Analytical Chemistry

spectrometry due to their simplicity, freedom from interferences and excellent precision. Fluorimetry is used much less extensiv ...

4000 cm–^1 (2.5– 40 μm), although some occur between 4000 cm–^1 and the beginning of the visible region at about 12500 cm–^1 (0. ...

σe denoting the equilibrium vibration frequency and χe the anharmonicity constant. This expression may be used to predict the ap ...

where f is the force constant of the bond and μ the reduced mass, given by (m 1 m 2 )/(m 1 + m 2 ). It is important to note that ...

Figure 9.14 Classical analogy of polyatomic molecule. can be considered as approximating to a diatomic molecule A–X, and the wav ...

Table 9.6 Wavenumbers of characteristic vibrations (a) X—H Vibrations X—H Stretch/cm–^1 Bend/cm–^1 C—H 2700 – 3300 1200 – 1500 6 ...

that are observed when comparing similar but not identical compounds. Predictable shifts occur on altering the substituents or s ...

Coupled Vibrations Groups in which two or more atoms of an element are bonded to a common atom are mechanically coupled resultin ...

Table 9.8 Simplified infrared spectral correlation charts (table continued on next page) ...

Contd. Table 9.8 ...

Figure 9.17 Infrared spectrum of n-decane. CH 2 and CH 3 groups. It should be noted that no bands are observed above 3000 cm–^1 ...

Figure 9.18 Infrared spectrum of 1,2-dimethylbenzene. stretching band at ~ 3350 cm–^1 is broadened by hydrogen bonding whilst th ...

Figure 9.20 Infrared spectrum of n-propyl alcohol. Figure 9.21 Infrared spectrum of n-undecanal. Figure 9.22 Infrared spectrum o ...

Figure 9.23 Infrared spectrum of n-propyl acetate. 3000 cm–^1 ), skeletal and overtone bands between 1400 and 2000 cm–^1 and a C ...

and to construct a baseline (Figure 9.25) for all standards and samples. The baseline absorbance is measured at the point where ...

sides of an optically flat thin prismatic crystal of thallium bromide/iodide (KRS-5) through which radiation from the source is ...

Figure 9.26 (a) Typical NIR spectrum of ground wheat. (b) NIR spectra of a chiral pharmaceutical compound. 282, 356) and chemome ...

of this text. Unknowns can be identified by matching their spectra with stored library spectra, by a process of pattern recognit ...

bags and blister packs can be done rapidly using library search routines simply by placing the container in a specially designed ...

nucleus also possesses angular momentum I and for each isotope the relative values of μ and I determine the frequency at which e ...