absorption line around the exciton band-edge (Refs. 9, 10, 12 13 14, 24). Furthermore, the theory of Fermi-resonance in crystals (Ref. 47) is normally restricted to a single molecular vibration with higher frequency; this corresponds to inclusion of only one higher molecular level in our case.
  • 57
    • 22244475355 scopus 로고    scopus 로고
    • note
    • In this discussion, it is implicitly assumed that L>0, where -L is the energy of the resonant coupling between the Fermi-excitons. In such a case, the optically allowed transitions take place to the levels situated at the bottom of the exciton band.
  • 58
    • 22244434569 scopus 로고    scopus 로고
    • note
    • A similar conclusion has been reached by Knoester and Spano (Ref. 15) in their analysis of the two-photon absorption by a chain of three level molecules in the absence of the direct interaction between the excitons (γ=0). Specifically, it was concluded that "the two-photon allowed space splits into a chain of length of N-2 and a 'dimer' subspace" in the case where the coupling between the excitons and the higher molecular levels exceed considerably the magnitude of the resonance interaction. In the presented situation [Figs. 1(a) and 2] the coupling between the two subsystems is not so strong, yet an additional indirect attraction between the excitons leads to a similar effect. It is to be pointed out that in calculating Figs. 1(a), 2, and 3, the spectral width of higher molecular levels is taken to be very narrow Δ/2L≪1. Such a situation is similar to the model of the three-level molecular chain in which the exciton-exciton interaction is now additionally included.
  • 59
    • 22244444111 scopus 로고    scopus 로고
    • note
    • eff.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.