### Zeeman Splitting Method

If the atoms and molecules are permeated by magnetic field , in the normal Zeeman splitting, the transition splits into three lines

 (4.35) (4.36) (4.37)

where is the Bohr magneton constant. This comes from the fact that the upper and lower levels are splited into using the magnetic quantum number . HI cm, OH (maser emissions and thermally excited emissions), HO maser emissions are used to measure the magnetic field strength. Figure 4.4 represents the correlation between the magnetic field strength and gas density compiled by Fiebig & Guesten (1989), which indicates that is approximately proportional to

Kohji Tomisaka 2012-10-03