Among several kinds of image streaking observed in field-ion micrographs a particular type is attributed to asymmetric specimens (Ranganathan et al. 1965). Brandon (1966) has proposed a model for this type of streaking which has been further discussed by Ralph and Bowkett (1966). Electron micrographs of asymmetric specimens show that the streak contrast in the field-ion image is often associated with surface irregularities introduced by the electrochemical specimen preparation.
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Loberg et al. (1967) studied this question.
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