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Vibrationally resolved photoemissions of N2 (C3Πu → B3Πg) and CO (b3Σ+ → a3Π) by low-energy electron impacts.

Vibrationally resolved photoemission spectra of the electronic-state transitions C3Πu → B3Πg of N2 and b3Σ+ → a3Π of CO following low-energy electron impacts are measured with a crossed-beam experimental arrangement. The absolute cross sections of C3Πu (ν') → B3Πg (ν″) of N2 are presented for the vibrational state-to-state transitions (ν',ν″) = (0,0), (0,1), (1,0), (1,2), and (2,1). The excitation cross sections of the metastable state C3Πu of N2 show the maxima at the electron-impact energies 14.10 (ν' = 0) eV and 14.50 (ν' = 1) eV, which are potentially related to the core-excited vibrational Feshbach resonant state 2Σu + of N2 - formed by electron attachment. The absolute cross sections of b3Σ+ (ν' = 0) → a3Π (ν″ = 0, 1, 2, 3, 4) of CO are given by the calibrations with those of N2 measured in this work. Besides the maximum excitation cross section 5.85 × 10-18 cm2 at 10.74 eV of the CO b3Σ+ (ν' = 0) state, some fine structures on the excitation function profile are attributed to different shapes and Feshbach resonant states of CO- formed by electron attachment, while the others arise from the direct electron-impact excitation. Some discrepancies, particularly for N2, between the present data and the results available in the literature studies arise from different experimental techniques and data-processing procedures. Furthermore, contributions of physical processes such as wave-packet evolution and non-Franck-Condon dynamics are highlighted here.