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Lifetime measurements of the radiative 3p pi D1 Pi u- levels of H2.

Lifetimes of 3p..pi.. D/sup 1/Pi/sub u//sup -/ vibrational levels of molecular hydrogen, v' = 3--15, excited by vuv synchrotron radiation, were measured by time-resolved spectroscopy. The observed lifetimes range from 2.3 to 3.0 ns and are almost constant (about 2.6 ns) and independent of vibrational quantum number within experimental error. This value agrees with calculated radiative lifetimes. The emission corresponding to the D-E transition is observed in the 6000--7500-A spectral range, and a cascade in the 3000--6000-A range is identified to I and G to B transitions. The D-F transition could not be detected.