Radial Distribution Function for HCP and FCC lattices

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Images illustrating the differences in radial distribution functions for hexagonal close-packed (hcp) and face-centered cubic (fcc) lattices are sought for reference. While the ideal c/a ratio suggests no difference, real metals often deviate from this, with cobalt being a possible exception. The discussion highlights the variability of histograms across different metals and alloys. A spreadsheet is mentioned that can aid in predicting diffractogram peaks for simple lattices, emphasizing the need to use the direct metric tensor for efficiency. This tool could significantly reduce the time required for analysis.
thepopasmurf
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I was wondering, does anyone have any images that show the difference between the radial distribution functions for hcp and fcc lattices? I would be useful for reference purposes.
 
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thepopasmurf said:
I was wondering, does anyone have any images that show the difference between the radial distribution functions for hcp and fcc lattices? I would be useful for reference purposes.
With the ideal ratio c/a, surely no difference.
But no real metal has this ideal ratio when hexagonal. Maybe cobalt ?
So as many histograms as metals - and alloys...

Maybe you can adapt the speadsheet I made for predicting the diffractogram peaks for any simple lattice, here for chlorite :
http://deonto-ethics.org/resources/chlorite.xls
The main adaptation you have to do is to use the direct metric tensor, rather than the reciprocal metric tensor.
It will save you hours and hours of work.
 
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Thread 'Unexpected irregular reflection signal from a high-finesse cavity'

I am observing an irregular, aperiodic noise pattern in the reflection signal of a high-finesse optical cavity (finesse ≈ 20,000). The cavity is normally operated using a standard Pound–Drever–Hall (PDH) locking configuration, where an EOM provides phase modulation. The signals shown in the attached figures were recorded with the modulation turned off. Under these conditions, when scanning the laser frequency across a cavity resonance, I expected to observe a simple reflection dip. Instead...
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