Structural Investigation by Means of Nuclear Quadrupole Resonance II : Tin Tetrabromide

概要

論文の詳細を見る
Details of the universal quadrupole resonance crystal analyzer were described, and using this apparatus the crystal structure of SnBr was studied at room temperature (15°〜20℃). The SnBr_4 molecule is an almost exact tetrahedron, and each of the four resonance lines is assigned to each bromine atom situated at the apexes of the tetrahedron, and the value of asymmetry parameter of the field gradient at the bromine nucleus is less than 0.025. The crystal has monoclinic symmetry and one of the Sn-Br bond in one molecule is perpendicular to the b-axis and the other two orient at the same angle to the b-axis. All atoms including Sn in a molecule have nonequivalent general positions in the crystal, and the number of molecules in a unit-cell is equal to the maximum number of equivalent coordinates of the space-group. The existence of pair of two molecules is suggested, and the origin of the splitting of the spectrum is discussed. SnBr_4 may be assigned to the symmetry class C_<2h>. The crystal symmetry of the low temperature phase is assigned to the cubic or hexagonal class.
社団法人日本物理学会の論文
1957-06-05