The sample needs to be atomized in order to analyze it. Atomization can occur with a number of different types of atomizers including flame atomizers and graphite atomizers, which are electrothermal. After atomizing, the atoms need to be irradiated with optical radiation. The radiation will then pass through the monochromator, which will separate the radiation types and isolate the element specific radiation, in order to help the user determine what is present in the sample.