Contains reports on three research projects

Adams, N. I., III

Bitter, F.

Davis, S. P.

Lacey, R. F.

Lustig, E.

Murray, G. R., Jr.

Sagalyn, P. L.

Stanley, J. R.

Waugh, J. S.

Young, J. E. R.

DSpace@MIT

V. NUCLEAR MAGNETIC RESONANCE AND MAGNETO-OPTICSProf. F. Bitter Dr. J. S. Waugh G. R. Murray, Jr.Dr. S. P. Davis N. I. Adams III J. R. StanleyDr. P. L. Sagalyn R. F. Lacey J. E. R. YoungE. LustigA. THE HYPERFINE STRUCTURE OF THE 3p LEVEL OF MERCURYAn apparatus has been constructed in which 3100 Mc/sec microwaves act on themercury vapor in a quartz cell in a cavity. Although the transitions between F-levelsinvolve greater frequencies, the required intervals may be calculated from observedresonances in a magnetic field. In a preliminary experiment, transitions between m-levels of even isotopes were observed.P. L. SagalynB. NUCLEAR MAGNETIC RESONANCES IN GASESThe relaxation times observed in nuclear magnetic resonances in gas are a measureof the effectiveness of collisions in producing nuclear reorientation. By observing anuclear resonance in one component of a mixture of gases for various mixtures it ispossible to get information on the relative effectiveness of collisions between differentspecies of molecules in producing nuclear reorientation. The results of observationson H and B resonances in mixtures of H2, BF3, N2, and He are tabulated below.Here, R is proportional to the ratio of the number of reorienting collisions per secondcomputed from observed relaxation times to the number of kinetic theory collisions persecond calculated by using the same collision cross section for all molecules. Since theabsolute value of the observed relaxation time is at present still uncertain, resultshave been normalized: in a pure gas R is taken as 1.Resonance Observed In Collision With RH in H 2  H2 1BF 3  11N 2  2.5He 0.3B 1  in BF 3  BF 3  1N 2  0.8H 2  0.1Note that in both sets of experiments collisions with BF 3 are about ten times aseffective as collisions with H 2 . N. I. Adams IIIN. I. Adams III-16-Spectroscopy Laboratory, M. I. T.(V. NUCLEAR MAGNETIC RESONANCE AND MAGNETO-OPTICS)C. THE OPTICAL PROPERTIES OF ATOMIC VAPORSA technical report on this subject is being prepared. It summarizes the resultsthat are to be expected when a vapor is normally illuminated with radiation in thevicinity of a resonance frequency. In particular, the reflection coefficient, phase shift,and absorption coefficient are computed for small vapor densities. The most promisingtype of experiment under various conditions of total number of atoms available anddensity of atoms available is briefly discussed.F. Bitter, J. E. R. Young-17-

Nuclear Magnetic Resonance and Magneto-Optics

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Nuclear Magnetic Resonance and Magneto-Optics

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