中文摘要：

拉曼光谱可作为研究分子晶体中分子振动和晶格振动的重要手段。DL-丙氨酸晶体和L-丙氨酸晶体晶胞参数相近，结构上同属于正交晶系，但它们的空间群不同，L-丙氨酸晶体的空间群是P212121，而DL-丙氨酸晶体则是Pna21。前人的工作详细研究了L-丙氨酸晶体的拉曼光谱。文章通过对DL-丙氨酸晶体粉末的拉曼光谱研究，和相同条件下D-和L-丙氨酸晶体粉末的拉曼光谱比较，获得了有关DL-丙氨酸晶体中氢键作用和分子构象的信息。

英文摘要：

Studies of Raman vibration spectra are useful to obtaining information on biomolecular crystals. The cell dimensions of the L- and DL-alanine crystals are nearly identical, and both structures belong to the orthorhombie system, but the space group is P212121 for the L-isomer, and Pna21 for the raeemate crystal. The Raman spectrum of L-alanine has been measured by many authors, The present work is focusing on the Raman scattering study of DL-alanine powder. Based on the analysis of the differences between DL-alanine and L-alanine Raman spectra, the authors obtained indispensable information on hydrogen bond and the motion of the molecular conformation in alanine crystals.