The presence or absence of sharp peaks in the diffraction graph of pure anthracene derivative versus thin films can be influenced by various factors. what are some potential reasons for the observed differences. There is sharp peak in the diffraction graph of pure anthracene derivative but not in the thin films are synthesised
Diffraction peaks are caused by long range order. Anything that repeats with a fixed spacing over a large region of the coherent beam will produce a peak. The shorter the distance over which the spacing is constant (coherence length) the weaker the peak. Similarly, the shorter the distance over which the probe beam is coherent the weaker the peak.
SO, the lack of any peaks is either an indication of no long range order (your sample has very small crystals or is amorphous) or very poor coherence of the probe beam (not sufficiently monochromatic or well collimated / diffraction limited).
Usually it isn’t the beam. If you get nice diffraction peaks from a different kind of sample, (one you know is crystalline) then it’s definitely your sample, and you have failed to grow crystal grains with sufficient size.
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