Infrared absorption coefficient defined

Fig. 1. Absorption coefficients of oxyhaemoglobin, deoxyhaemoglobin and water as a function of wavelength. The near-infrared window of tissue is defined as the spectral region between approximately 700 - 900 nm, where the absorption coefficients are at minimal levels...

The near-infrared absorption of simple diatomic molecules is exemplihed by carbon monoxide (Buback et al., 1985). The pure vibrational transitions of the first and second overtone in the gas phase are at 4260 cm and at 6350 cm respectively. Fig. 6.2-1 shows the molar absorption coefficient e at 127 °C and at various densities g between 0.10 and 0.65 g cm g is defined as... 

An infrared absorption band is defined most precisely by plotting the molecular extinction coefficient against the frequency V, The molecular extinction coefficient at the absorption maximum is a very useful quantity to characterize the order of magnitude of the band intensity. 

To express the distance through which the incident infrared radiation passes through the sample, the inverse of the absorption coefficient 1/a is used and denoted by l . The thermal diffusion length is defined by 1 /flg and denoted by Coefficient is related to the thermal... 

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