以下为句子列表：
英文: Abstract: We have studied theoretically a beat effect in a four-level system due to fifth-order optical polarization,and considered the cases that the pump beams have either narrowband or broadband linewidth.We have found that the accuracy for the energy-
中文: 文摘:研究了四能级系统中基于五阶极化的拍频效应，考虑了抽运光束为窄带线宽或宽带线宽的情形.发现其对能级分裂的测量精度决定于光学跃迁的均匀增宽.也就是说，这种技术在测量与基态是偶极禁戒跃迁的两激发态之间的能级分裂时，可得到消除多普勒增宽的精度.
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