Absorption and Fluorescence Spectra of Light-Harvesting Bacteriochlorophyll-Protein Complexes from Rhodopseudomonas palustris in the Near-Infrared Region1

1982 ◽  
Vol 91 (3) ◽  
pp. 1017-1027 ◽  
Author(s):  
Hidenori HAYASHI ◽  
Mitsue MIYAO ◽  
Sigehiro MORITA
Keyword(s):  
Fluorescence Spectra ◽  
Near Infrared ◽  
Light Harvesting ◽  
Protein Complexes ◽  
Rhodopseudomonas Palustris ◽  
Absorption And Fluorescence Spectra

A phthalocyanine-based fluorescent sensor for Zn2+ ion

2013 ◽  
Vol 17 (01n02) ◽  
pp. 99-103 ◽  
Author(s):  
Hui He ◽  
Jian-Yong Liu ◽  
Dennis K.P. Ng
Keyword(s):  
Metal Ions ◽  
Spectral Properties ◽  
Fluorescence Spectra ◽  
Near Infrared ◽  
Fluorescent Sensor ◽  
High Sensitivity ◽  
Absorption And Fluorescence Spectra

This paper describes the preparation and spectral properties of a near-infrared fluorophore in which two bis(2-picolyl)amino moieties are axially linked to a silicon(IV) phthalocyanine core. The effects of various metal ions on its absorption and fluorescence spectra have been examined. The results indicate that this compound shows a high sensitivity and moderate selectivity toward Zn2+ ion.

scholarly journals Modeling the optical properties of excitons in linear and tubular J-aggregates

2006 ◽  
Vol 2006 ◽  
pp. 1-10 ◽  
Author(s):  
Jasper Knoester
Keyword(s):  
Optical Properties ◽  
Fluorescence Spectra ◽  
Light Harvesting ◽  
Cyanine Dyes ◽  
Natural Light ◽  
Artificial Light ◽  
Absorption And Fluorescence Spectra ◽  
Harvesting Systems ◽  
J Aggregates ◽  
Frenkel Excitons

The theory of the optical properties of linear and tubular molecular J-aggregates is reviewed. The primary optical excitations in these systems are Frenkel excitons, which may be delocalized over many molecules. The collective nature of these excitations gives rise to special optical properties and dynamics, which are of interest for purely scientific reasons, but also enable the application of J-aggregates as photographic sensitizers and artificial light-harvesting systems. The focus of this paper is on the effect of aggregate geometry, disorder, and temperature on the absorption and fluorescence spectra. Also transport of excitations between J-aggregates is discussed. Connection is made to experiments on aggregates of cyanine dyes and natural light-harvesting systems.

Derivative Absorption Spectroscopy of the Pigment-Protein Complexes from Rhodopseudomonas capsulata

1980 ◽  
Vol 35 (9-10) ◽  
pp. 722-725 ◽  
Author(s):  
Gerhard Talsky ◽  
Comelis P. Rygersberg ◽  
Rien van Grondelle ◽  
Reiner Feick ◽  
Gerhart Drews
Keyword(s):  
Absorption Spectra ◽  
Protein Complex ◽  
Near Infrared ◽  
Light Harvesting ◽  
Protein Complexes ◽  
Molecular Organization ◽  
Rhodopseudomonas Capsulata ◽  
Absorption Bands ◽  
Pigment Protein Complexes ◽  
Pigment Protein Complex

Abstract The near infrared absorption spectra and their fourth derivative were measured in membrane preparations or in the isolated light harvesting pigment-protein complex B 800-850 from Rhodopseudomonas capsulata in order to know how the underlying molecular absorption spectra contribute to the observed absorption curve. In contrast to the observations of Cogdell and Crofts [Biochim. Biophys. Acta 502, 409 (1978)] no splitting of the 855 nm absorption bands was observed at 300 K, 100 K, and 4 K. However, a small but significant splitting of the 870 nm band in all derivates (2nd, 4th, 6th) was observed at 300 K and 4 K. The lack of splitting of the 855 nm absorption band will be discussed in the light of the molecular organization of the B 855 moiety of this light harvesting bacteriochlorophyll-protein complex.

Influence of Si-Al-Ge-Sb Matricies on Tm3+ Excitation Levels

2008 ◽  
Vol 587-588 ◽  
pp. 293-297
Author(s):  
M. Pospíšilová ◽  
P. Adámek ◽  
P. Peterka ◽  
V. Kubeček ◽  
I. Kašík ◽  
...  
Keyword(s):  
Genetic Algorithm ◽  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Fluorescence Spectra ◽  
Chemical Vapor ◽  
Oscillator Strengths ◽  
Absorption And Fluorescence Spectra ◽  
Measured Absorption ◽  
Optical Fiber Drawing ◽  
Solution Doping

Absorption and fluorescence spectra in the range from 350 to 1750 nm of several Tm3+- doped optical performs (rods) for optical fiber drawing were measured. Silica-based matrices of Al2O3-GeO2-P2O5-Sb2O3-SiO2 composition doped with several thousands ppm of Tm3+ were characterized. The preforms were fabricated by the Modified Chemical Vapor Deposition and by the solution doping methods. A new method, Genetic Algorithm SPEctra Decomposition was adopted for processing of the measured absorption spectra. This decomposition made it possible to calculate the oscillator strengths of Tm3+ absorption levels. Fluorescence bands of Tm3+ at 800 nm or 1640 nm were found in fluorescence spectra measured on the preform samples when excited at 1064 nm only.

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