Vacuum ultraviolet pulsed field ionization-photoelectron study for N2O+ in the energy range of 16.3-21.0 eV

The vacuum ultraviolet pulsed field ionization−photoelectron (PFI−PE) spectra for N2O have been measured in the energy range of 16.3−21.0 eV, covering the vibronic bands of N2O+(A2Σ+, B2Π, and C2Σ+). Many vibronic bands, which were not resolved in previous photoelectron studies, are identified in the present measurement. As observed in the HeI photoelectron spectra of N2O, the PFI−PE spectra for N2O+(A2Σ+ and C2Σ+) are dominated by excitation of the ν1+ (symmetric stretching) and ν3+ (antisymmetric stretching) modes, along with weak bands due to excitation of both even and odd quanta of the ν2+ (bending) mode. The simulation of the rotational contours resolved in the PFI−PE bands associated with excitation to N2O+(A2Σ+, ν1+ = 0−1, ν2+ = 0, and ν3+ = 0−1) has revealed the orbital angular momentum of the outgoing photoelectrons and yielded accurate ionization energies for the formation of these states from N2O(X1Σ+).