It is ordinarily quadratic in the electric field, although it  can be linear when there is a permanent electric dipole moment.  First observed by the German scientist for whom it is named as a  splitting of the Balmer lines in hydrogen, it is the electric  analogue of the Zeeman effect. FTP, what is this effect, which  earn
It is ordinarily quadratic in the electric field, although it  can be linear when there is a permanent electric dipole moment.  First observed by the German scientist for whom it is named as a  splitting of the Balmer lines in hydrogen, it is the electric  analogue of the Zeeman effect. FTP, what is this effect, which  earned its discoverer, later a prominent Nazi, the Nobel Prize for  Physics in 1919?
It is ordinarily quadratic in the electric field, although it  can be linear when there is a permanent electric dipole moment.  
{Stark} effect