The lattice vibrations and internal modes of polycrystalline CH 2 ClI and CD 2 ClI have been studied as a function of temperature using Raman and far-infrared spectroscopy. Both isotopic forms have four phases; one is...
The lattice vibrations and internal modes of polycrystalline CH 2 ClI and CD 2 ClI have been studied as a function of temperature using Raman and far-infrared spectroscopy. Both isotopic forms have four phases; one is plastic, one is partially ordered and the other two are fully ordered. Some aspects of the structures are discussed.
Raman and infrared spectra of solid chlorotrifluoromethane have been recorded in both the internal and lattice mode regions at temperatures between 20 K and its melting point. The spectra are compared to the predictio...
Raman and infrared spectra of solid chlorotrifluoromethane have been recorded in both the internal and lattice mode regions at temperatures between 20 K and its melting point. The spectra are compared to the predictions of a group theoretical analysis based on the known molecular and unit cell symmetries. The absence of a centre of inversion is confirmed. Plausible assignments of all main spectroscopic features are presented.
The Raman and infrared spectra between 30 and 3000 cm −1 of a new crystalline phase of methyltrichlorosilane, CH 3 SiCl 3 , at 20 K are reported. The spectra are consistent with a non-centrosymmetric crystal structure...
The Raman and infrared spectra between 30 and 3000 cm −1 of a new crystalline phase of methyltrichlorosilane, CH 3 SiCl 3 , at 20 K are reported. The spectra are consistent with a non-centrosymmetric crystal structure with at least four molecules per unit cell. A glassy phase is also detected.
The accuracy of PIXE analysis is enhanced by having available a complete characterization of the Si(Li) X-ray detector as regards both efficiency and resolution function (lineshape) in the 1–35 keV X-ray energy range...
The accuracy of PIXE analysis is enhanced by having available a complete characterization of the Si(Li) X-ray detector as regards both efficiency and resolution function (lineshape) in the 1–35 keV X-ray energy range. work in both these areas is reviewed, and the dead-layer concept, together with its role in low-energy response, is critically examined. The potential of other spectrometer types including high-purity germanium detectors and diffraction spectrometers is briefly considered.
The accuracy attainable in micro-PIXE analysis is assessed in terms of the X-ray production model and its assumptions, physical realities of the specimen, the necessary data base, and techniques of standardization. NT...
The accuracy attainable in micro-PIXE analysis is assessed in terms of the X-ray production model and its assumptions, physical realities of the specimen, the necessary data base, and techniques of standardization. NTIS reference materials are analyzed to provide the experimental tests of accuracy.
This paper presents a study of the electric field induced migration of Ga and Sb ions during anodic oxidation of Al films on GaSb. Rutherford backscattering spectrometry was used to examine the composition and thickne...
详细信息
This paper presents a study of the electric field induced migration of Ga and Sb ions during anodic oxidation of Al films on GaSb. Rutherford backscattering spectrometry was used to examine the composition and thickness of the anodic oxides. Oxide thickening was found to occur at the electrolyte oxide and also at the GaSb oxide substrate interface. It was found that Ga and Sb were mobile under the growth conditions and mobile ions resulted in the formation of a surface GaSb oxide. From measurments of the thickness we are able to report on the transport number for the anion and cations in this system. The growth of the surface GaSb oxide is discussed with reference to the intrinsic oxide growth rates in the Al and GaSb.
The empirical response function introduced by Cole and Davidson for the analysis of dielectric relaxation in the frequency domain has been used in an analogous way to reanalyze ionic conductivity relaxation using the ...
详细信息
The empirical response function introduced by Cole and Davidson for the analysis of dielectric relaxation in the frequency domain has been used in an analogous way to reanalyze ionic conductivity relaxation using the electric modulus representation. The fitting of data for ionic relaxation in AgPO3, 0.1AgI‐0.9AgPO3, and 0.4Ca(NO3)2‐0.6KNO3 originally fit using a Kohlrausch–Williams–Watts response function has been considerably improved.
A symmetric on-demand beam deflector for use in conjunction with particle microbeams is described. Tests of the device in a micro-PIXE system with a 3 μm width beam indicate that the position and dimensions of the mi...
A symmetric on-demand beam deflector for use in conjunction with particle microbeams is described. Tests of the device in a micro-PIXE system with a 3 μm width beam indicate that the position and dimensions of the microbeam are not significantly altered. Measurement of beam charge is accomplished either by conventional integration or by recording RBS spectra from vanes rotating through the beam; careful attention to dead time is necessary in the latter case. In micro-PIXE reduction of specimen damage by the beam deflector is of considerable value.
Herein, it is shown that by exploiting integral definitions of well known special functions, through generalizations and differentiations, broad classes of definite integrals can be solved in closed form or in terms o...
详细信息
Two closely coupled superconducting microbridges have been fabricated with the length of the separating superconducting region less than a coherence length. These microbridges exhibit coupling even when there is zero ...
Two closely coupled superconducting microbridges have been fabricated with the length of the separating superconducting region less than a coherence length. These microbridges exhibit coupling even when there is zero bias potential at each microbridge. The critical current of each microbridge is a function of the bias current of the other microbridge. This type of coupling is explained by a coupling current that is proportional to the sine of the sum of the phases of both microbridges.
暂无评论