Rotational wave packet revivals on an excited electronic state have been measured by femtosecond time-resolved photoelectron imaging for the first time. The first full revival at 82 ps of S1 (n,pi*) pyrazine was clearly observed in the time dependencies of the photoelectron intensity and the photoelectron angular distribution (PAD). The PAD, measured for laser aligned pyrazine, clearly reflects the different characters of pi* and 3s molecular orbitals.
Two-color and one-color resonance enhanced multiphoton ionization photoelectron spectroscopies (REMPI–PES) have been applied to Rydberg states (n=3) of jet-cooled pyrazine. The 3s and 3p members of Rydberg series converging to the ground state (n−1) of the cation and the 3s member of a Rydberg series converging to an excited state of the cation (π−1) were observed. The photoelectron angular distributions (PADs) measured via the 3s(n−1) state drastically differed for the two-color and one-color REMPI experiments. This behavior is ascribed to different molecular axis alignments created by the two-photon excitation schemes. The PADs were also used to discriminate between the different Rydberg series.
The OH(v@ \ 4, N@ \ 1) products of the photon-initiated reaction O(1D 2 ) N@) ] H have been probed using Doppler-resolved ] H 2 (v \ 0) ] OH(v@, laser induced Ñuorescence. The data are used to extract the product stateresolved di †erential cross-section and excitation function. The state-speciÐc angular distribution displays pronounced forwardÈbackward peaks with a bias for backward scattering. The experimental data are compared with the results of QCT calculations, using two alternative ab initio versions of the ground 11A@ potential energy surface, and a recent ab initio version of the Ðrst excited 11AA potential energy surface, in order to assess its possible inÑuence on the overall dynamics of the reaction.
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