Zeeman effect of the rotational spectrum of methanol has been measured in a magnetic field of 7.0 kG produced by rectangular bar magnets of neodymium. Thirty low J, K (J ≤ 10, K ≤ 3) rotational transitions, including those in the excited torsional states, were observed. Their Zeeman effect splittings were measured with uncertainties of about 5%, and the four diagonal elements of the rotational g tensor, including the effect of internal rotation of the methyl group, were determined. Using this g tensor, the g factors of low J, K levels can be calculated with an uncertainty of about 5%. They allow us to calculate Zeeman shifts of rotational transitions of methanol observed in interstellar space.

甲醇的旋转光谱的塞曼效应已经在钕矩形条形磁铁产生的7.0 kG磁场中进行了测量。三十低Ĵ，ķ（Ĵ  ≤10，ķ  ≤3）的旋转转换，其中包括那些在激发扭转状态，观察到。测量了他们的塞曼效应分裂，不确定度约为5％，并确定了旋转g张量的四个对角元素，包括甲基内部旋转的影响。使用这个g张量，低J，K的g因子可以计算出大约5％的不确定度。它们使我们能够计算在星际空间中观察到的甲醇旋转跃迁的塞曼位移。