Converting pixels into reciprocal spacings

When presenting X-ray reflection features, you may want to plot them in reciprocal space since the raw pixel numbers do not mean anything. See example below

Ma et al. Int. J. Mol. Sci. 2018, 19, 2643. https://doi.org/10.3390/ijms19092643

The equation is:

Where:

Pixel size will be detector-dependent. (check the specs first)

X is raw spacing in pixel you want to convert

λ is the wavelength of the X-ray used. At 12 Kev, the wavelength is 0.1033nm

SD is the sample to detector distance.

It is important to have the parameters in the right units