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• W2032564181 abstract "Velocity map imaging of the photofragments arising from two-photon photoexcitation of molecular iodine in the energy range 73 500–74 500 cm−1 covering the bands of high-lying gerade Rydberg states [2Π1/2]c6d;0g+ and [2Π1/2]c6d;2g has been applied. The ion signal was dominated by the atomic fragment ion I+. Up to 5 dissociation channels yielding I+ ions with different kinetic energies were observed when the I2 molecule was excited within discrete peaks of Rydberg states and their satellites in this region. One of these channels gives rise to images of I+ and I− ions with equal kinetic energy indicating predissociation of I2 via ion-pair states. The contribution of this channel was up to about 50% of the total I+ signal. The four other channels correspond to predissociation via lower lying Rydberg states giving rise to excited iodine atoms providing I+ ions by subsequent one-photon ionization by the same laser pulse. The ratio of these channels varied from peak to peak in the spectrum but their total ionic signal was always much higher than the signal of (2 + 1) resonance enhanced multi-photon ionization of I2, which was previously considered to be the origin of ionic signal in this spectral range. The first-tier E0g+ and D′2g ion-pair states are concluded to be responsible for predissociation of Rydberg states [2Π1/2]c6d;0g+ and [2Π1/2]c6d;2g, respectively. Further predissociation of these ion-pair states via lower lying Rydberg states gives rise to excited I(5s25p46s1) atoms responsible for major part of ion signal. The isotropic angular distribution of the photofragment recoil directions observed for all channels indicates that the studied Rydberg states are long-lived compared with the rotational period of the I2 molecule." @default.
• W2032564181 created "2016-06-24" @default.
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• W2032564181 date "2014-03-27" @default.
• W2032564181 modified "2023-09-23" @default.
• W2032564181 title "Predissociation of high-lying Rydberg states of molecular iodine via ion-pair states" @default.
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• W2032564181 doi "https://doi.org/10.1063/1.4869205" @default.
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