Threshold photoelectron spectrum for N2O in the excitation energy range of 19.9–20.7 eV with an increment of 0.005 eV. The vibrational progressions of the C2Σ+ state are assigned, according to Ref. 19.
Vibrational state-selected TPEPICO TOF mass spectra for the DPI process of N2O. (a) b(0,0,0) state at 20.045 eV; (b) C(0,0,0) state at 20.100 eV; (c) C(1,0,0) state at 20.260 eV; (d) C(0,0,1) state at 20.390 eV.
3D time-sliced coincidence images of NO+ and total kinetic energy released distributions at different vibronic levels of N2O+(C2Σ+) state. The electric vector E of synchrotron radiation is noted as the vertical direction of the image plane, where (a)–(c) are recorded at 20.100, 20.260, and 20.390 eV, respectively, and corresponding to the C(0,0,0), C(1,0,0), and C(0,0,1) vibronic levels. Least-squares fitting of the total KERD curves with two Gaussian profiles are plotted with the solid line.
Anisotropic parameters of dissociation from the vibrational state-selected N2O+(C2Σ+) ions, where the symbol lines with triangles and squares are corresponding to the NO+(X1Σ+) + N(2D) and NO+(X1Σ+) + N(2P) dissociation channels, respectively. The experimental and fitted angular distributions of NO+(X1Σ+,v + = 3) fragments dissociated through the NO+(X1Σ+) + N(2P) dissociation channel from N2O+(C2Σ+,0,0,0) ions are presented in the inserted figure, where the open circles represent experimental data and the solid line is the fitted result.
Schematic diagram of adiabatic correlation for the low-lying electronic states of N2O+. The curve with the arrow represents a predissociation mechanism of the C2Σ+ state to produce NO+(X1Σ+) and N(2P) fragments, while the cycle notes the crossing from the B2Π state to 2Σ− (or 2Δ) state, and the bottom curve with the arrow shows the indirect predissociation process via B2Π to form NO+(X1Σ+) and N(2D).
Potential dissociation limits of N2O+ ion in the excitation energy range of 19.9–20.7 eV.
Spectral assignments, ionization energies, and relative intensities of threshold photoelectron spectra of N2O in the excitation energy range of 19.9–20.7 eV.
Branching ratios of fragment ions dissociated from the N2O+(C2Σ+) ion.
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