High-Rydberg fragment formation via core dissociation of superexcited Rydberg molecules

Abstract

Dissociative excitation of CO by electron impact: Translational spectroscopy of longlived highRydberg fragment atoms J. Chem. Phys. 60, 1358 (1974); 10.1063/1.1681205 Dissociative excitation of N2 by electron impact: Translational spectroscopy of longlived highRydberg fragment atoms Formation of high-Rydberg iodine atoms via core dissociation of ArF-excimer-laser excited methyl iodide high-Rydberg molecules is observed using a time-resolved, mass-analyzed, pulsed field ionization technique. This observation confirms that the Rydberg electron is essentially a spectator in the core dissociation process.

Neutral photodissociation of superexcited states of molecular iodine

“…In contrast, only very few studies have directly detected the high-n Rydberg fragments excited molecules using detectors based on field ionization. [6][7][8][9] In this study we report resonant excitation of I 2 by two photons from an ArF laser ͑193 nm͒ into molecular Rydberg states converging on the I 2 + ͑B 2 ⌺ g + ͒ ionic state ͑see Fig. 1͒.…”

“…It has been generally accepted that the SESs leading to the products in reaction ͑1c͒ are high-n molecular Rydberg states converging on each ion state, although non-Rydberg SESs have also been observed. 3 High-n Rydberg fragments from neutral dissociation of SESs have been directly observed in a small number of experiments; [4][5][6][7][8][9] however, the translational energy and angular distributions of these fragments were not measured. Extracting these data yields information on the dissociative ionic potential energy curves ͑PECs͒ as the PECs of the high-n Rydberg molecules are parallel to the ionic PECs to which they converge.…”

“…21͒ to discriminate between ions and Rydbergs, Pinnaduwage and Zhu have reported Rydberg formation in several systems following multiphoton excitation. 6,7 Clearly, the detection techniques based on fluorescence or photoelectron spectroscopy provide information only on those fragments which have a significant fluorescence yield or a high autoionization probability and as a consequence are principally sensitive to low-n Rydberg fragments. In contrast, only very few studies have directly detected the high-n Rydberg fragments excited molecules using detectors based on field ionization.…”

10.1007/s10733-008-2016-6

“…The efficiency of resonant two-photon dissociative ionization of the molecule seems to be higher than that of the nonresonant ionization of iodine atoms [16]; therefore, the molecular desorption pathway is preferred over the ionization pathway of the atomic photofragment. Photoionization in the gas is produced by photons carried in the same laser pulse.…”

Novel Analytical Techniques Based on a Enhanced Electron Attachment Process - Final Report - 09/15/1996 - 06/15/2001

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