Absorption Napierian linear coefficient

Table 2.28 summarizes literature data on the absorption coefficients of hydroxyls on sUica and zeolites. The most commonly used dimension is cm pmoP. The decadic absorption coefficient is more prevalent than the Napierian and is usually used in IR spectroscopy. In older references, one can encounter that the linear intensity was analyzed and the absorption coefficient was expressed in cm pmol. To avoid any confusion, we shall not present such data here. 

The term Bouguer-Lambert law is not familiar to many spectroscopists. The term Beer-Lambert law or merely Beer s law is frequently used in its place. Technically, Beer s law refers to the observation that the contribution of an absorber to the absorbance of a sample is proportional to the concentration of the absorber. The symbol k is referred to by some spectroscopists as the Beer-Lambert absorption coejficient. Because of the possibility of decadic or napierian absorbance and the various units by which concentration can be expressed, several different quantities are all Beer-Lambert absorption coefficients. The term absorptivity is commonly used in equations for decadic absorbance and can include concentration in any rmits. The term linear absorption coefficient is the usual name for the linear napierian absorption coefficient of a pure material. 

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