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• W1992240427 abstract "Nanometric Ni wires and I collagen fibres set across holes of Lacey carbon microscope grids have been observed in a lensless point projection field-emission microscope operating between 100 and 300 eV. At sufficiently high magnification specific fringe patterns appear in both of the two cases. With the help of simulations we show that both cases are strongly dependent on the electric charge density of the observed objects. In the case of Ni nanowires we show that the effect of the remanent magnetization on the electron beam is masked by electric charge of residues of polycarbonate track etched membrane. In the case of collagen these patterns are characterized by an odd number of fringes with a central fringe that becomes very bright as the charge increases. The fringe pattern masks the fitting of the collagen molecules and it is necessary to take into account the charge effect in order to interpret this diffraction pattern. With remarkable precision, from these two examples an average diameter and a linear charge density have been obtained by the analysis of the fringes. The limits of the models used for the simulations and those of the data acquisition system are discussed. Finally we emphasize the fact that the interpretation of the point projection images is delicate despite a very simple experimental scheme. The results may be considered as especially important, in particular in so far as the observation of biological objects is concerned, as this may become the major application of point projection microscopy." @default.
• W1992240427 created "2016-06-24" @default.
• W1992240427 creator A5017640732 @default.
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• W1992240427 date "2001-04-04" @default.
• W1992240427 modified "2023-09-25" @default.
• W1992240427 title "Charge effect in point projection images of Ni nanowires and I collagen fibres" @default.
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• W1992240427 doi "https://doi.org/10.1088/0022-3727/34/8/307" @default.
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