Molecular probing of low-temperature incommensurate phases

Biological Systems at Low Temperatures

Автор(и)

  • J. Kikas Institute of Materials Science, University of Tartu, 4 Tähe, Tartu 51010, Estonia
  • A. Suisalu Institute of Physics, University of Tartu, 142 Riia, Tartu 51014, Estonia
  • A. Laisaar Institute of Physics, University of Tartu, 142 Riia, Tartu 51014, Estonia
  • An. Kuznetsov Institute of Physics, University of Tartu, 142 Riia, Tartu 51014, Estonia

DOI:

https://doi.org/10.1063/1.1614197

Ключові слова:

PACS: 61.44.Fw, 62.50. p, 64.70.Rh, 78.55.Kz

Анотація

Two-dimensional (2D) excitation-emission spectra of biphenyl doped with free-base chlorin were measured at 5 K under various pressures up to 350 MPa. Besides the features related to zero-phonon lines and their phonon sidebands, a broad spectral band amounting to 80% of the total intensity at 5 K was revealed in the 2D spectra. The obtained inhomogeneous distribution function shows drastic changes with increasing pressure — the triplet structure observable at normal pressure in the incommensurate phase ICIII of biphenyl converges to a singlet in the high-pressure commensurate phase CI. These observations are assumed to reflect specific for incommensurate phases relaxation after an optical excitation of probe molecules and interaction of them with the incommensurate modulation wave.

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Опубліковано

2003-09-01

Як цитувати

(1)
Kikas, J.; Suisalu, A.; Laisaar, A.; Kuznetsov, A. Molecular Probing of Low-Temperature Incommensurate Phases: Biological Systems at Low Temperatures. Fiz. Nizk. Temp. 2003, 29, 1057-1060.

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