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Wyświetlanie 1-15 z 28
Tytuł:
Wpływ nawożenia korą sosnową na wzrost i rozwój sadzonek sosny zwyczajnej
Vlijanie udobrenija sosnovojj korojj na rost i razvitie sazhencev sosny obyknovennojj
The influence of the fertilization with pine bark on the growth and development of the seedlings of Scots Pine
Autorzy:
Filipek, Z.
Hoffmann, M.
Duda, J.
Drogosz, S.
Powiązania:
https://bibliotekanauki.pl/articles/814568.pdf
Data publikacji:
1973
Wydawca:
Polskie Towarzystwo Leśne
Źródło:
Sylwan; 1973, 117, 06
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vibronic Effects in EPR Spectra of (NH$\text{}_{4}$)$\text{}_{2}$Cu(BeF$\text{}_{4}$)$\text{}_{2}$·6H$\text{}_{2}$0 Single Crystal
Autorzy:
Hoffmann, S.
Gomółka-Marciniak, M.
Powiązania:
https://bibliotekanauki.pl/articles/1929355.pdf
Data publikacji:
1993-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.-v
71.70.Ej
Opis:
Angular variations of the g-factors and linewidth value were recorded at X-band, at room temperature, and at 77 K. The temperature dependence of the g-factors was measured along the principal g-tensor axes in the temperature range from 4.2 K to 300 K. The rigid lattice g-factors at 4.2 K are: g$\text{}_{z}$ = 2.428, g$\text{}_{y}$ = 2.138, and g$\text{}_{x}$ = 2.058. The g$\text{}_{x}$ value very slowly increases linearly on heating, whereas g$\text{}_{z}$ and g$\text{}_{y}$ nonlinearly tend towards their average value. This is a typical behaviour of Cu(II) EPR in Tutton salt crystals, however the g(T) dependence is much less pronounced in (NH$\text{}_{4}$)$\text{}_{2}$Cu(BeF$\text{}_{4}$)$\text{}_{2}$·6H$\text{}_{2}$0 as compared to the Cu(II) doped salts. The results are described in terms of the two vibronic coupling models of the strong Jahn-Teller effect. It is shown that the models are not adequate to describe the vibronic g-factor behaviour in paramagnetic Cu(II) crystals which is attributed to the cooperative Jahn-Teller effect existing in these crystals.
Źródło:
Acta Physica Polonica A; 1993, 83, 6; 817-830
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ultrafast Phenomena in II-VI Semiconductors
Autorzy:
Kalt, H.
Wachter, S.
Lüerssen, D.
Hoffmann, J.
Powiązania:
https://bibliotekanauki.pl/articles/1968987.pdf
Data publikacji:
1998-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.47.+p
42.50.Md
71.35.-y
Opis:
We review studies on the coherent and incoherent exciton dynamics in ZnSe-based quantum wells. First, the exciton-exciton scattering parameter is determined from femtosecond four-wave mixing as a function of background exciton density generated by a prepulse. A linear increase in the excitonic homogeneous linewidth is found as a function of the background exciton density with significant different scattering parameters for the cases of interaction with coherent or incoherent excitons. Second, the thermalization dynamics of spectrally narrow hot-exciton distributions is investigated by time-resolved phonon sideband spectroscopy. Thermalization assisted by acoustic phonons occurs on a 100 ps timescale, which is in good agreement with model calculations in time dependent perturbation theory.
Źródło:
Acta Physica Polonica A; 1998, 94, 2; 139-146
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of the 210Pb method for preliminary evaluating the sedimentation rate in Amazon river mouth
Zastosowanie metody 210Pb do wstepnej oceny intensywnosci sedymentacji w ujsciu rzeki Amazonki
Autorzy:
Althammer, S
Fosshag, E
Hoffmann, H.M.
Nery, J.R.C.
Bonotto, D.M.
Powiązania:
https://bibliotekanauki.pl/articles/81487.pdf
Data publikacji:
2010
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
210Pb method
sedimentation rate
Amazon River
river mouth
Opis:
This investigation reports the preliminary results for determining the sedimentation rate at the Amazonas River mouth, Brazil, by the 210Pb method. The CIC (constant initial concentration) of unsupported/excess 210Pb model was successfully applied to one sediments core. The measurements were made in a sediments core comprising ten samples 10 cm – thick each. The year of the sampling (2006) was used as reference for the establishment of the rate of sedimentation from the beginning of the top of the testimony. However, the atmospheric conditions and climate in Amapá State, Brazil, claimed for optimization of the results. Because the Channel North is opened into the Atlantic Ocean, it exhibits a huge water volume, causing a permanent motion of sediments and water. So, heavy waves are formed at the water surface, stirring the upper sand strata. Only at a depth of 40–50 cm the profile tends to be more homogeneous, where it is mostly composed by fine sand and very fine sand. Thus, it is reasonable utilize the CIC model from 210Pb data, which allows estimate a sedimentation rate corresponding to 0.61 g/cm²yr and a mean linear rate of 0.8 cm/yr. The 238U and 210Pb activities in the sediments allowed the reconstruction of the sedimentation processes over a period of about 130 years.
W pracy przedstawiono wyniki badań przebiegu procesu sedymentacji w obszarze ujściowym rzeki Amazonki. Do oceny intensywności sedymentacji wykorzystano model CIC (Constant Initial Concentration) aktywności 210Pb, którą badano w dziesięciu 10-cm warstwach osadu pobranego w 2006 roku. Zastosowana metoda pozwoliła na ocenę przebiegu procesu sedymentacji osadów w okresie 130 lat. Górne warstwy osadów o miąższości 40–50 cm posiadają zaburzoną strukturę i aktywność 210Pb, spowodowaną okresowym oddziaływaniem fal oceanicznych i wód słonych. Dolne warstwy osadu, w których dominują piaski bardzo drobne i drobne, posiadają homogeniczną strukturę oraz liniowo zmienną aktywność 210Pb. Stwierdzono, że średnia intensywność sedymentacji w analizowanym obszarze wynosi 0,61 g⋅cm–²⋅rok–1, co odpowiada warstwie o miąższości 0,8 cm⋅rok–1.
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation; 2010, 42, 1; 149-157
0208-5771
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Role of Ferric(III) Oxide in Poly-(1,4-Phenylene Sulphide) Curing. EPR and X-ray Studies
Autorzy:
Wejchan-Judek, M.
Hoffmann, S. K.
Goslar, J.
Garbarczyk, J.
Powiązania:
https://bibliotekanauki.pl/articles/2043404.pdf
Data publikacji:
2005-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.-v
61.41.+e
Opis:
Commercially available poly-(1,4-phenylene sulfide) = PPS with trade names TEDUR and RYTON contain a great amount of Fe(III) (order of 10$\text{}^{20}$ Fe/gram) as shown by electron spin resonance spectra. The curing of the pure and Fe-doped (0.2% Fe$\text{}_{2}$O$\text{}_{3}$) PPS polymers proves that Fe(III) can be used for improvement of the PPS strength by increasing the polymer cross-linking and a decrease in the polymer crystallinity degree as shown by X-ray diffraction.
Źródło:
Acta Physica Polonica A; 2005, 108, 1; 107-112
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The biological effect of cage design corrected for reductions in spray penetration
Autorzy:
Fritz, B.K.
Hoffmann, W.C.
Bonds, J.A.S.
Haas, K.
Czaczyk, Z.
Powiązania:
https://bibliotekanauki.pl/articles/65270.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
In-field measures of physical spray concentration do not tend to correlate well with caged insect mortality data. This is partly due to the reduced penetration of the spray into the cage. Spray penetration is hindered by the structure of the cage. Wind tunnel studies were conducted to investigate the accuracy of those calculations developed to correct for filtration levels in caged mosquito bioassays. Zenivex E20 (Etofenprox) was applied at rates ranging from an LD10 to an LD90. Three cage types were used, each with different penetration levels. The dose approaching the cage was converted to the dose entering the cage using cage penetration data from previous research. The penetration conversion factor returned a data set that directly correlated dose with mosquito mortality (R2 = = 0.918). The mortality percent was a function of the dose within the cage. The mesh type acted as a regulator. Although the conversion factor was effective, the differences between cages was not always significant due to within-group variation.
Źródło:
Journal of Plant Protection Research; 2014, 54, 4
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature Effects in ESR Spectra of Radical Centres in Dripstone Calcite Samples Used for ESR Dating
Autorzy:
Wencka, M.
Hoffmann, S. K.
Krzyminiewski, R.
Mielcarek, S.
Powiązania:
https://bibliotekanauki.pl/articles/2043694.pdf
Data publikacji:
2005-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.-v
65.90.+i
Opis:
Natural calcite samples were collected from the dripstone layers of the Black Cave of the Tatra Mountains. ESR spectra, thermal analysis, and thermoluminescence data were analysed to obtain a consistent picture of the calcite properties. The ESR spectra were analysed using computer enhanced resolution spectra and an influence of the thermal annealing on intensity of individual ESR lines was measured. These results together with the effects of γ-irradiation in ESR spectra allowed one to discriminate between ESR lines from various paramagnetic centres. A general conclusion of the paper is that in the ESR dating the outer ESR lines of CO$\text{}_{3}^{-}$ (g=2.0125) and CO$\text{}_{2}^{-}$ (g=1.9980) radicals should be used instead of the commonly used multicomponent central line.
Źródło:
Acta Physica Polonica A; 2005, 108, 3; 491-503
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Self-concerted hydrophobicity scale based on the ACDlogP of a combination of 8000 tripeptides and its application for identification of protein active sites
Autorzy:
Eitner, K.
Koch, U.
Gawęda, T.
Spieser, S.
Fornalik, A.
Hoffmann, M.
Powiązania:
https://bibliotekanauki.pl/articles/346961.pdf
Data publikacji:
2008
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Tematy:
active site identification
fuzzy-oil-drop model
hydrophobicity
tripeptides
Opis:
Partition coefficients, expressed as logP, were calculated using Advanced Chemistry Development software (ACDlogP) [1] of all combinations of three amino acids (8000 tripeptides). Using our proprietary script, we generated a combination of 8000 tripeptides of 20 amino acids in the FASTA format and, subsequently, full atom Cartesian coordinates were generated. The ACDlogP’s of the generated tripeptides were calculated. Using the Kyte-Doolittle amino acid hydrophobicity scale [2, 3], the value of the correlation coefficients with the calculated ACDlogP values was determined. Hydrophobicity values were assumed as the arithmetic mean of the hydrophobicity of the three amino acids in the tripeptide. Optimisation of the theoretical hydrophobicity scale by minimisation of the correlation coefficient between the calculated ACDlogP values and the hydrophobicity for the tripeptides provided amino acid hydrophobicity; on this basis, the amino acids were divided into 7 groups. The new scale was normalised and implemented using the fuzzy-oil-drop model method to determine the theoretical protein active site of the 1HCK protein based on lipophilic hot spots on the protein surface. The results were compared with the respective results for the Kyte-Doolittle scale and the actual active site with ATP as the ligand.
Źródło:
Ars Separatoria Acta; 2008, 6; 7-14
1731-6340
Pojawia się w:
Ars Separatoria Acta
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Restricted Validity of the Two-State Model Describing a Vibronic EPR g-Factors Averaging in Cs$\text{}_{2}$Zn(SO$\text{}_{4}$)$\text{}_{2}$·6H$\text{}_{2}$O Tutton Salt Crystals Doped with Cu$\text{}^{2+}$ Ions
Autorzy:
Hoffmann, S. K.
Kaszyński, R.
Augustyniak, M. A.
Hilczer, W.
Powiązania:
https://bibliotekanauki.pl/articles/2011161.pdf
Data publikacji:
1999-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
63.90.+t
76.30.-v
Opis:
Single crystals and powder EPR spectra of Cu$\text{}^{2+}$ ions in Cs$\text{}_{2}$Zn(SO$\text{}_{4}$)$\text{}_{6}$·6H$\text{}_{2}$O were recorded in the temperature range of 4.2-300 K and the g-factor temperature variations were determined. The g$\text{}_{z}$ and g$\text{}_{y}$ have the values of 2.443 and 2.134, respectively, at the rigid lattice limit below 20 K, and then continuously tend to an average value on heating. This vibronic averaging produced by reorientations of Cu(H$\text{}_{2}$O)$\text{}_{6}$-complexes between Jahn-Teller distorted octahedral configurations is described in terms of a two-state Silver-Getz model which is known as a good model for diamagnetic non-ammonium Tutton salts. We found, however, that this model is only a crude approximation in Cs$\text{}_{2}$Zn(SO$\text{}_{4}$)$\text{}_{6}$·6H$\text{}_{2}$O below 150 K. Above this temperature the model works better and describes the vibronic dynamics between the two lowest energy potential wells in the adiabatic potential surface differing in the energy of δ$\text{}_{12}$=318(9) cm$\text{}^{-1}$=3.7 kJ/mol.
Źródło:
Acta Physica Polonica A; 1999, 96, 6; 733-740
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Precursors of volatile organic compounds emitted during phosphorite processing
Autorzy:
Śliwak, A.
Gryglewicz, S.
Hoffmann, J.
Gryglewicz, G.
Powiązania:
https://bibliotekanauki.pl/articles/779723.pdf
Data publikacji:
2012
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
fosforyty
bitumen
skład
zapachy
phosphorites
composition
odours
Opis:
The composition of solvent-soluble organic matter of phosphorite, which is a precursor of volatile organic compounds emitted by the fertilizer industry, was studied. A benzene-methanol mixture and chloroform were used for the extraction of free and bound bitumen from phosphorites, respectively. The separated bitumen fractions were characterized qualitatively by GC-MS and quantitatively by GC-FID. n-Alkanes, n-alkenes, fatty acids and isoprenoids were identified in the extracts. The main components were n-alkanes and n-alkenes, constituting over 80% of the total bitumen determined. An unexpected presence of n-alkenes only in the free bitumen fraction was found. The possible source of ill-smelling substances evolved during treatment of phosphorite with H2SO4 was discussed.
Źródło:
Polish Journal of Chemical Technology; 2012, 14, 2; 62-69
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photoemission Study of CO$\text{}_{2}$ adsorbed on K/Cu(110). Analysis of Adsorbate Induced Structures
Autorzy:
Godowski, P. J.
Onsgaard, J.
Hoffmann, S. V.
Nerlov, J.
Powiązania:
https://bibliotekanauki.pl/articles/2007842.pdf
Data publikacji:
1999-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.60.Jv
33.60.-q
82.80.Pv
Opis:
Using photoemission spectroscopy, adsorption and reaction of CO$\text{}_{2}$ on potassium modified Cu(110) were studied. In agreement with published results of thermally programmed desorption, apart from carbonate and carbon monoxide as the disproportionation reaction products, a linear CO$\text{}_{2}$ molecule and a bent active CO$\text{}_{2}$(-) species were identified. The reaction paths are independent on the potassium precoverage but the number of CO$\text{}_{3}$ molecules increases with the number of potassium adatoms. The presence of the CO$\text{}_{2}$(-), stable up to 200 K, suitable for the reactivity of the interface in respect of the methanol synthesis, could be confirmed in the complex valence band spectra by occurrence of the characteristic peak at binding energy of 6.8 eV.
Źródło:
Acta Physica Polonica A; 1999, 95, 3; 423-431
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation on the Phosphate Rock Dissolution Process by Partial Acidulation (PAPR Method) Using Sulfuric and Phosphoric Acid
Badania nad częściowym rozkładem fosforytu (metodą PAPR) z zastosowaniem kwasu siarkowego i fosforowego
Autorzy:
Hoffmann, K.
Skut, J.
Rybarski, S.
Hoffmann, J.
Powiązania:
https://bibliotekanauki.pl/articles/389068.pdf
Data publikacji:
2012
Wydawca:
Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:
fosforyty częściowo rozłożone (PAPR)
kwasy mineralne
nawozy fosforowe
fosforany przyswajalne
partially acidulated phosphate rocks (PAPR)
mineral acids
phosphate fertilizers
available P
Opis:
The results of few factors on the each form of phosphates content in the PAPR-type fertilizer preparations were presented. Type of mineral acid, its concentration, amount and fineness were taken into account. Investigation was carried out with the recommendations enclosed in Regulation (EC) No 2003/2003 of the European Parliament and the Council on 13.10.2003 related to fertilizers, test methods for the phosphate content evaluation in fertilizer.
Przedstawiono wyniki badań nad wpływem różnych czynników przy częściowym rozkładzie surowca fosforowego na zawartość związków fosforu w produkcie nawozowym. Uwzględniono wpływ rodzaju, stężenia i ilości kwasu mineralnego oraz uziarnienia surowca na zawartość poszczególnych form fosforanów oznaczonych zgodnie z dyrektywą Unii Europejskiej (EC) No. 2003/2003 dotyczącą metod badań zawartości fosforanów w nawozach sztucznych.
Źródło:
Ecological Chemistry and Engineering. A; 2012, 19, 8; 963-972
1898-6188
2084-4530
Pojawia się w:
Ecological Chemistry and Engineering. A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the Grain Size on Polaron Transport in Nanostructured La$\text{}_{2}\text{}_{/}\text{}_{3}$ Ca$\text{}_{1}\text{}_{/}\text{}_{3}$ MnO$\text{}_{3}$ Evidenced by EPR
Autorzy:
Raita, O.
Grecu, M. N.
Filip, X.
Toloman, D.
Giurgiu, L. M.
Idziak, S.
Hoffmann, S. K.
Powiązania:
https://bibliotekanauki.pl/articles/2043406.pdf
Data publikacji:
2005-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Tt
73.63.Bd
76.50.+g
Opis:
We report an electron paramagnetic resonance investigation of the grain size effects on the polaron transport in the paramagnetic regime of nanosized La$\text{}_{2}\text{}_{/}\text{}_{3}$ Ca$\text{}_{1}\text{}_{/}\text{}_{3}$ MnO$\text{}_{3}$ manganites. The temperature dependences of the EPR integral intensity were analyzed in terms of spin-spin exchange interaction and small polaron hopping scenarios. The polaron activation energy decreases with the reduction of the grain size. A discussion is given concerning the factors which could explain the observed change.
Źródło:
Acta Physica Polonica A; 2005, 108, 1; 113-118
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of Aerial Spray Technologies for Adult Mosquito Control Applications
Autorzy:
Hoffmann, W.C.
Fritz, B.K.
Farooq, M.
Walker, T.W.
Czaczyk, Z.
Hornsby, J.
Bonds, J.A.S.
Powiązania:
https://bibliotekanauki.pl/articles/65542.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Spray droplet size has long been recognized as an important variable that applicators of vector control sprays must be aware of to make the most effective spray applications. Researchers and applicators have several different techniques available to assess spray droplet size from spray nozzles. The objective of this study was to compare the droplet size spectrum produced by three nozzles commonly used in vector control in a high-speed wind tunnel, when characterized using three different laser-based droplet size measurement systems. Three droplet sizing systems: Malvern Spraytec laser diffraction, Sympatec HELOS laser diffraction, and TSI Phase Doppler Particle Analyzer (PDPA), were simultaneously operated, but under different operating conditions, to measure the spray droplet size-spectra for three spray nozzles. The three atomizers: a TeeJet® 8001E even flat fan nozzle, a BETE® PJ high pressure fog nozzles, and a Micronair ® AU5000 rotary atomizer were evaluated in a high speed wind tunnel at airspeeds of 53 and 62 m/s (120 and 140 mph). Based on the results of this work, only the BETE® PJ high pressure fog nozzles met the label requirements for both Fyfanon® and Anvil®. While the other nozzle might met the Dv0.5 (VMD - volume median diameter) requirement for Fyfanon®, the resulting Dv0.9 values exceeded labeled size restrictions. When applying Anvil with the BETE PJ high pressure fog nozzles, it is important to use the smaller two orifice sizes. The larger sizes tended to result in Dv0.9 values that exceeded label recommendations.
Źródło:
Journal of Plant Protection Research; 2013, 53, 3
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ESR and Electron Spin Echo Studies of Spin-Lattice Relaxation of Hydrazinium Radical in Li(N$\text{}_{2}$H$\text{}_{5}$)O$\text{}_{4}$ Single Crystal
Autorzy:
Morawski, P.
Hoffmann, S. K.
Hilczer, W.
Goslar, J.
Powiązania:
https://bibliotekanauki.pl/articles/1964224.pdf
Data publikacji:
1997-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.80.Ed
76.30.Rn
Opis:
A hydrazinium ṄH-NH$\text{}_{3}^{+}$ radical was identified by ESR in γ-irradiated Li(N$\text{}_{2}$H$\text{}_{5}$)SO$\text{}_{4}$ single crystal. Unpaired electron is strongly localized on the nitrogen atom as compared to hydrazinium radicals in other crystals. Angular variations of the multicomponent ESR spectra and computer calculations gave the isotropic hyperfine coupling parameters (in mT): a$\text{}_{N1}$ = 1.93, a$\text{}_{N2}$ = 0.80, a$\text{}_{H1}$ = 2.50, a$\text{}_{H1'}$ = 0.48 (NH$\text{}_{3}$), and a$\text{}_{H2}$ = 1.40 (adjacent molecule). The radiation defects containing unpaired electrons do not influence much the protonic conductivity along the hydrazine molecule chains in the crystal. It confirms a tunelling mechanism of the conductivity activated by NH$\text{}_{2}$-group rotation. Spin-lattice relaxation time T$\text{}_{1}$ varies strongly with temperature in the range from 100 ms (10 K) to 90 μs (170 K) and is governed by spectral diffusion (1/T$\text{}_{1}$ ∝ T$\text{}^{2}$) and a Murphy-type mechanism (1/T$\text{}_{1}$ ∝ cosech(Δ/T)) with Δ = 150 cm$\text{}^{-1}$. A distribution of the spin-relaxation times was observed with temperature independent dispersion parameter β = 0.76.
Źródło:
Acta Physica Polonica A; 1997, 91, 6; 1121-1129
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
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