Abstract
Experiments are reported on the effect of buffer gases on the hyperfine frequency of rubidium 87 as used in passive rubidium frequency standards. In some mixtures of buffer gases a strong quadratic dependence of the frequency on temperature is observed. The data are explained by means of a phenomenological approach and with the help of data published previously on pure buffer gases. A comment is made on an article which appears to lead to doubtful conclusions.
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