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Time-slice velocity-map ion imaging studies of the photodissociation of NO in the vacuum ultraviolet region
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Image of FIG. 1.
FIG. 1.

The VUV spectrum of O+ produced by exciting the autoionization lines of O(1D) produced from the photodissociation of NO. The VUV wavelength was scanned from 106 900 cm−1 to 108 480 cm−1. The relative intensity is not normalized to the VUV intensity and the two parts of the spectrum were scanned separately (this range cannot be covered with only one visible laser dye). The VUV photon energy is calculated by 2ω1 + ω2. The assignments for each of the three strong peaks are showed in the figure.

Image of FIG. 2.
FIG. 2.

Time-slice image, total kinetic energy release spectrum, and the angular distribution for photodissociation channel N(2Do) + O(1Do) produced after single VUV photon excitation of NO and detection of the O(1Do) atom at the same wavelength through an autoionization line. (a) Time-slice image at VUV photon energy of 108 459.0 cm−1 (13.4472 eV), (b) P(ETKER) spectra at VUV photon energies of 108 459.0 cm−1 (13.4472 eV) (solid curve) and 106 929.8 cm−1 (13.2576 eV) (dotted curve), and (c) angular distribution of the channel N(2Do) + O(1Do) produced after VUV photon excitation at 108 459.0 cm−1 (13.4472 eV), a recoil anisotropy parameter of −0.94 gave the best fit (solid line) to the experimental measurement (solid dots) of the angular distribution of the peak corresponding to the channel N(2Do) + O(1Do).

Image of FIG. 3.
FIG. 3.

VUV photoionization spectra of N atom produced from VUV photodissociation of NO from 110 280 cm−1 to 110 310 cm−1. The relative intensity is not normalized. The peak at 110 290.8 cm−1 (13.6743 eV) is caused by the strong resonant line of Kr: 4s 24p 5(23/2)8d 2[1/2]11S0. The Kr gas leaked into the interaction region from the VUV four-wave mixing chamber.

Image of FIG. 4.
FIG. 4.

Time-slice velocity-map ion images of NO by probing N(2Do) and their corresponding total kinetic energy release (TKER) spectra. (a) and (b) 110 305.0 cm−1 (13.6761 eV); (c) and (d) 110 296.5 cm−1 (13.6751 eV); (e) and (f) 110 286.7 cm−1 (13.6738 eV). The VUV was scanned to cover the whole Doppler profile.

Image of FIG. 5.
FIG. 5.

Total kinetic energy release, TKER, spectra are measured by probing O(3Po) using a 1 + 1 ionization scheme. Solid line: 2s 22p 3(4S°)7d 3D° ← 3P2 at 107 583.9 cm−1 (13.3387 eV); solid dots: 2s 22p 3(4S°)7d 3D° ← 3P1 at 107 425.0 cm−1 (13.3190 eV); and open circles: 2s 22p 3(4S°)6d 3D° ← 3P2 at 106 766.0 cm−1 (13.2373 eV). The two dissociation channels N(2Do)+O(3Po) and N(2Po)+O(3Po) at total kinetic energy release of 4.50 eV and 3.30 eV, respectively, are showed in the figure.

Image of FIG. 6.
FIG. 6.

Energy diagram for all the dissociation channels of NO below 15 eV.


Generic image for table
Table I.

Recoil anisotropy parameters for the dissociation channel N(2Do) + O(1Do).

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Table II.

Autoionization lines of N(2Do).

Generic image for table
Table III.

Recoil anisotropy parameters and branching ratios for the dissociation channels by probing N(2Do).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Time-slice velocity-map ion imaging studies of the photodissociation of NO in the vacuum ultraviolet region