Abstract
THIS communication describes preliminary measurements of the oscillation frequency of the Signals Research and Development Establishment Maser No. 5 at the National Physical Laboratory, Teddington (by the Standards Division), and afterwards at the Research Laboratories of the Australian Post Office in Melbourne, Australia. Maser No. 5 is a rack-mounted experimental maser with continuous pumping and employs unpurified commercial anhydrous ammonia. An eight-pole state separator is used together with a silver-plated brass microwave cavity operating in the TM 010 mode. The cavity is thermally tuned to the (3,3) transition. A more detailed description of this maser may be found elsewhere1.
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References
Mitchell, A. M. J., Roots, K. G., and Phillips, G., “Electronic Technology”, (to be published).
Barnes, F. S., Proc. Inst. Rad. Eng., 47, 2085 (1959).
Essen, L., and Parry, J. V. L., Trans. Roy. Soc., 250, 45 (1957).
Observatoire de Neuchâtel, Suisse, Circulaire No. 2 (May 1959).
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MITCHELL, A., SANDBACH, E. Measurements of the Frequency of an Ammonia Maser in England and Australia. Nature 185, 833–834 (1960). https://doi.org/10.1038/185833a0
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DOI: https://doi.org/10.1038/185833a0
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