Download Introductory Raman Spectroscopy, Second Edition by John R. Ferraro PDF

By John R. Ferraro

This moment version of Introductory Raman Spectroscopy serves as a consultant to rookies who desire to develop into familiar with this dynamic procedure. Written through 3 said specialists this identify makes use of examples to demonstrate the usefulness of the means of Raman spectroscopy in such various components as forensic technology, biochemistry, scientific, pharmaceutical prescription and illicit medicines. The method additionally has many makes use of in undefined. up-to-date purposes bankruptcy · tested the flexibility and application of Raman spectroscopy in challenge fixing in technological know-how · Serves as a good reference textual content for either newcomers and extra complex scholars · Discusses new purposes of Raman spectroscopy in and study

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Extra resources for Introductory Raman Spectroscopy, Second Edition

Example text

In cases where several axes of rotation exist, the highest order of rotation is chosen as the principal (z) axis. Linear molecules have an infinitefold axes of symmetry (Coo). The selection of the axes in a coordinate system can be confusing. To avoid this, the following rules are used for the selection of the z axis of a molecule: (1) (2) (3) In molecules with only one rotational axis, this axis is taken as the z axis. In molecules where several rotational axes exist, the highest-order axis is selected as the z axis.

In general, the intensity of Raman scattering increases as the {da/dq)Q becomes larger. 9 Depolarization Ratios 27 7. Raman spectra of hygroscopic and/or air-sensitive compounds can be obtained by placing the sample in sealed glass tubing. In IR spectroscopy, this is not possible since glass tubing absorbs IR radiation. 8. In Raman spectroscopy, the region from 4,000 to 50 cm~^ can be covered by a single recording. In contrast, gratings, beam spUtters, filters and detectors must be changed to cover the same region by IR spectroscopy.

3. It is more difficult to obtain rotational and rotation-vibration spectra with high resolution in Raman than in IR spectroscopy. This is because Raman spectra are observed in the UV-visible region where high resolving power is difficult to obtain. 4. The state of the art Raman system costs much more than a conventional FT-IR spectrophotometer although less expensive versions have appeared which are smaller and portable and suitable for process applications (Section 2-10). Finally, it should be noted that vibrational (both IR and Raman) spectroscopy is unique in that it is applicable to the sohd state as well as to the gaseous state and solution.

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