Dark Field Imaging
In dark field imaging (also termed diffraction contrast imaging) researchers adjust the excitation of the objective lens so as to produce an image of the diffraction pattern in the middle of the beam separator and choose a desired spot intensity to image using a contrast aperture inserted there. This aperture allows scientists to image diffraction intensities that may be of particular interest (dark field). For instance, if a researcher wants to map out the origin of some particular diffraction intensity, dark field analysis allows one to image (in real-space) where the particular intensity originates from.
Read more about this topic: Low-energy Electron Microscopy, Specialized Imaging Techniques
Famous quotes containing the words dark and/or field:
“Later you hear it wander the dark house
Like a mother who rises at night to seek a childhood picture;
Or it goes to the backyard and stands like an old horse cold in the
pasture.”
—Robert Penn Warren (1905–1989)
“In the field of world policy I would dedicate this Nation to the policy of the Good Neighbor—the neighbor who resolutely respects himself and, because he does, respects the rights of others—the neighbor who respects his obligations and respects the sanctity of his agreements in and with a world of neighbors.”
—Franklin D. Roosevelt (1882–1945)