Adsorption may occur via physisorption and chemisorption. The adsorption of nitrogen is similar to the chemisorption of carbon monoxide. Figure 1 is a graph of physisorption and chemisorption energy curves of tungsten and oxygen. The dissociative chemisorption of TMA leaves a surface covered with AlCH. Alternatively, the binds to solid sorbent in the process of chemisorption. This property is known as chemisorption. These trapped holes allow photo-excited electrons to be available for chemisorption. Two types of adsorption are recognized&colon; physisorption, weakly bound adsorption, and chemisorption, strongly bound adsorption. The particle diffuses on the surface until it finds a deep chemisorption potential well. The molecule then diffuses across the surface to the chemisorption sites. Typical energies for chemisorption range from 20 to 100 kcal/mol. The bond between the adsorbate and adsorbent in chemisorption is either ionic or covalent. Some corrosion inhibitors form a passivating coating on the surface by chemisorption. Physisorption is given as a Lennard-Jones potential and chemisorption is given as a Morse potential. However, chemisorption is very difficult to theorize.