XRD patterns from a standard polycrystalline gold ﬁlm, collected by a parallel beam goniometer equipped with a conventional cross-slits collimator were compared with those obtained by replacing the incident beam optics with a multicapillary collimator. Considerable improvements can be achieved by using the new optics: (a) a much higher fraction of the X-ray beam produced by a conventional sealed tube can be used to build the diffracted signal, provided that a sufﬁciently wide sample area is available for measurement (diameter> 1 mm); (b) the limited beam divergence (=0.3°) gives a good stability and precision, in terms of negligible systematic errors in peak position due to sample psi- and omega-tilting; (c) instrumnental proﬁles are much narrower than those obtained by the conventional cross-slits collimator; (d) width and shape of the instrumental proﬁle are ahnost unaffected by sample tilting. The considerable interest in this device is increased by considering that features (b), (c) and (d) were veriﬁed also for relatively low 26 angles (30-40°): this is of great importance for thin ﬁlm studies, where most of the available information comes from low diffraction order proﬁles; in addition, the increased signal intensity greatly helps to reduce measurement time (or to improve statistics). Advantages and drawbacks of the new optics are described in this paper, together with some practical examples of use.
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|Titolo:||Multicapillary optics for materials science studies|
|Autori:||Scardi, Paolo; Setti, Sergio; Leoni, Matteo|
|Titolo del volume contenente il saggio:||European Powder Diffraction 6|
|Luogo di edizione:||Svizzera|
|Casa editrice:||TTP Trans Tech Publications|
|Anno di pubblicazione:||2000|
|Codice identificativo Scopus:||2-s2.0-0000738146|
|Codice identificativo ISI:||WOS:000088849300026|
|Appare nelle tipologie:||04.1 Saggio in atti di convegno (Paper in proceedings)|