Low temperature optical spectroscopy of natural porphyrins

Low temperature hole burning excitation fluorescence spectra of a set of uroporphyrin I esters in amorphous (chloroform) matrix are presented. The hole burning spectra were excited within the region of the O-O S 1 → S 0 transition and measured in the temperature range 1.5 – 4.3 K. From the fluence t...

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Bibliographic Details
Published in:Journal of molecular structure 1993, Vol.293, p.177-180
Main Authors: Dian, J., Adamec, F., Ambrož, M., Pšenčik, J., Vácha, M., Hála, J.
Format: Article
Language:English
Subjects:
Biological and medical sciences
Fundamental and applied biological sciences. Psychology
Molecular biophysics
Spectroscopy : techniques and spectras
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Summary:Low temperature hole burning excitation fluorescence spectra of a set of uroporphyrin I esters in amorphous (chloroform) matrix are presented. The hole burning spectra were excited within the region of the O-O S 1 → S 0 transition and measured in the temperature range 1.5 – 4.3 K. From the fluence the values of homogeneous linewidths were determined. The temperature dependence of the holewidth δ HB has been studied. The temperature dependence of δ HB follows the power law T α and coefficients α for uroporphyrin I esters are within the range 1.32 – 1.36, which is in good agreement with other results obtained for systems in amorphous matrices. The fluorescence lifetime values of Γ hom and zerotemperature extrapolated values are compared.
ISSN:0022-2860
1872-8014
DOI:10.1016/0022-2860(93)80043-U