X-ray crystallography elastic X-ray scattering include powder diffraction, Small-Angle X-ray Scattering (SAXS) and several types of X-ray fiber diffraction, which was used by Rosalind Franklin in determining the double-helix structure of DNA. In general, single-crystal X-ray diffraction offers more structural information than these other techniques; however, it requires a sufficiently large and regular crystal, which is not always available. These scattering methods generally use "monochromatic" X-rays, which are restricted to a single wavelength with minor deviations. A broad spectrum of X-rays (that is, a blend of X-rays with different wavelengths) can also be used to carry out X-ray diffraction, a technique known
Francis Crick of the importance of her experimental results in Watson and Crick's model building and theoretical analysis, Franklin should have had her name on the original Watson and Crick paper in "Nature". Franklin and Gosling submitted their own joint 'second' paper to "Nature" at the same time as Wilkins, Stokes, and Wilson submitted theirs (i.e. the 'third' paper on DNA). Watson's portrayal of Franklin in "The Double Helix" (written after Franklin's death when libel laws did not apply anymore) was negative and gave the appearance that she was Wilkins' assistant and was unable to interpret her own DNA data. The X-ray