首次在可见光波段采用塞曼调制磁旋转激光光谱技术有效地将磁旋转信号(n+-n-)从激光本底以及高阶磁旋转信号中分离了出来，因而有非常高的测量灵敏度与信噪比以及无吸收本底，同时又可以抑制高转动量子态的跃迁谱线，减少谱线重叠现象，非常适合许多自由基分子的测量。文中给出了这种光谱技术的理论分析，并以NO2分子作为检验对象，由理论模拟计算所得谱线的强度、线型和位相与实测结果符合较好，因此也可以利用这种光谱方法对复杂分子谱线的量子态进行确认。

Zeeman modulation magnetic rotation laser spectroscopy (ZM-MRS) was first used to seperate the magneticc rotation signal (n +-n -) effectively from the laser background and the high order terms of magnetic rotation signal in visible region. It not only has very high sensitivity, high signal to noise ration and no absorption background and also can suppress the rotational spectrum with high quantum number for simplifying complex electronic spectra. In this paper the theoretical analysis of this technique is simulated by computer. The results are fitted well with the experiment. This spectrscopic method is valuable for measuring free radicals and helpful for assignment of molecular spectrum.