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  • American Institute of Physics (AIP)  (2)
  • 1995-1999  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Optimum event rate for a CCD detector (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 2668-2671 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A simple event-counting technique is considered that can be implemented on detector systems with adjustable exposure times. A single measurement cycle has two steps: exposure and readout. During readout a threshold is used to discriminate against background noise, making it impossible to differentiate between single or multiple events. The actual event rate can be estimated by accumulating the results of repeated measurement cycles, and applying a correction based on the probability for multiple events to occur. By considering the uncertainty in the estimation of the event rate, and assuming a Poisson process, it is shown that optimum exposure requires an average event count per exposure of roughly 1.7. The technique is applied to a high-energy electron-counting system based on a linear CCD photodetector. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145607
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Calculations of the dynamic Debye–Scherrer diffraction patterns for small metal particles (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 2384-2394 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Dynamic diffraction pattern profiles are calculated for randomly oriented aggregates of gold and silver in the size range from 147 to 5083 atoms and at incident electron energies of 40 kV and 100 kV. The Debye–Scherrer diffraction patterns were obtained by combining a series of multislice calculations performed on model particles over a range of orientations. Calculations are performed for both fcc and icosahedral structures. The results show that corrections to the kinematical theory (Debye equation) are more important than predicted by the two-beam theory of Blackman. One calculation, a fcc 923-atom silver aggregate at 100 kV, showed a distortion to the (111) Bragg peak causing it to to shift its center to a higher scattering angle. Scattering corrections to the icosahedral results are less important than for an equivalent sized fcc aggregate and preserve the general diffraction features seen in kinematic calculations. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.469662
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    Paper (German National Licenses)
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