Stark effect : The splitting of spectral lines under the influence of electric field is called stark effect Raman Effect : When light of frequency $v_{0}$ is scattered by molecules of a substance which have a vibrational frequency of $v_{1}$ , the scattered light when analysed spectroscopically has lines of frequency $v$ where
$v =v_{0} \pm v_{0}$ Zeeman Effect : The splitting of spectral lines under the influence of magnetic field is called Zeeman effect Rutherford Effect : According to Rutherford on the bombordment of the atoms by high speed $\alpha$ particles, the centre of the atom scatteres the $\alpha$-particles.