B896 AND B870 COMPONENTS OF THE RHODOBACTER-SPHAEROIDES ANTENNA - A HOLE BURNING STUDY

被引:158
作者
REDDY, NRS
PICOREL, R
SMALL, GJ
机构
[1] IOWA STATE UNIV SCI & TECHNOL, US DOE, AMES LAB, AMES, IA 50011 USA
[2] IOWA STATE UNIV SCI & TECHNOL, DEPT CHEM, AMES, IA 50011 USA
[3] CSIC, EE AULA DEI, E-50080 ZARAGOZA, SPAIN
关键词
D O I
10.1021/j100194a065
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Novel nonphotochemical hole burning action spectra are persented that yield the low-temperature absorption profiles of B896 and B870 and their underlying structures (linear electron-phonon coupling and site inhomogeneous broadening). The results establish that B896 and B870 are associated with the far more intense B875 and B850 bacteriochlorophyll a absorption bands, respectively, of the light harvesting I and II complexes. The homogeneous widths of the B896 and B870 zero-phonon holes are the same within experimental uncertainty, 3.2 cm-1 at 4.2 K, which corresponds to a total optical dephasing time of 6.6 ps. A number of interpretations for B870 and B896 are considered. Favored is one in which they are due to the lowest energy levels of the B850* and B875* exciton bands (asterisk denoting the S1(Q(y)) state). Based on studies of the dephasing of excitons in organic crystals, the 6.6-ps dephasing of B896* is attributed to exciton scattering with energetic inequivalent neighboring unit cells. Such scattering and B870 to B875 energy transfer are suggested to be contributors to the dephasing of B870*. The effect of glasslike structural heterogeneity on the optical selection rules for unit cells of cyclic symmetry is also considered.
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页码:6458 / 6464
页数:7
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