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Technique Of Organic Chemistry Vol. IX
The apparatus for the study of organic compounds by physical methods
and its use have been discussed in Volume I of this series. In many of these
methods the experimental data are readily interpreted and can be effec-
tively utilized in the solution of chemical problems with no more theoreti-
cal information than could be incorporated in the chapters on the respec-
tive methods. In other methods, in order to make the transition from the
experimental facts to the underlying causes, some acquaintance is required
with a body of theory much too complex and extensive to be included in a
volume devoted essentially to apparatus and experimental procedure.
Such is the case in the applications of spectroscopy in organic chemistry;
the description of spectroscopic apparatus and the theoretical discussions
necessary for the proper use of the instruments leave little space in the
practical manuals for more than a cursory treatment of spectra in them-
selves. The present volume has been designed to fill this gap, by serving
as an introduction to the interpretation of the spectra of organie substances
over the spectral region extending from microwave to ultraviolet radiations
An effort has been made to render the treatment comprehensive. How-
ever, the authors have devoted relatively little space to topics already
extensively covered in the book literature, and have concentrated mostly
on less readily accessible material. Most of the chapters are concerned
almost entirely with the theory of spectra and the interpretation of experi-
mental observations, but certain experimental procedures have been dis-
cussed when the authors felt it desirable.
An understanding of the spectra of polyatomic molecules necessitates
some knowledge of the spectra of atoms and diatomic molecules. The
literature on these subjects is extensive, but, with the object of making the
volume as self sustaining as possible, the nomenclature and symbolism of
the quantum numbers of atoms and linear molecules, along with their
physical significance, have been surveyed in an introductory chapter.
This chapter also provides a general view of the nature of molecular spectra,
as a preliminary to the study of the more complete treatments in the sub-
sequent chapters.
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