中文摘要：

研究了采用双光子共振非简并四波混频技术测量原子里德伯态碰撞展宽时出现的伴线现象，测量了不同缓冲气压下的钡原子里德伯态6snd^1 D2（n=16，22，36）的四波混频谱线，研究了伴线随主量子数n的变化曲线以及伴线随缓冲气体压强的变化曲线，分析了伴线对NFWM谱线的线宽的影响，发现考虑伴线对四波混频谱线线宽的贡献，可以对NFWM模型下测量到的碰撞展宽系数进行修正．

英文摘要：

We study the satellite lines in measurement of the foreign-gas-induced broadening of the barium Rydberg levels by two-photon resonant nondegenerate four-wave mixing （NFWM）. The NFWM spectra of the 6s2 1S0-6snd 1D2 （n = 16, 22, 36） transitions at different argon pressures are measured. The plots of the center of satellite line versus principal quantum number and pressure are discussed. The contribution of satellite line to the NFWM spectral profile is analyzed. We find that the pressure-broadening rate coefficient can be corrected when the contribution of satellite line is considered.