In this site we focused on the the areas of science incluod analytical chemisty, general chemistry, inorganic chemistry, organic chemistry, physical chemistry, and spectroscopy.(Online Chemistry Dictionary )

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Types of spectroscopy

Types of spectroscopy:

 (a) Continuous spectroscopy 
(b) Absorption spectroscopy 
(c) Emission spectroscopy 
Types of spectroscopy:      (a) Continuous spectroscopy   (b) Absorption spectroscopy   (c) Emission spectroscopy

The absorption spectroscopy means that we observe the spectrum of the light right after it go through the substance, (look at the pic.) black line means the photons which have those specific kind of energy were absorbed by the substance; 
emission spectrum means the range of electromagnetic spectra in which a substance radiates (emits). The substance first must absorb energy. 
This energy can be from a variety of sources. We observe the emission light