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NO+ formation pathways in dissociation of N2O+ ions at the C2Σ+ state revealed from threshold photoelectron–photoion coincidence velocity imaging
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10.1063/1.3549130
/content/aip/journal/jcp/134/5/10.1063/1.3549130
http://aip.metastore.ingenta.com/content/aip/journal/jcp/134/5/10.1063/1.3549130

Figures

Image of FIG. 1.
FIG. 1.

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.

Image of FIG. 2.
FIG. 2.

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.

Image of FIG. 3.
FIG. 3.

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.

Image of FIG. 4.
FIG. 4.

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.

Image of FIG. 5.
FIG. 5.

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).

Tables

Generic image for table
Table I.

Potential dissociation limits of N2O+ ion in the excitation energy range of 19.9–20.7 eV.

Generic image for table
Table II.

Spectral assignments, ionization energies, and relative intensities of threshold photoelectron spectra of N2O in the excitation energy range of 19.9–20.7 eV.

Generic image for table
Table III.

Branching ratios of fragment ions dissociated from the N2O+(C2Σ+) ion.

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/content/aip/journal/jcp/134/5/10.1063/1.3549130
2011-02-04
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: NO+ formation pathways in dissociation of N2O+ ions at the C2Σ+ state revealed from threshold photoelectron–photoion coincidence velocity imaging
http://aip.metastore.ingenta.com/content/aip/journal/jcp/134/5/10.1063/1.3549130
10.1063/1.3549130
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