Introduction to Infrared and Raman Spectroscopy by Norman B. Colthup

By Norman B. Colthup

Now in its 3rd variation, this vintage textual content covers many points of infrared and Raman spectroscopy which are serious to the chemist doing structural or compositional research. This paintings contains sensible and theoretical methods to spectral interpretation in addition to a dialogue of experimental strategies. Emphasis is given to team frequencies, that are studied in unique discussions, wide tables, and over six hundred conscientiously selected and interpreted spectral examples. additionally featured is a distinct remedy of staff frequencies that stresses their mechanical foundation. This qualitative method of vibrational research is helping to simplify spectral interpretation. extra subject matters contain easy instrumental parts and sampling strategies, quantitative research, Raman polarization info, infrared fuel contours, and polarized IR experiences, between others.

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Extra resources for Introduction to Infrared and Raman Spectroscopy

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23. The hydrogen chloride vibrational-rotational band. The P and R branches are labeled. The Q branch (v0) is missing since àj cannot equal zero for a parallel band of a linear molecule. Each rotational line is labeled with its rotational quantum number in the ground vibrational state. In this high resolution spectrum each rotational line is a doublet since chlorine has two naturally occurring isotopes. The peaks for H37C1 occur at slightly lower frequencies in cm"1 than the peaks for H35C1 [see Eq.

15 The Anharmonic Oscillator The harmonic oscillator approximation is adequate for most of the features of the spectrum, but some of the finer details such as the appearance of over- 28 INTRODUCTION TO INFRARED AND RAMAN SPECTROSCOPY tones indicate that real molecules have somewhat anharmonic potential functions. 10). A quantum mechanical treatment of the anharmonic oscillator yields the following equation for the energy levels. 43) Higher order terms are usually not needed. 44) Unlike the harmonic oscillator energy levels, these are no longer equally spaced.

The moments of inertia about these three mutually perpendicular axes are designated in order of increasing magnitude as Ia, Ib, and Ic. 5. Linear molecules have /„, the moment of inertia about the molecular axis, equal to zero and Ib equal to Ic, which are the moments of inertia about two axes perpendicular to the molecular axis and to each other. Polyatomic linear molecules and diatomic molecules have identical rotational energy equations. However, pure infrared rotational spectra can only be observed for those molecules which possess a permanent dipole moment.

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