Electron crystallography

$Electron microscopy image of an inorganic tantalum oxide, with its Fourier transform, inset. Notice how the appearance changes from the upper thin region to the thicker lower region. The unit cell of this compound is about 15 by 25 Ångström. It is outlined at the centre of the figure, inside the result from image processing, where the symmetry has been taken into account. The black dots show clearly all the tantalum atoms. The diffraction extends to 6 orders along the 15 Å direction and 10 orders in the perpendicular direction. Thus the resolution of the EM image is 2.5 Å (15/6 or 25/10). This calculated Fourier transform contain both amplitudes (as seen) and phases (not displayed).$

$Electron diffraction pattern of the same crystal of inorganic tantalum oxide shown above. Notice that there are many more diffraction spots here than in the diffractogram calculated from the EM image above. The diffraction extends to 12 orders along the 15 Å direction and 20 orders in the perpendicular direction. Thus the resolution of the ED pattern is 1.25 Å (15/12 or 25/20). ED patterns do not contain phase information, but the clear differences between intensities of the diffraction spots can be used in crystal structure determination.$

Electron crystallography is a method to determine the arrangement of atoms in solids using a transmission electron microscope (TEM).

单词	Electron crystallography
释义	Electron crystallography 英语百科 Electron crystallography $Electron microscopy image of an inorganic tantalum oxide, with its Fourier transform, inset. Notice how the appearance changes from the upper thin region to the thicker lower region. The unit cell of this compound is about 15 by 25 Ångström. It is outlined at the centre of the figure, inside the result from image processing, where the symmetry has been taken into account. The black dots show clearly all the tantalum atoms. The diffraction extends to 6 orders along the 15 Å direction and 10 orders in the perpendicular direction. Thus the resolution of the EM image is 2.5 Å (15/6 or 25/10). This calculated Fourier transform contain both amplitudes (as seen) and phases (not displayed).$ $Electron diffraction pattern of the same crystal of inorganic tantalum oxide shown above. Notice that there are many more diffraction spots here than in the diffractogram calculated from the EM image above. The diffraction extends to 12 orders along the 15 Å direction and 20 orders in the perpendicular direction. Thus the resolution of the ED pattern is 1.25 Å (15/12 or 25/20). ED patterns do not contain phase information, but the clear differences between intensities of the diffraction spots can be used in crystal structure determination.$ Electron crystallography is a method to determine the arrangement of atoms in solids using a transmission electron microscope (TEM).
随便看	unfurnished的意思 unfurnish的意思 unfurnish的意思 unfurnisht的意思 unfurniture的意思 unfurnitured的意思 unfurred的意思 unfurrow的意思 unfurrowable的意思 unfurrowed的意思 unfurrowing的意思 unfurrows的意思 unfurry的意思 unfurthersome的意思 unfused的意思 unfused chaplet的意思 unfused root的意思 unfused toot的意思 unfusible的意思 unfussed的意思 unfussier的意思 unfussiest的意思 unfussily的意思 unfussiness的意思 unfussy的意思