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Tytuł:
Absorption Spectroscopy as a Probe of the Structure of Polyaminocarboxylate-Eu(III) Complexes in Solution
Autorzy:
Mondry, A.
Riehl, J. P.
Powiązania:
https://bibliotekanauki.pl/articles/1929802.pdf
Data publikacji:
1993-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.Wc
78.55.Hx
Opis:
Absorption spectroscopy was used to study the aqueous solution structure of Eu(III) complexes with DTPA (diethylenetriaminepentaacetic acid) and TTHA (triethylenetetraaminehexaacetic acid). Analysis of the oscillator strengths of the 4f ↔ 4f transitions and of the Judd-Ofelt intensity parameters, τ$\text{}_{λ}$, was performed in order to investigate the formation and the type of bonding in Eu(III)-DTPA and Eu(III)-TTHA species occurring in solution. The correlation of these results with those from other methods made it possible to suggest a relatively complete model of Eu(III)-polyaminocarboxylate coordination.
Źródło:
Acta Physica Polonica A; 1993, 84, 5; 969-974
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
X-Ray Absorption Spectroscopy
Autorzy:
Mobilio, S.
Powiązania:
https://bibliotekanauki.pl/articles/1931690.pdf
Data publikacji:
1994-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.85.+n
78.70.Dm
Opis:
X-ray absorption spectroscopy, today widely used as a tool for structural investigations, is described. Theoretically it is shown that above an absorption edge the absorption coefficient is well approximated by a sum of terms, each one describing a particular path followed by the photoelectron outgoing from the atom. Such geometrical feature allows to use X-ray absorption spectroscopy for structural investigations. The data analysis procedures are outlined. Applications of the single scattering region, generally known as EXAFS to semiconductors alloys, to metallic clusters and to the crystallization of amorphous metallic glasses are illustrated. Multiple scattering calculations and their relation to experimental spectra is discussed in the case of Mn ions in solution. Application of the multiple scattering to determine the three-body correlation function in a-Si:H is shown.
Źródło:
Acta Physica Polonica A; 1994, 86, 5; 645-661
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calorimetric Absorption Spectroscopy of Deep Defects and Quantum Dots
Autorzy:
Heitz, R.
Podlowski, L.
Böhrer, J.
Hoffmann, A.
Broser, I.
Bimberg, D.
Powiązania:
https://bibliotekanauki.pl/articles/1933692.pdf
Data publikacji:
1995-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Eq
73.20.Dx
71.70.Gm
Opis:
In recent years calorimetric absorption spectroscopy has been developed to a powerful tool of semiconductor spectroscopy based on the detection of nonradiative relaxation processes. Calorimetric absorption spectroscopy is an ultrasensitive quantitative absorption technique. Recent investigations of Fe in III-V semiconductors and of InAs/GaAs quantum dots are presented here to illustrate the potential of the method. Sharp absorption lines are observed at the low energy onset of the Fe $\text{}^{3+}\text{}^{/}\text{}^{2+}$ charge transfer band in III-V semiconductors. Calorimetric absorption spectroscopy measurements in the mK range reveal a strong temperature dependence of their absorption strength identifying unambiguously Fe$\text{}^{3+}$($\text{}^{6}$A$\text{}_{1}$(S)) as a ground state. The excited state is attributed to (Fe$\text{}^{2+}$,h). The importance of exchange interaction for the observed fine structure is pointed out and binding energies are determined. The quantum yield of the intracenter $\text{}^{5}$Τ$\text{}_{2}$-$\text{}^{5}$E transition of F$\text{}^{2+}$ is determined to be below 50% at 2 K. A correlation between the nonradiative relaxation rate and the isotope splitting of the $\text{}^{5}$Τ$\text{}_{2}$-$\text{}^{5}$E transition is observed, demonstrating the crucial role of the dynamical Jahn-Teller coupling of the $\text{}^{5}$Τ$\text{}_{2}$ state to local Τ$\text{}_{2}$ modes for the multiphonon relaxation process. Quantum dots having a d-function density of states should exhibit no Stokes shift between absorption and emission as observed for one- and two-dimensional systems. Calorimetric absorption spectroscopy demonstrates ground state absorption coinciding in energy with the luminescence for self- organized InAs/GaAs quantum dot structures grown by MBE. Transitions into excited hole states are resolved and a comparison to photoluminescence excitation spectroscopy is presented.
Źródło:
Acta Physica Polonica A; 1995, 88, 4; 619-630
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface X-Ray Absorption Spectroscopy: Basic Concepts and Applications
Autorzy:
Lagarde, P.
Powiązania:
https://bibliotekanauki.pl/articles/1963303.pdf
Data publikacji:
1997-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.35.Gy
78.70.Dm
Opis:
The application to surface problems of X-ray spectroscopy has started almost at the same time as in materials science. While the theoretical basis is obviously the same, SEXAFS has some experimental peculiarities which are reviewed here. Some examples will then be given.
Źródło:
Acta Physica Polonica A; 1997, 91, 4; 641-647
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The incorporation of various porphyrins into blood cells measured via flow cytometry, absorption and emission spectroscopy
Autorzy:
Ion, Rodica-Mariana
Planner, Alfons
Wiktorowicz, Krzysztof
Frąckowiak, Danuta
Powiązania:
https://bibliotekanauki.pl/articles/1044798.pdf
Data publikacji:
1998
Wydawca:
Polskie Towarzystwo Biochemiczne
Źródło:
Acta Biochimica Polonica; 1998, 45, 3; 833-845
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectroscopy and Photophysics of Monoazaphenanthrenes I. Absorption and Fluorescence Spectra of Phenanthridine and 7,8-Benzoquinoline
Autorzy:
Norek, M.
Dresner, J.
Prochorow, J.
Powiązania:
https://bibliotekanauki.pl/articles/2036981.pdf
Data publikacji:
2003-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.20.Lg
33.50.Dq
33.70.-w
Opis:
The absorption and fluorescence spectra of phenaentridine and 7,8-benzoquinoline have been measured in liquid solutions of non-polar, aprotic hydrocarbon solvents (n-hexane and cyclohexane) and in strongly polar (and hydrogen-bonding) methanol. The analysis of the Stokes' shift between absorption and fluorescence spectra has shown that for both molecules the observed solvent effects on their absorption and fluorescence spectra can be described in terms of universal solvent-solute interactions (no evidence of specific solvent-solute interactions, of the type of hydrogen bond formation with participation of lone-pair electrons of nitrogen atom, has been found). On the other hand, the measured decay time profiles of fluorescence are visibly longer in methanol solution than in non-polar, aprotic solvents and these observations are consistent with the observed increase in fluorescence intensity of both molecules in strongly polar methanol solution. The radiative lifetimes of the first excited singlet state do not differ noticeably for both molecules, but it has turned out that in the case of phenanthridine the nonradiative processes are getting less effective in methanol solution than in the case of 7,8-benzoquinoline, which can presumably be related to the role of different position of the substitution of nitrogen atom in these two molecules.
Źródło:
Acta Physica Polonica A; 2003, 104, 5; 425-439
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Towards miniaturized sensors for determination of exchangeable potassium in soil samples
Autorzy:
Grygolowicz-Pawlak, E.
Plachecka, K.
Wolanin, B.
Malinowska, E.
Powiązania:
https://bibliotekanauki.pl/articles/25360.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
soil analysis
measurement
soil
inductively coupled plasma-mass spectroscopy
atomic absorption spectroscopy
miniaturization
potentiometric electrode
standard method
nutrient level
flame emission spectroscopy
Źródło:
International Agrophysics; 2006, 20, 2
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
X-Ray Absorption Near Edge Spectroscopy of Sulfur in Biomolecules: Two Examples from Glutathione and Insulin
Autorzy:
Cinque, G.
Bellisola, G.
Colombatti, M.
Burattini, E.
Powiązania:
https://bibliotekanauki.pl/articles/2044672.pdf
Data publikacji:
2006-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Dm
87.64.Gb
Opis:
Although a minor constituent of cell and tissues, sulfur is an essential element to fulfil a wide range of biological processes, and it is present in the functional groups of many biomolecules that participate to redox reactions in vivo. Cysteine, one of the two S-containing aminoacids present in proteins, contains sulfur in fully reduced form and its thiol group can undergo a range of reactions under physiological conditions. X-ray absorption spectroscopy represents a unique tool to speciate the redox state of sulfur in biomolecules because of the known strong correlation between oxidation state and absorption edge energy shift (over 10 eV). Moreover, a rich X-ray absorption near edge structure is related to the chemical structures of S-containing biomolecules, as well as significant spectral changes due to biochemical action. The formation of a disulfide bond, i.e. a covalent linkage between the S atoms of two cysteine residues, or its reduction were investigated only indirectly in biomolecules. X-ray absorption spectroscopy experiments at the sulfur K-edge were performed at the soft X-ray beamline in Frascati using the wiggler source of the 0.51 GeV storage ring DAΦNE. X-ray absorption near edge structure data were collected to distinguish in situ between S-thiol and disulfide on model protein systems. Such preliminary results confirm this technique as a unique probe of sulfur chemistry in vivo. Quantitative speciation of S-metabolites can be foreseen in biological tissues with no chemical manipulations of the specimen.
Źródło:
Acta Physica Polonica A; 2006, 109, 3; 335-340
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
X-Ray Absorption Near Edge Structure and Mössbauer Spectroscopy in Study of Iron Valence States in Tissues
Autorzy:
Dziedzic-Kocurek, K.
Banaś, A.
Kwiatek, W. M.
Stanek, J.
Powiązania:
https://bibliotekanauki.pl/articles/2044673.pdf
Data publikacji:
2006-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.18.Fs
61.10.Ht
Opis:
X-ray absorption near edge structure Fe K-edge spectra and $\text{}^{57}$Fe Mössbauer spectra of selected standard compounds were recorded at room temperature. Valence and spin states of Fe in these samples known from Mössbauer spectroscopy were correlated with the shapes of X-ray absorption near edge structure spectra in search of possible application of X-ray absorption near edge structure spectroscopy as analytical tool determining local electronic states of iron in tissues. As an example, the X-ray absorption near edge structure spectra of healthy and cancerous tissues of prostate are shown, suggesting Fe$\text{}^{3+}$ in cancerous tissues.
Źródło:
Acta Physica Polonica A; 2006, 109, 3; 341-345
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heavy metal concentration in plerocercoids of Triaenophorus nodulosus [Pallas, 1781] [Cestoda: Triaenophoridae] and in different organs of their host - perch Perca fluviatilis [L.]
Autorzy:
Popiolek, M.
Okulewicz, A.
Dobicki, W.
Nowak, R.
Powiązania:
https://bibliotekanauki.pl/articles/836654.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
Triaenophorus nodulosus
organ
atomic absorption spectroscopy
water pollutant
different organ
host
parasite
Cestoda
determination
perch
plerocercoid
Triaenophoridae
Perca fluviatilis
concentration
water pollution
heavy metal
Źródło:
Annals of Parasitology; 2007, 53, 1
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heavy metal concentration in plerocercoids of Triaenophorus nodulosus [Pallas, 1781] [Cestoda: Triaenophoridae] and in different organs of their host - perch Perca fluviatilis [L.]
Autorzy:
Popiołek, M.
Okulewicz, A.
Dobicki, W.
Nowak, R.
Powiązania:
https://bibliotekanauki.pl/articles/2143843.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
Triaenophorus nodulosus
organ
atomic absorption spectroscopy
water pollutant
different organ
host
parasite
Cestoda
determination
perch
plerocercoid
Triaenophoridae
Perca fluviatilis
concentration
water pollution
heavy metal
Opis:
Background. Heavy metals are at present classified among the most important and dangerous water pollutants. Since over 15 years parasites have been used as a bioindicators of water pollution, e.g. using their ability to accumulate heavy metals. Concentration of four elements (Zn, Cd, Ni, Cu) in selected organs of the perch (Perca fluviatilis) and in the tissues of its parasite, plerocercoid of the tapeworm Triaenophorus nodulosus, was analysed. Material and methods. The fish were subject to full helminthological section, resulting in 66 tapeworm larvae isolated from cysts, located in the liver. Plerocecroids, gills, liver and intestine with duodenum were removed and frozen. Content of heavy metals was determined with atomic absorption spectroscopy method. Results. The distribution of the content of Ni, Cd and Zn was similar. In all cases, among all the examined fish organs, the highest mean concentration of the metals was found in the liver, followed by the intestine; it was the lowest in the gills. The mean concentration of the metals in the tapeworm tissues was from 6 to 74 x higher than in the gills, 5−37 x higher than in the intestine and 2.5−28 x higher than in the liver. The concentration of Cu was also the highest in the tapeworm tissues, but its concentration in the fish intestine and liver was nearly the same; it was the lowest in the gills.
Źródło:
Wiadomości Parazytologiczne; 2007, 53, 1; 21-24
0043-5163
Pojawia się w:
Wiadomości Parazytologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solid Phase Extraction for Evaluation of Occupational Exposure to Pb (II) Using XAD-4 Sorbent Prior to Atomic Absorption Spectroscopy
Autorzy:
Shahtaheri, S. J.
Khadem, M.
Golbabaei, F.
Rahimi-Froushan, A.
Ganjali, M. R.
Norouzi, P.
Powiązania:
https://bibliotekanauki.pl/articles/90822.pdf
Data publikacji:
2007
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
lead
sample preparation
atomic absorption spectroscopy
Opis:
Lead is an important constituent widely used in different industrial processes. For evaluation of workers’ exposure to trace toxic metal of Pb (II), solid-phase extraction (SPE) was optimized. SPE using mini columns filled with XAD-4 resin was developed with regard to sample pH, ligand concentration, loading flow rate, elution solvent, sample volume, elution volume, the amount of resins, and sample matrix interferences. Lead ions were retained on a solid sorbent and then eluted, followed by a simple determination of analytes with flame atomic absorption spectrometery. The obtained recoveries of metal ions were greater than 92%. This method was validated with 3 different pools of spiked urine samples; it showed a good reproducibility over 6 consecutive days as well as 6 within-day experiments. This optimized method can be considered successful in simplifying sample preparation for a trace residue analysis of lead in different matrices when evaluating occupational and environmental exposures is required.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2007, 13, 2; 137-145
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wykorzystanie spektrofotometrii w bliskiej podczerwieni do wyznaczania zawartości wody w izolacji papierowo-olejowej
Near infrared spectroscopy as diagnostic method of moisture content in paper-oil insulation
Autorzy:
Bródka, B.
Przybyłek, P.
Powiązania:
https://bibliotekanauki.pl/articles/153213.pdf
Data publikacji:
2008
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
izolacja papierowo-olejowa
zawartości wody
spektrofotometria absorpcyjna
oil-paper insulation
moisture content
absorption spectroscopy
Opis:
W artykule przedstawiono możliwości wykorzystania spektrofotometrii w bliskiej podczerwieni do wyznaczania zawilgocenia izolacji papierowo-olejowej. Wzrost zawilgocenia powoduje wzrost absorbancji. Stwierdzono liniową zależność absorbancji od zawartości wody w izolacji papierowo-olejowej.
In the article possibilities of using near infrared spectroscopy to evaluation of paper-oil insulation humidity are presented. The increase of water content causes the growth of absorbance. The absorbance as linear function of water content in paper-oil insulation was stated.
Źródło:
Pomiary Automatyka Kontrola; 2008, R. 54, nr 10, 10; 679-681
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cavity Enhanced Absorption Spectroscopy Sensor
Autorzy:
Nowakowski, M.
Wojtas, J.
Bielecki, Z.
Mikołajczyk, J.
Powiązania:
https://bibliotekanauki.pl/articles/1807740.pdf
Data publikacji:
2009-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.50.Qx
42.79.Sz
43.60.-c
07.07.Df
Opis:
The paper presents opportunities of cavity enhanced absorption spectroscopy technique application in nitrogen oxides (NO_{x}) detection. In this method the concentration of an absorbing gas is determined by measure of decay time of the light pulse trapped in an optical cavity. The measurements are not sensitive to fluctuation of both laser power and photodetector sensitivity. The cavity enhanced absorption spectroscopy technique is a modification of cavity ring down spectroscopy technique where the off-axis adjustment of the resonator is used. NO_{x} detection is carried out in the visible and infrared range. The signal is registered with a developed low noise photoreceiver. Features of the presented sensor show that it is possible to build a portable trace gases sensor. Its sensitivity could be comparable with chemical detectors. Such a system has several advantages: relatively low price, small size and weight, and detection possibility of other gases.
Źródło:
Acta Physica Polonica A; 2009, 116, 3; 363-367
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Femtosecond X-ray Absorption Spectroscopy οf a Light-Driven Spin-Crossover Process
Autorzy:
Milne, C.
Pham, V.
Gawelda, W.
Nahhas, A.
van der Veen, R.
Johnson, S.
Beaud, P.
Ingold, G.
Borca, C.
Grolimund, D.
Abela, R.
Chergui, M.
Bressler, Ch.
Powiązania:
https://bibliotekanauki.pl/articles/1539083.pdf
Data publikacji:
2010-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Dm
75.30.Wx
Opis:
Understanding the initial steps during ultrafast molecular reactions involving large spin state changes is a vital goal in structural dynamics research. These involve knowledge of the geometric structure of the system. Ultrafast X-ray absorption spectroscopy with 50-100 picosecond time resolution establishes the geometric structure of the short-lived (τ = 0.6 ns) high spin state. Here we focus on time-resolved X-ray absorption studies with 160-200 fs temporal resolution to monitor the structural evolution in this spin-conversion process.
Źródło:
Acta Physica Polonica A; 2010, 117, 2; 391-393
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
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