The frequencies of low-lying electronic excitations in the quasi-one-dimensional antiferromagnet CsFeCl₃ · 2H₂O were determined by Raman spectroscopy. The lowest of them (57 cm⁻¹) was attributed to the magnon-like excitation of the chain of Ising spins of paramagnetic Fe²⁺ ions. And the next one (77 cm⁻¹) can most likely be attributed to the exciton-like one, associated with the electronic transition to the lower level of the excited orbital quasi-doublet d_zx, d_zy split by the spin-orbit interaction. Investigations of the splittings and shifts of Raman lines in an external magnetic field allowed us to estimate the values of the magnetic moments of the sublattices in the ground state and to determine their spatial orientation relative to the crystallographic directions.

中文翻译：

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通过拉曼光谱研究准一维Ising反铁磁体CsFeCl3·2H2O中的低能电子激发

准一维反铁磁体CsFeCl ₃  · 2H ₂ O中的低位电子激发频率由拉曼光谱确定。它们中最低的（57 cm ^-1）归因于顺磁性Fe ²⁺离子的Ising自旋链的类磁振子激发。下一个（77 cm ^-1）很可能归因于类激子，与电子跃迁到受激轨道准双线态d _zx , d _zy的较低能级有关由自旋轨道相互作用分裂。对外部磁场中拉曼线的分裂和位移的研究使我们能够估计基态亚晶格的磁矩值，并确定它们相对于晶体学方向的空间取向。