ABSTRACT
Raman effect is the scattering of a photon in a gas. Raman scattering can occur with a change in vibrational, rotational or electronic energy of a molecule. The reduction in gas volume indicates the quantity of oxygen absorbed by the pyrogallol. There are multiple methods of measuring the concentration of oxygen in a gas mixture and it is essential to understand the principles behind each method. The different methods are: Clark polarographic electrode; galvanic fuel cell; paramagnetic O2 analyser; mass spectrometer; photoacoustic spectroscope; Raman spectroscope; and chemical. Silver/silver chloride anode and platinum cathode are suspended within a potassium chloride solution. Both are covered by an oxygen permeable membrane. O2 is a paramagnetic gas, which means that it is attracted towards a magnetic field because it has unpaired electrons in its outer shell.
