Ⅰ. INTRODUCTION 13C-CPMAS, the combination of magic angle spinning of specimen （MAS） with high power proton decoupling and 1H-13C cross-polarization （CP）, is proved to be a powerful means for research. It enables...Ⅰ. INTRODUCTION 13C-CPMAS, the combination of magic angle spinning of specimen （MAS） with high power proton decoupling and 1H-13C cross-polarization （CP）, is proved to be a powerful means for research. It enables us to have obtained high resolution NMR spectra of展开更多
Ⅰ. INTRODUCTION The observation of the spectra of the SVC sources is very important in the theory of the slowly varying component (SVC) and for the prediction of solar-terrestrial environment. In order to increase th...Ⅰ. INTRODUCTION The observation of the spectra of the SVC sources is very important in the theory of the slowly varying component (SVC) and for the prediction of solar-terrestrial environment. In order to increase the spatial resolution, solar radio astronomers made used of solar eclipses to observe the SVC sources over a wide range of frequencies to ob-展开更多
When the problems of each subject sphere are studied by using the Mssbauer effect, it is desirable to obtain the most precise and accurate estimates of peak position, and often of peak widths and areas. In the process...When the problems of each subject sphere are studied by using the Mssbauer effect, it is desirable to obtain the most precise and accurate estimates of peak position, and often of peak widths and areas. In the process of analysing Mssbauer spectra, the common ways are fitting and stripping the spectra by the computer programs. But for the complex Mssbauer spectra, for example, the analysis of the展开更多
In the present paper, we are reporting the syntheses and spectra of methyl, ethylcyclopentadienyl chlorides and triphenylsiloxy derivatives of the fourth transition metals.
To improve the goodness of fitting 57Fe M?ssbauer spectra of ferromagnetic amorphous alloys, two problems should be resolved:（ⅰ）How to analyse the asymmetry of peak amplitudes and peak widths in the spectrum about ...To improve the goodness of fitting 57Fe M?ssbauer spectra of ferromagnetic amorphous alloys, two problems should be resolved:（ⅰ）How to analyse the asymmetry of peak amplitudes and peak widths in the spectrum about the spectrum centre; （ⅱ） how to correct the parameters concerned, e. g. the peak area ratio and peak widths in basic subspectra and the average isomer shift, in fitting spectra with the Hesse method or the Window method. In the present note the asym-展开更多
In recent years, in （K-, π-） strangeness-exchange reaction on nuclei, some hypernuclear spectra such as Λ9Be, Σ9Be, and Λ12C, Σ12C have been found. By analysing the experimental excited spectra of recoilless st...In recent years, in （K-, π-） strangeness-exchange reaction on nuclei, some hypernuclear spectra such as Λ9Be, Σ9Be, and Λ12C, Σ12C have been found. By analysing the experimental excited spectra of recoilless strangeness-exchange reaction （K-, π-）, one can展开更多
In glasses there is serious diagonal and off-diagonal disorder for paramagnetic ion sites due to the long range disorder of the glass structure. The study on time-resolved fluorescence spectra is of significance for r...In glasses there is serious diagonal and off-diagonal disorder for paramagnetic ion sites due to the long range disorder of the glass structure. The study on time-resolved fluorescence spectra is of significance for revealing the spectral behavior of different sites and the energy transfer between them, and for developing laser materials.展开更多
Problem on spectra of conjugate molecules having repeated units have been discussed before. However, most of these discussions are confined to molecules that have only single bond between adjacent repeated units. In t...Problem on spectra of conjugate molecules having repeated units have been discussed before. However, most of these discussions are confined to molecules that have only single bond between adjacent repeated units. In this paper, the results of a previous paper are extended to include the case of straight chain conjugate展开更多
Complexes of transition metals with histidine play an important role in biochemistry. Walik has studied vanadyl histidine complex by IR at pH=4.5 and suggested that histidine should be coordinated to vanadium atom thr...Complexes of transition metals with histidine play an important role in biochemistry. Walik has studied vanadyl histidine complex by IR at pH=4.5 and suggested that histidine should be coordinated to vanadium atom through amino N and earbexyl O to form a 1:2 complex VO （His）2. Johnson has reported ESR spectra展开更多
I. INTRODUCTION Much work has been done on the experimental observations and crystal field analyses of the electronic spectra of Fe2+ in orthopyroxenes. More than twenty bands have been observed in the region from 220...I. INTRODUCTION Much work has been done on the experimental observations and crystal field analyses of the electronic spectra of Fe2+ in orthopyroxenes. More than twenty bands have been observed in the region from 2200—22700cm-1 However, only three stronger absorption bands in infrared have been theoretically analyzed, while展开更多
The 2,2,6,6-tetramethylpiperidine nitroxide radicals have been receiving more and more attention from people owing to their thermal stability and application for protecting polymer materials from photo-oxidation and p...The 2,2,6,6-tetramethylpiperidine nitroxide radicals have been receiving more and more attention from people owing to their thermal stability and application for protecting polymer materials from photo-oxidation and photo-degradation. In their EI mass spectra the relative intensity of the peak of the nitroxide radical with mass number (FW+1) is usually greater than that calculated according to its natural abundance of elemental composition of the FW peak, and sometimes even greater than that of the FW peak. Therefore, it was difficult to assign the formula weight (FW) of nitroxide radical by the EI method.展开更多
Ⅰ. INTRODUCTION The M?ssbauer spectra （MS） of a Ca2+, In2+ and Ge4+ substituted yttrium iron garnet （YIG）-Y2.78Ca0.25In0.60Ge0.25Fe4.11O12（Y—Ca—In—GeIG） cannot be resolved simply into two sets of octahedral...Ⅰ. INTRODUCTION The M?ssbauer spectra （MS） of a Ca2+, In2+ and Ge4+ substituted yttrium iron garnet （YIG）-Y2.78Ca0.25In0.60Ge0.25Fe4.11O12（Y—Ca—In—GeIG） cannot be resolved simply into two sets of octahedral（a） and tetrahedral （d） subspectra, since the nonequivalent environment （NE） resulting from random distribution of nonmagnetic ions can influence the MS. If the probabilities Pnm of NE which is less than 8％, were neglected, then the （a） and （d） subspectra each can be again resolved into two and three sets展开更多
The photoluminescence(PL)peak of poly p-phenyl phenol(PPP)is at about 370-420nm excited by the light at 350nm.The absorption band edges and photon emitting peaks of the polymer are found the conjugated lengths depende...The photoluminescence(PL)peak of poly p-phenyl phenol(PPP)is at about 370-420nm excited by the light at 350nm.The absorption band edges and photon emitting peaks of the polymer are found the conjugated lengths dependent on molecular weight of polymer.In the transient luminescence measurement the lifetime of PL decay is determined to be 2.0ns which is supposed an evidence of polaron excitation recombination.The electroluminescence is observed with aluminum/PPP/indium-tinoxide cell.展开更多
The bilayer heterojunction devices were fabricated successfully by using a novel oxadiazole derivative:2,2-(2,5-thiophenediyl)bis(5-(4-methyl)phenyl-1,3,4-oxadiazole)(T-OXD)as the electron-transporting layer(ETL)and a...The bilayer heterojunction devices were fabricated successfully by using a novel oxadiazole derivative:2,2-(2,5-thiophenediyl)bis(5-(4-methyl)phenyl-1,3,4-oxadiazole)(T-OXD)as the electron-transporting layer(ETL)and a pyrazoline derivative:1-phenyl-3-(dimethylamino)styryl-5-(p-(dimethylamino)phenyl)pyrazoline(PDP)as the light-emitting layer and the hole-transporting layer.The emission at 500nm was derived from PDP layer.In comparison with the bilayer device of tris(8-hydroxyquinoline)aluminum(Alq)as the ETL,the luminous efficiency of the PDP/T-OXD heterojunction device was enhanced by 104 times.展开更多
文摘Ⅰ. INTRODUCTION 13C-CPMAS, the combination of magic angle spinning of specimen （MAS） with high power proton decoupling and 1H-13C cross-polarization （CP）, is proved to be a powerful means for research. It enables us to have obtained high resolution NMR spectra of
文摘Ⅰ. INTRODUCTION The observation of the spectra of the SVC sources is very important in the theory of the slowly varying component (SVC) and for the prediction of solar-terrestrial environment. In order to increase the spatial resolution, solar radio astronomers made used of solar eclipses to observe the SVC sources over a wide range of frequencies to ob-
文摘When the problems of each subject sphere are studied by using the Mssbauer effect, it is desirable to obtain the most precise and accurate estimates of peak position, and often of peak widths and areas. In the process of analysing Mssbauer spectra, the common ways are fitting and stripping the spectra by the computer programs. But for the complex Mssbauer spectra, for example, the analysis of the
文摘In the present paper, we are reporting the syntheses and spectra of methyl, ethylcyclopentadienyl chlorides and triphenylsiloxy derivatives of the fourth transition metals.
文摘To improve the goodness of fitting 57Fe M?ssbauer spectra of ferromagnetic amorphous alloys, two problems should be resolved:（ⅰ）How to analyse the asymmetry of peak amplitudes and peak widths in the spectrum about the spectrum centre; （ⅱ） how to correct the parameters concerned, e. g. the peak area ratio and peak widths in basic subspectra and the average isomer shift, in fitting spectra with the Hesse method or the Window method. In the present note the asym-
文摘In recent years, in （K-, π-） strangeness-exchange reaction on nuclei, some hypernuclear spectra such as Λ9Be, Σ9Be, and Λ12C, Σ12C have been found. By analysing the experimental excited spectra of recoilless strangeness-exchange reaction （K-, π-）, one can
文摘In glasses there is serious diagonal and off-diagonal disorder for paramagnetic ion sites due to the long range disorder of the glass structure. The study on time-resolved fluorescence spectra is of significance for revealing the spectral behavior of different sites and the energy transfer between them, and for developing laser materials.
文摘Problem on spectra of conjugate molecules having repeated units have been discussed before. However, most of these discussions are confined to molecules that have only single bond between adjacent repeated units. In this paper, the results of a previous paper are extended to include the case of straight chain conjugate
文摘Complexes of transition metals with histidine play an important role in biochemistry. Walik has studied vanadyl histidine complex by IR at pH=4.5 and suggested that histidine should be coordinated to vanadium atom through amino N and earbexyl O to form a 1:2 complex VO （His）2. Johnson has reported ESR spectra
文摘I. INTRODUCTION Much work has been done on the experimental observations and crystal field analyses of the electronic spectra of Fe2+ in orthopyroxenes. More than twenty bands have been observed in the region from 2200—22700cm-1 However, only three stronger absorption bands in infrared have been theoretically analyzed, while
文摘The 2,2,6,6-tetramethylpiperidine nitroxide radicals have been receiving more and more attention from people owing to their thermal stability and application for protecting polymer materials from photo-oxidation and photo-degradation. In their EI mass spectra the relative intensity of the peak of the nitroxide radical with mass number (FW+1) is usually greater than that calculated according to its natural abundance of elemental composition of the FW peak, and sometimes even greater than that of the FW peak. Therefore, it was difficult to assign the formula weight (FW) of nitroxide radical by the EI method.
文摘Ⅰ. INTRODUCTION The M?ssbauer spectra （MS） of a Ca2+, In2+ and Ge4+ substituted yttrium iron garnet （YIG）-Y2.78Ca0.25In0.60Ge0.25Fe4.11O12（Y—Ca—In—GeIG） cannot be resolved simply into two sets of octahedral（a） and tetrahedral （d） subspectra, since the nonequivalent environment （NE） resulting from random distribution of nonmagnetic ions can influence the MS. If the probabilities Pnm of NE which is less than 8％, were neglected, then the （a） and （d） subspectra each can be again resolved into two and three sets
文摘The photoluminescence(PL)peak of poly p-phenyl phenol(PPP)is at about 370-420nm excited by the light at 350nm.The absorption band edges and photon emitting peaks of the polymer are found the conjugated lengths dependent on molecular weight of polymer.In the transient luminescence measurement the lifetime of PL decay is determined to be 2.0ns which is supposed an evidence of polaron excitation recombination.The electroluminescence is observed with aluminum/PPP/indium-tinoxide cell.
基金Supported by the National Natural Science Foundation of China under Grant No.597905006。
文摘The bilayer heterojunction devices were fabricated successfully by using a novel oxadiazole derivative:2,2-(2,5-thiophenediyl)bis(5-(4-methyl)phenyl-1,3,4-oxadiazole)(T-OXD)as the electron-transporting layer(ETL)and a pyrazoline derivative:1-phenyl-3-(dimethylamino)styryl-5-(p-(dimethylamino)phenyl)pyrazoline(PDP)as the light-emitting layer and the hole-transporting layer.The emission at 500nm was derived from PDP layer.In comparison with the bilayer device of tris(8-hydroxyquinoline)aluminum(Alq)as the ETL,the luminous efficiency of the PDP/T-OXD heterojunction device was enhanced by 104 times.
