Strandberg, Malcom W. P.

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V. MICROWAVE SPECTROSCOPYProf. M. W. P. Strandberg B. Josephson, Jr. I. H. Solt, Jr.Dr. D. Kivelson J. D. Kierstead P. R. Swan, Jr.J. G. Ingersoll S. Krongelb G. J. WolgaM. PeterRESEARCH OBJECTIVESThe work of this group is, in broad terms, the study of the energy states of, and theinteractions between, the elements of systems of atoms in vapor, liquid, and solid. Theexperimental techniques employed for the most part are radiofrequency spectroscopictechniques, mainly in the microwave region. Probably the best justification of the title"Microwave Spectroscopy" is that the experimental techniques are such a highly special-ized application of admittedly universal ideas.While this is so, most of the contributions of the group are in the field of applicationand interpretation rather than in apparatus development, although some of the latter mustnecessarily be carried on. Work in this apparatus development now in progress is onthe observation of microwave resonant absorption of radiation propagating transverseto a molecular beam. Such observations allow us to eliminate the usual Doppler andpressure broadening, so that microwave spectroscopy techniques can possess the almostunlimited resolution long available with conventional molecular-beam deflection appara-tus. We have also done some work in developing methods of stabilizing and measuringmicrowave sources with an accuracy consistent with this new resolving power whichshould be available with beam operation.The apparatus will be of great use for many applications requiring high resolution,though at present it is being tried with the well-known 1. 3-cm ammonia absorption.Work is continuing in the study of the general field of internal rotation in molecules.The attempt here is to better understand the observed perturbations of the rotationalspectra of these internal rotational states; to understand the source of internal hinderingpotential and the effect of excited torsional states on the observed molecular geometry.Work on liquids and solids is being carried out through the observation of para-magnetic states. The application of the observation of paramagnetic spectra to thestudy of the solid state is still quite undeveloped. For this reason we plan, for thepresent, to exploit the novel applications of this powerful research tool.M. W. P. Strandberg-18-

Microwave Spectroscopy

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Microwave Spectroscopy

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