### Synopses & Reviews

Two Nobel Laureates present a systematic, comprehensive account of the theory, techniques, experimental data, and interpretation involved in the study of microwave spectroscopy — a subject relevant to nuclear physics, molecular structure, chemical kinetics, quantum electrodynamics, and astronomy.

The material in this volume is discussed critically, systematically, and in the simplest form. The simplicity of the wording and mathematics makes most of the contents accessible to those with a very elementary knowledge of quantum mechanics and atomic physics. Although the treatment is continuously developed, each of the 18 chapters is self-contained. Nearly 200 tables and figures augment the text. Appendixes supply most of the background for research and interpretation of microwave spectra; they also contain extensive data on nuclear and molecular constants, including essentially all those determined by microwave techniques. "Equally suitable for use as a fundamental reference or advanced textbook." — *U.S. Quarterly Book Review.*

#### Synopsis

From two distinguished scientists: a systematic, comprehensive account of the theory, techniques, experimental data, and interpretation involved in the study of microwave spectroscopy. The book is divided into 18 chapters on key topics that may be read individually or serially as a continuous work, making it an ideal reference as well as a textbook. With 190 tables and figures.

#### Synopsis

Nobel Prize winner Townes and noted scientist Schawlow give systematic, comprehensive account. Fundamental work, reference book. 190 tables and figures.

#### Synopsis

Two Nobel Laureates present a systematic, comprehensive account of the theory, techniques, experimental data, and interpretation involved in the study of microwave spectroscopy. Ideal as reference or text. 1955 edition.

#### Synopsis

Two Nobel Laureates present a systematic, comprehensive account of the theory, techniques, experimental data, and interpretation involved in the study of microwave spectroscopy. Eighteen self-contained chapters on key topics may be read individually or serially, making this volume ideal as a reference as well as a textbook. 190 tables and figures. 1955 edition.

### About the Author

Charles Hard Townes has taught at Columbia University, MIT, and the University of California, Berkeley. In addition to his 1964 Nobel Prize in Physics for his work in quantum electronics, he has been awarded the Templeton Prize and 27 honorary degrees.

Arthur Leonard Schawlow (1921-1999) is best remembered for his work with lasers. He shared the 1981 Nobel Prize in Physics for his contributions to the development of laser spectroscopy.

### Table of Contents

Preface List of Symbols Introduction 1. Rotational Spectra of Diatomic Molecules 2. Linear Polyatomic Molecules 3. Symmetric-top Molecules 4. Asymmetric-top Molecules 5. Atomic Spectra 6. Quadrupole Hyperfine Structure in Molecules 7. Molecules with Electronic Angular Momentum 8. Magnetic Hyperfine Structure in Molecular Spectra 9. Interpretation of Hyperfine Coupling Constants in Terms of Molecular Structure and Nuclear Moments 10. Stark Effects in Molecular Spectra 11. Zeeman Effects in Molecular Spectra 12. The Ammonia Spectrum and Hindered Motions 13. Shapes and Widths of Spectral Lines 14. Microwave Circuit Elements and Techniques 15. Microwave Spectrographs 16. Millimeter Waves 17. Frequency Measurement and Control 18. The Use of Microwave Spectroscopy for Chemical Analysis Appendix I. Intensities of Hyperfine Structure Components and Energies Due to Nuclear Quadrupole Interactions Appendix II. Second-order Energies Due to Nuclear Quadrupole Interactions in Linear Molecules and Symmetric Tops Appendix III. Coefficients for Energy Levels of a Slightly Asymmetric Top Appendix IV. Energy Levels of a Right Rotor Appendix V. Transition Strengths for Rotational Transitions Appendix VI. Molecular Constants Involved in Microwave Spectra Appendix VII. Properties of the Stable Nuclei (Abundance, Mass, and Moments) Bibliography Author Index Subject Index Fundamental Constants and Conversion Factors