| 摘要 |
A novel crystal holder for the wavelength dispersive spectrometers of electron microprobes arranges four crystals as a cylinder segment which may be moved to a position in which it partially encompasses the viewing optics assembly so that low Bragg angle settings may be obtained without mechanical interference, while at the same time the interchanging of crystals by oscillation of the cylinder segment on its axis is possible at any position of the crystal holder.
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