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Neutral molecules, isolated in the gas-phase, can be prepared in a long-livedexcited state and stored in a trap. The long observation time afforded by thetrap can then be exploited to measure the radiative lifetime of this state bymonitoring the temporal decay of the population in the trap. This method isdemonstrated here and used to benchmark the Einstein $A$-coefficients in theMeinel system of OH. A pulsed beam of vibrationally excited OH radicals isStark decelerated and loaded into an electrostatic quadrupole trap. Theradiative lifetime of the upper $\Lambda$-doublet component of the $X^2\Pi_{3/2}, v=1, J=3/2$ level is determined as $59.0 \pm 2.0$ ms, in goodagreement with the calculated value of $57.7 \pm 1.0$ ms.Comment: 4 pages, 3 figures, submitted to Phys. Rev. Let

Direct Measurement of the Radiative Lifetime of Vibrationally Excited OH Radicals