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Frequency Standards and Metrology - Proceedings of the Fourth Symposium, Ancona, Italy, September 5 - 9, 1988 (Paperback, Softcover reprint of the original 1st ed. 1989)
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Frequency Standards and Metrology - Proceedings of the Fourth Symposium, Ancona, Italy, September 5 - 9, 1988 (Paperback, Softcover reprint of the original 1st ed. 1989)
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Since the previous Symposium, several exciting new developments and
advances have occurred in the field of frequency standards and
metrology. These include the first results on the long-tenn
stability of a millisecond Pulsar, for which data 14 integrated
over several years now show a stability of around 10- .
Improvements in the understanding of various biases in Cesium beam
standards promise accuracies in the low 14s for primary standards
and in the low 13s for short commercial tubes, for which long tenn
stabilities in low 14s have already been shown to be obtainable by
accuracy improvement. Beams using optical pumping for state
selection and for detection have been operated with excellent
results, and more are being realized. Other new frequency standards
which have appeared include a macroscopic rf trap with Mercury
ions, which perfonns in the low 15s in one day, the sub millimeter
metastable Magnesium beam, which has shown a short tenn stability
19 in the low 12s in one second and promises an accuracy of 10- ,
and the cold Hydrogen masers, which have such high stabilities that
they cannot be measured with existing local oscillators. Prospects
for future developments include laser manipulation of neutrals and
spectroscopy of single ions at rest in a trap. Both these groups of
techniques have great potential for unprecedented accuracy and
short-and long-tenn stability, and new superior frequency standards
are expected to be realizable in this way in the not too distant
future.
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