The material covers the generation of radiation in the wavelength range 10-2000 pn (frequency 1000-5 cm-'), thus embracing traditional incoherent far-infrared radiation sources as well1 as microwave generators and low frequency optical lasers, optical and microwave transmission systems, detectors, cyclotron resonance, plasma theory and finally a long section on the theory of rotational, vibrational and electronic absorption and scattering spectra.The experimental chapters constitute about three-quarters of the book and represent a state of the art description of the field up to 1972. Microwaves are understandably treated in less detail but then little useful could probably have been added to the classic text of Townes and Schawlow. As the main subject matter of the text is one of intense research activity the text is rapidly dating, but will still represent a useful source of information for some years to come. In one section an untried interesting electron cyclotron resonance method of radiation detection is proposed and analysed in detail.The section on spectral interpretation is too brief to be other than a useful summary of basics suitable for teaching purposes. For instance, only 40 pages are devoted to rotational and vibrational spectra, which are covered far more adequately in numerous other texts, such as Townes and Schawlow, or Allen and Cross, and seem rather inappropriate here. The theory of magnetic resonances is less frequently discussed in standard text books and a summary of this theory is more appropriate to the main theme.It is slightly confusing at times to have frequencies quoted in Hz, then in cm-', in the same page in which wavelengths (pm) are used. Few errors were noted. The text is not written in a fashion conducive to undergraduate study and must be considered largely a reference text for graduate students and other research workers.
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