Electrodeless  discharge  lamp  (EDL):   

It  holds  a  few  milligram  amount  of  a volatile components or a volatile compound like as halide, together along with neon or argon, under vacuum in a quartz tube. On the application  of voltage, discharge is generates and  the  gaseous  atoms  are  excited  through  application   of  microwave   field  or  radio frequency of typical  frequency.  As the excited atoms decay to the ground state or to other low energy levels, features radiation of the atom is emitted. The radiations emitted through EDLs are about 10-100 times more intense than for the corresponding HCL.

A source lamp for atomic fluorescence is mounted at an angle to the rest of the optical system, so in which the light detector sees just the fluorescence within the flame and not the light from the lamp itself. That is advantageous to maximise lamp intensity because sensitivity is directly associated to the number of excited atoms that in turn is a function of the intensity of the exciting radiation.

The stray radiations are particularly low along with monochromatic basic sources and although using nonresonance fluorescence lines along with wavelengths differing from in which of the exciting radiation. Therefore, in the case of atomic fluorescence the selectivity is already partly realised through the radiation source delivering the basic radiation.

The electrodeless discharge lamps are available for a number of components. Thus, their performance is not as reliable as of the halogen cathode lamps.