Density-Dependent, Shifts of Hydrogen Maser Standards

Crampton, S. B.; Wang, H.T.M.

doi:10.1109/freq.1974.200042

Cited by 11 publications

(3 citation statements)

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“…The mean collision rate n, was then 10 times smaller than in masers of regular design [2]. But the effect of magnetic field inhomogeneities [8,9] may be a serious problem in such a large volume.…”

Section: Possible Solutions Of the Wall Shift Problemmentioning

confidence: 99%

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Temperature Dependence of the Hydrogen Maser Wall Shift in the Temperature Range 295-395 K

1980

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Possible ways to improve the hydrogen maser accuracy are stated. Use of a special bulb, made of quartz, allowing simulation of two different mean diameters is proposed. It is experimentally proved that it allows one to achieve very good operating conditions in the temperature range 300-395 K. Measurement, with this bulb, of the temperature dependence of a FEP 120 teflon coating is reported. A change of FEP 120 properties is observed at a temperature of 360 K. This is confirmed by operating a hydrogen maser with a classical spherical bulb. A null of the mean phase shift per collisions occurs at a temperature of 385 K. Good precision of wall shift measurements made with the special bulb, in the temperature range 300-360 K allowed one to achieve an accuracy of 6-x and to determine the unperturbed hydrogen hyperfine transition frequency f~ with a precision of 7 x The result is f H = 1420405 751.773 f 0.001 Hz.

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Section: Possible Solutions Of the Wall Shift Problemmentioning

confidence: 99%

“…The bulb shown in Figure le has the advantage of better centering in the microwave and the static magnetic fields. This is of importance in order to minimize the frequency shift which might be connected with inhomogeneities of these fields [8,9].…”

Section: Possible Solutions Of the Wall Shift Problemmentioning

confidence: 99%

Temperature Dependence of the Hydrogen Maser Wall Shift in the Temperature Range 295-395 K

1980

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“…In practice, the scatter obtained from the non-reproducibility of the surface was much greater than the tuning accuracy. In the results shown in Figure 2, no correction was made for shifts due either to magnetic field inhomogeneities (Em) [22] or residual spin exchange shifts (EH) [23]. These are small effects and are masked by the scatter observed in the experimental results.…”

Section: Experimental Results On the Wall Shiftmentioning

confidence: 99%

A Comparison of the Wall Shift of TFE and FEP Teflon Coatings in the Hydrogen Maser

Vanier¹,

Larouche²

1978

Metrologia

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The results obtained up to now by various authors relative to the H maser wall shift of FEP 120 and TFE 42 teflons are summarized. New measurements of the wall shift for these two types of teflon are described and new results are given. A measurement of the hyperfine frequency of the ground state of hydrogen is reported; it verifies the validity of the results obtained on the measurements of the wall shift.

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