Molar decadic absorption coefficient

Molar absorption coefficient, molar decadic absorption coefficient Absorbance divided by the absorption pathlength, I and the concentration, c ... 

The quantity e is called the absorption coefficient or extinction coefficient, more completely the molar decadic absorption coefficient it is a characteristic of the substance and the wavelength and to a lesser extent the solvent and temperature. It is coimnon to take path length in centimetres and concentration in moles per... 

Magnetic dipole moment of a molecule m, fJL Molar (decadic) absorption coefficient e... 

Figure 1.5 Absorption spectrum of the hydrated electron the ordinate is the molar decadic extinction coefficient (m 1 cmr1)...

All upward radiative transitions in Figure 3.23 are absorptions which can promote a molecule from the ground state to an excited state, or from an excited state to a higher excited state. We have seen that the probability of these transitions is related ultimately to the transition moment between the two states and thereby to the Einstein coefficient A. In practice two other related quantities are used to define the intensity5 of an absorption, the oscillator strength f and the molar decadic extinction coefficient e. 

The molar decadic absorption coefficient e is frequently called the extinction coefficient in published literature. Unfortunately numerical values of the extinction coefficient are often quoted without specifying units the absence of units usually means that the units are mol-1 dm3cm-1. See also [18]. The word extinction should properly be reserved for the sum of the effects of absorption, scattering, and luminescence. 

Molar (decadic) absorption coefficient L moF cm Molar (decadic) absorption coefficient m mol 0.1 -... 

The relation between the absorption cross section and the molar (decadic) absorption coefficient, e, (units cm ) is... 

The quadratic effect of an externally applied field on the absorption coefficient is described by the imaginary part of the third-order susceptibility -o) a),0,0). influences the molar decadic absorption coefficient of the solute. The absorption coefficient in the presence of the field is a quadratic function of the applied field strength (118),... 

Here, A is the (decadic) absorbance e represents the molar (decadic) absorption coefficient, customarily expressed in dm /mol cm, equivalent to 1000 cm /mol c stands for the concentration in mol/dm and I for the thickness of the sample in cm. These definitions are not strictly in accordance with SI standards. Nevertheless, they are used in this book, because millions of data in these units are published. The transmittance or transmittance factor is given by r = /[Pg.17]

In these equations, d is the sample thickness, e is the molar decadic absorption coefficient and c stands for the concentration. For pure samples, e-c should be replaced by a, which is the linear decadic absorption coefficient of the sample. For a black body radiator, the emission factor is ejf = 1. 

Actually existing emitters are not black bodies. More realistic values may be calculated according to the Planck-Kirchhoff law, Eqs. 3.3-4 to 3.3-8. Table 3.4-4 shows typical molar decadic absorption coefficients for infrared absorption bands of character-... 

Table 3.4-4 Infrared molar decadic absorption coefficients e. for vibrations of typical organic molecules (Jones and Sandorfy, 1956)...

Decadic molar absorption coefficient of the species X r the warvekngth 5, (liter mol 1 cm 1)... 

Point (a) is best optimised by experiment, although several attempts have been made to provide a theoretical basis for determining the optimum concentration of a species of known molar decadic absorption coefficient for resonance Raman studies. The deleterious effects on the signal-noise ratio of the Raman spectram attributable to point (b) can be obviated by spinning the sample at ca. 1600 rev min as a solid, liquid or gas. Several articles contain details of many of these devices, the common object of which is to ensure relative motion between the sample and the focused laser beam (64). Surface scanning devices are also in use, and these enable the laser beam, while remaining focused on the surface of the sample, to scan over its surface in either a circular or linear fashion to achieve the same object. Such a procedure is particularly effective when the sample is held at liquid nitrogen temperatures. A device which allows this mode of operation is shown in Fig. 10 in this case the laser beam... 

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