book reviews p u n d s ~rfrperinl interest. The style is that of a highly r~ndnhle,informal wportagr. In the initial chapters there is no discernible gradation in the length or complexity of the discussion, as might he expected if the author had a student reader in mind. The hook clearlvis most suited for the advanced " eraduntc student or postdoctoral chrmist who wishes to hnve rendy r ~ f r r m c ero the basic chemistry and prppnmrwt- methodsfor ihew frequently encountered heterocyclic nuclei. It compares very favorably with monographs of similar f o m a t , such as those hy Paquette and hv Palmer. For those seekine an excellent textbbok for advanced uuder&duate students, this reviewer can strongly recommend that hy J. A. Joule and G. F. Smith, "Heterocyclic Chemistry." John J. Elsch State University of New Ywk at Winghamton Winghamton, New Ywk 13901
In style, the book is neither a treatise, nor a text. I t reads more like a review article. Someone who wants to actually do a caleulation of one of the types described in the hook will not learn haw here. He will have to turn to the original literature, which is adequately cited. There is the usual quota of misprints and minor errors; none of those which I have detected should prove trouhlesome to a reader with the recommended background. Chemists interested in defect related properties such as diffusion, chemical reactions in solids, or catalysis, will find little here to interest them. Those interested in learning about the electronic structure of defects and their spectroscopic properties may find this book a reasonable place t o begin their studies. Robert M. Mazo UniMKsity of Oregon Eugene. Oregon 97403
The HMO-Model and Its Application. Part 3: Tables ol Huckel Molecular Orbitals Edgar Heilbronner and Hans Bock. John
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Wiley and Sons, London, 1976. ii 190 pp. Figures and tables. 16 X 23.5 cm. $19.50
Polnt Defects in Crystals
R. K. Watts, Texas Instruments, Inc., Dallas. John Wiley & Sons, New York, 1977. xi
+ 312 pages. Figures and tables. 16
X 24 cm. $21.95.
h i n t defwts in crystals ore intrrrupt~ons of the regular periodicit). of the crysta. structure involwng only a few atoms, or atomic site%.Thpy are to he d~stinguished fmm extended drfecu, such as d~slocationv or grain boundaries, which involve a great many atoms and are not localized. The title of the volume under review is a bit condensed; the book treats the spectroscopic properties of point defects. For example, transport processes affected by defects are not discussed a t all. The author does make clear, in the preface, the limitations he has imposed upon himself. The first three chapters treat the electronic structure of various kinds of defect from a theoretical point of view: e.g. impurities, excitons, vacancies, localized lattice modes and their interaction with electronic states. Chapter 4, entitled "Defect Chemistry" is a brief introduction to the mass-action treatment of defect concentrations. Chapter 5 discusses experimental methods from the perspective of the kind of information they yield; hardware is not discussed a t all. Chapter 6 is a very brief summary of electronic structure and chemical bonding in nonmetallic crystals. The final four chapters attempt t o illustrate how the preceding material can be applied t o specific defects in specific host crystals. In my opinion, the prerequisites for readine" this hook eainfullv are a thoroueh ,. erad~. uatr course in quantum mechnnie-, and a rhnruugh course in aulid rtate physws. ('[Iriously, theauthor pointr out the fimt of rhcsr requirements in his preface, but not the second. I believe the second is equally important. For example one needs considerable familiarity with hand theory to profit from this hook. ~
A178 / Journal of Chemical Education
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Part 3 in this treatment of the HMO Model consists of data fully specifying solutions of the Hiickel model far the description of numerous pi-electron systems. Not only the eigenvalues and eigenvectars (LCAO coefficients) are presented, hut also bond orders. free valencies. and atom-atom.. bond-atom, and hond-bund ~rrl~rinnb~lirirs. I heze qunntitics hare proved tuartul as in-
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diccr of hondmgstrrngth and r~acr~r.iry.'l'hr tables are reproduced from typescript and considerably reduced in size, hut are clearly described and legible. With parts 1and 2, this volume completes a clear and thorough description of the HMO model, and would be useful in particular to those without the opportunity, time, or inclination to use a digital computer. Perhaps a valuable application of this data would be as a reference point for particular perturbation-molecular-orbital studies of a sequence of compounds related t o one of the many hvdrocarbon skeletons considered bv Heilb;onnrr and h c k . One muit balnnrk thrsc benefits ngninit the considrralrle exlwncr af the three-volume srt. Carl Trindle University of Virginia Chariottewille, Virginia 2290 1
Appllcatlons of MIjssbauer Spectroscopy, Volume I Richard L. Cohen, editor, Bell Lahoratories, New Jersey. Academic Press, New York, 1976. xi 349 pp. Figures and tables. 16 X 23.5 cm. $24.50
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Unlike the recent books on MBsshauer Spectroscopy by T. C. Gihb and by G. M. Bancroft, this is not a textbook, hut a series of review articles by various authors in specialized fields of application, with the stated emphasis on materials science. Basic physics
