We report the implementation of covariance mapping mass spectmscopy to pulsedelectrowbeam ionization time-of-flight mass spectroscopy. The technique has been applied .~..

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Collisional deexcitation of metastable ions: A new technique to separate radiative and nonradiative contributions AIP Conf.Radiative lifetimes and bimolecular rates have been determined for two-photon laser excited states ofXe* (5p 5 6p, 5p 5 6p', 5p 5 7p) in argon and xenon buffer gases. The collisional deactivation rates are found to be very large for the Xe 6p' and 7p states [-(2-5) X lO-1O cm3/s] while the rates for the Xe 6p states are comparatively smaller [-(0.06-1.2) X lO-1O cm 3 /s]. In general, the quenching rates in argon are about a factor of 2 smaller than the xenon quenching rates for the same excited state with the notable exception ofXe 6p[ 112]0' For Xe 6p [ 112] 0' a multicomponent decay has been observed in argon buffer gases. The second component is attributed to collisional coupling to Xe 5d[ 112] 1 which lies 132.3 cm -I below Xe 6p [ 112] 0' Quench rates determined from the collisionally induced VUV fluorescence from Xe 5d[ 112] 1 at 125 nm are in excellent agreement with this assignment. Furthermore, these experiments have unambiguously identified the product channel involved in the curve crossings observed in studies of optical collisions [N.

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