Two types of shape resonances in the compounds AIBiS2 (AI=Li, Na)

Inverse problem in the theory of many-centre shape resonances

“…The many-well model has been applied recently for analysis of resonances in the molecules Nz, O2 and SF6 (Migal 1990(Migal , 1991 and the solid compounds LiBiS, and NaBiS, (Lavrentyev et al 1992). It has been shown that to obtain a semi-quantitative coincidence with an experiment one can choose the well depths in the following way.…”

Na1.88Bi1.88S4 and Na1.36Ca1.28Bi1.36S4 Single Crystals: Growth, Structure and Optical Property

“…For decades, researchers have shown great interests in exploring group VA chalcogenides, because the compounds of group VA chalcogenides had been found to have various interesting properties and promising applications in the fields including photocatalyst (BiOCl [1] ), thermoelectric (Bi 2 Te 3 [2] ), superconductivity (LaO 1-x F x BiS 2 [3] , Bi 4 O 4 S 3 [4] , and Bi 3 O 2 S 3 [5] ), and topologic physics (Sr x Bi 2 Se 3 [6] ). Compared with most of other chalcogenides of group VA with common layered structure, the MBiQ 2 (M=Li, Na and K; Q=S and Se) compounds [7][8][9][10] have a rare NaCl-type cubic structure, which are isomorphous with AgBiSe 2 [11] , in which alkali metal and bismuth atoms disorderly occupy the 4a sites, and the sulfur or selenium atoms occupy the 4b sites. Structural information of MBiQ 2 compounds were only solved from powder X-ray diffraction data.…”