Energies and lifetimes of the predissociative v=12 and 13 levels of the D 1Πu+ state in H2

Double resonance laser spectroscopy via the E, F(1)Sigma(+)(g), v' = 6, J' state was used to probe the v = 12 and 13 levels of the D (1)Pi(+)(u) state of H(2). Dissociation spectra were recorded by detecting atomic ion production as a function of energy using a time-of-flight mass spectrometer. Experimental linewidths corresponding to predissociative lifetimes on the order of similar to 100 ps for the J = 1-4, v = 12 and 13 levels of D (1)Pi(+)(u) state are reported for the first time. Transition energies were also measured and used to determine rotational constants for the v = 12 and 13 levels.