Abstract
Photoelectron studies of three photon resonant, four photon ionization of N2 via the b 1Πu, v′=0–5, c 1Πu, v′=0, 1, and c′ 1Σ+u, v′=0, 1 levels are presented. A qualitative analysis of the observed photoelectron spectra in terms of homogeneous perturbations among the b 1Πu, c 1Πu, o 1Πu states and among the b′ 1Σ+u, c′ 1Σ+u, and e′ 1Σ+u states is partially successful. However, several of the photoelectron spectra exhibit marked deviations from the expected behavior. These deviations are discussed in terms of more complex interactions among the intermediate levels, and in terms of the dynamics of excited state photoionization. In addition, the N2 a 1Πg, v′=0–5 levels have been observed in two photon resonant, four photon ionization, and the results are compared with the results of earlier two-photon laser induced fluorescence studies.
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