Hollow-cathode lamps emit light with very sharp linewidths.Which mechanisms are responsible for broadening atomic emission line widths?
I pressure broadening
II ionization effect
III matrix effect
IV Doppler effect
A)I and IV
B)II,III,and IV
C)I,III,and IV
D)II and IV
E)III and IV

Question

Quizplus · Accepted Answer

Pressure broadening is caused by collisions between atoms or molecules that perturb the energy levels, leading to an increase in the width of the emission line. The Doppler effect arises when the atoms or molecules are moving, resulting in a spread of frequencies around the central frequency of the emission line. The ionization effect and matrix effect are not relevant to broadening atomic emission line widths.

Hollow-Cathode Lamps Emit Light with Very Sharp Linewidths