Jaccarino, V.

King, J. G.

Stroke, H. H.

Molecular Beam ResearchContains reports on two research projects

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Molecular Beam Research

VI. MOLECULAR BEAM RESEARCHProf. J. R. Zacharias Dr. V. Jaccarino J. G. KingProf. B. T. Feld R. T. Daly, Jr. H. H. StrokeJ. H. HollowayA. THIRD ATOMIC BEAM APPARATUSThe operating and measuring instruments were set up in a control panel in prepa-133 134ration for experiments designed to study the hfs anomaly in the isotopes Cs , Cs135 137Cs , and Cs . The radioactive isotopes have already been obtained from the OakRidge Laboratories.The magnet battery power supply is being stabilized for operation of the "C" magnetin the 5500 gauss region necessary in the study of the above isotopes.A stabilized oscillator designed to operate in the region from approximately 1200Mc/sec to 2000 Mc/sec was assembled. A new directional oven, especially well suitedfor the production of beams of radioactive atoms, has been designed and is now underconstruction.A nuclear resonance magnetometer, based on the Pound circuit (1), was built fortransition ("C") field measurements when atomic beam resonances cannot be observed.Proton resonance was observed in the 3500 gauss field of the Harvard permanent magnet.3A signal-to-noise ratio of better than 5 was obtained in the initial test with a 1-cmI-N MnSO 4 sample. No attempt was made at that time to optimize this ratio. Develop-ments are underway at present to permit observation of the resonance signal in the1/4-inch gap of the atomic beam apparatus "C" magnet. The necessary reduction insample volume decreases the signal-to-noise ratio, but the higher magnetic field(5500 gauss) at which the resonance will be observed and the use of Nujol, which has aconsiderably shorter relaxation time (2), as the proton source, will restore partly theoriginal signal-to-noise ratio.V. Jaccarino, H. H. Stroke, J. G. KingReferences1. R. V. Pound, W. D. Knight: Rev. Sci. Instr. 21, 219-225, 19502. N. Bloembergen, E. M. Purcell, R. V. Pound: Phys. Rev. 679-712, 1948-22-

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Molecular Beam Research

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