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Keywords:

  • amino acids;
  • crystal growth;
  • surface analysis

An ordered layer of (S)-methionine is attached to the (010) face of α-glycine when the crystals are brought into contact with a saturated solution of glycine containing (S)-methionine as additive. The direct evidence was obtained by grazing incidence X-ray scattering experiments, which also indicated different behavior for the (010) and (010) faces. The concentration of the surface-bound methionine molecules was determined to be 4:1.