Contains reports on four research projects

Burke, Bernard F.

Posener, D. W.

Tate, P. A.

Tinkham, M.

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V. MICROWAVE SPECTROSCOPYProf. M. W. P. Strandberg J. G. Ingersoll P. R. Swan, Jr.B. F. Burke J. D. Kierstead P. A. TateC. F. Davis, Jr. D. W. Posener M. TinkhamI. H. Solt, Jr.A. ZEEMAN EFFECTStudy of the Zeeman effect in the water molecule has been substantially completed,with lines of the three isotopic modifications H20, HDO, and D20 having been measured.In all cases the magnetic splitting factor agrees with theory within experimental error.In the case of D 2 0, the identity of the absorption line at 10, 919 Mc/sec, ascribed toD2 0 by D. W. Posener of this laboratory, was confirmed by the Zeeman measure-ments. A detailed report on the work is in preparation.B. F. BurkeB. HIGH-TEMPERATURE MICROWAVE SPECTROSCOPYAfter several unsuccessful attempts to observe absorption lines in KC1 vapor withthe high-temperature microwave spectrograph previously described, the valve in thepumping lead was removed and success was obtained. The KC1 molecular transitionsJ = 2 for v = 0 and v = 1 were observed and measured.Two new high-temperature systems were designed. They both differ from the pre-vious one in that they use a section of waveguide enclosed with the sample in a Vycorcell. In one system the guide is split in a plane parallel to the long cross-sectional di-mension, with upper and lower halves acting as Stark electrodes. In the other a con-ventional Stark septum supported by quartz insulators is used. The first system hasbeen constructed and is ready for testing.P. A. TateC. WATER MOLECULEFrom its Stark effect the line at 10, 919. 39 Mc/sec has been tentatively assigned tothe 220 - 313 transition of D 2 0 , a conclusion which is supported by Zeeman-effect meas-urements (see above).The Stark components of the lines at 10, 947. 13 Mc/sec and 26, 880. 38 Mc/sechave been resolved and the splittings measured. The lines appear to arise fromP- or R-branch transitions of HDO, but definite identification does not appear to befeasible on the basis of the Stark effect alone. Calculation of some of the molecularparameters of HDO, based on the observed microwave spectrum, is proceeding.D. W. Posener-20-(V. MICROWAVE SPECTROSCOPY)D. PARAMAGNETIC RESONANCE IN OXYGEN GASApparatus for the study of the Zeeman splittings of molecular oxygen levels is beingbuilt up. This spectrum has been studied in the X-band (R. Beringer, J. G. Castle, Jr.Phys. Rev. 81, 82, 1951), but only tentative identification of many lines was possiblebecause of the difficulty of the calculations. It is planned to study the spectrum in theS-band, where interpretation should be easier. An S-band klystron oscillator has beenstabilized to a silver-plated cavity resonant in the TM010 mode. The necessary vacuumsystem is being completed, and tests of the entire system should be possible in the nearfuture.M. Tinkham-21-

Microwave Spectroscopy

http://dspace.mit.edu/bitstream/1721.1/51059/1/RLE_QPR_027_V.pdf

Microwave Spectroscopy

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