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Photoelectron images of Au2 − taken at a photodetachment wavelength of 590.41 nm (2.1000 eV). (a) The raw image. (b) The 3D view of the raw image after inverse-Abel transformation. (c) The 2D view of the inverted image overlaid with the electron kinetic energy distribution obtained by integrating the electron counts circumferentially.
Photoelectron spectrum of Au2 − taken at 442.80 nm (2.8000 eV). The points represent the experimental data and the solid line is the Franck-Condon simulated spectrum. The vertical sticks represent the calculated Franck-Condon factors: black for v ← 0′, blue for v ← 1′, red for v ← 2′, and green for v ← 3′ transitions.
Photoelectron spectrum of Au2 − taken at 590.41 nm (2.1000 eV) together with the detailed vibrational assignments. The dashed lines indicate transitions with low or negligible Franck-Condon factors (see Fig. 2 ).
Photoelectron images and spectra of Au2 − at different detachment photon energies: (a) 671.28 (1.8470 eV), (b) 652.55 (1.9000 eV), (c) 635.82 nm (1.9500 eV), (d) 619.92 (2.0000 eV), and (e) 604.80 nm (2.050 eV). The left panel shows the photoelectron images after the inverse-Abel transformation. The double arrow in (a) indicates the polarization of the laser. The kinetic energy and the corresponding peak width (FWHM) for some of the peaks are also shown.
The obtained spectroscopic constants for Au2 and Au2 −, in comparison with those from the literature.
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