为了研究52Cr原子以外其它同位素对铬原子束横向位置分布的影响，采用蒙特卡罗方法对3孔预准直狭缝条件下的1维激光冷却进行了理论分析。由分析可知，在区分52Cr原子和其它同位素条件下，原子束横向位置分布的基底会有所增加，每一部分原子束的特征值也有明显的变化,中心部分原子束中心最大值有9.5%的降低，半峰全宽有2.9%的增加；两侧每一部分原子束的中心最大值有25%的增加，半峰全宽略有增宽。结果表明，其它同位素的区分与否对中心部分原子束的中心最大值和半峰全宽影响很小。

In order to study the effect of isotopes except for 52Cr on the transverse position distribution of Cr atomic beam, simulation was carried out for 1-D transverse laser cooling with a three-aperture pre-collimating slit by means of Monte Carlo method. The results show that isotopes except for 52Cr can make the background increased and affect characteristics of each part of the atomic beam: the central maximum value decreases 9.5% and its full width at half maximum(FWHM)increases 2.9% in the center; while the maximum value increases 25% with little increase of the FWHM in either side. It concludes that the existence of the isotopes except for 52Cr has little effect on the center maximum value and FWHM of the center part atomic beam.