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Infrared-to-Visible Upconversion in Erbium Pentaphosphate

100%
Kaczmarek F., Balicki M., Karolczak J.
Acta Physica Polonica A
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1993
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vol. 83
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issue 6
831-836
EN
Infrared-to-visible upconversion has been observed by many authors in a variety of rare-earth-doped crystals. This paper reports the study of the up-conversion found in stoichiometric erbium pentaphosphate, ErP_{5}O_{1}4. Strong green fluorescence was observed upon pumping the crystal with a cw diode laser at a wavelength of about 800 nm.
2
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Influence of Silver Colloid on Fluorescein Spectral Properties

100%
Frąckowiak D., Balter A., Karolczak J., Siejak P.
Acta Physica Polonica A
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2006
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vol. 110
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issue 4
451-458
EN
In order to check if the observed earlier changes in fluorescence intensities of fluorescein solution due to the addition of colloidal suspension of silver are related to the generation of surface plasmon coupled emission, the steady state photothermal spectra and fluorescence decay times of such samples were measured. The Gaussian components of photoacoustic spectra for solutions with and without silver colloid addition were determined and compared with components of absorption and fluorescence excitation spectra of the same samples. The efficiencies of thermal and radiative deactivation of various samples were discussed. The fluorescence decay times measured at the wavelength of excitation not exhibiting the increase in photonic mode density depend only on the dye concentration. Decays exhibit changes as a result of silver addition with excitation in the region in which enhancement of fluorescence is observed. These changes are due not only to the change in the fluorescence yield generated by interactions with plasmons but also to those in thermal deactivation of the sample related to the colloid presence.
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Primary Electron Transfer Reactions in Membrane-Bound Open and Closed Reaction Centers from Purple Bacterium Rhodobacter sphaeroides

76%
Gibasiewicz K., Pajzderska M., Karolczak J., Burdziński G., Dobek A., Jones M.
Acta Physica Polonica A
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2012
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vol. 122
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issue 2
263-268
EN
Most ultrafast transient absorption studies of primary electron transfer in reaction centers from purple bacteria have been performed in complexes isolated from their natural lipid membrane environment using detergent. In this contribution we present near-UV-vis transient absorption studies of reaction centers embedded in their natural membrane environment. The evolution of absorption spectra recorded with subpicosecond resolution and reflecting primarily electron transfer reactions has been compared to data obtained previously for isolated reaction centers. We conclude that the overall spectral evolution in both types of samples is similar, and the environment of the reaction center protein has only a minor effect on the primary electron transfer reactions. The differences between the two samples are explained in terms of different energetic levels (and their different temporal evolution) of the two initial charge separated states P^+B_A^- and P^+H_A^-, with P being the primary electron donor and B_A and H_A the two consecutive electron acceptors. Additionally, in the electric field generated by P^+H_A^-, B_A in membrane-bound reaction centers undergoes a stronger electrochromic shift than in isolated reaction centers.
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