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%'e report here a measurement of the lifetime of the first vibration state of LiF. The experiment w'as carried out using an electric-resonance molecular-beam technique and yielded the result~&0--14.3'2 & msec. This value is smaller than the prediction of Rittner's model and also smaller than estimates using existing spectroscopic data.

A simple method allows unlimited replacement of filaments in glass Bayard–Alpert vacuum gauges.

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We have measured the spontaneous vibrational decay rates in the KF electronic ground state for v=2 → 1 and v=1 → 0 transitions in both the J=1 and the J=2 rotational states using a velocity selected molecular-beam technique. The four decay rates are self-consistent and reduce to a 1 → 0 decay rate of 2.6±0.4 s−1, which agrees with rates inferred from spectroscopic data.