کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5377327 1389386 2006 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Molecular dynamics in triglycine sulphate by cold neutron spectroscopy
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Molecular dynamics in triglycine sulphate by cold neutron spectroscopy
چکیده انگلیسی
Molecular dynamics of the ferroelectric compound triglycine sulphate (TGS) was studied by quasi-elastic neutron scattering. From among the three glycine molecules forming the unit cell the non-planar GI molecule is responsible for the polarisation which occurs in crystal and for the order-disorder ferroelectric phase transition at Tc = 49 °C. This molecule also shows a complex dynamics much faster than that performed by the other glycine molecules. The key group of this molecule is the amino group that, on one hand, seems to be responsible for the phase transition and, on the other hand, performs motional processes spread on a wide time scale. These motions have been detailed studied by means of different energy resolution windows within the quasi-elastic scattering range. We found that the dynamics of this group develops in a restricted spatial volume and consists in a faster rotational diffusion around the molecular axis of the group and a slower flipping dynamics between two symmetrical positions on both sides of a mirror plane containing the molecular axis of GI molecule.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Physics - Volume 322, Issue 3, 20 March 2006, Pages 323-330
نویسندگان
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