New results on photoion pair formation from application of the velocity imaging photoionisation coincidence technique

Abstract

The velocity imaging photoionisation coincidence (VIPCO) technique is shown to be a powerful tool for studies of ion pair formation. Sequential mechanisms are demonstrated for some three‐body ion pair formation reactions. Observation of a new type of reaction producing one negatively and two positively charged ions plus an electron is reported. Copyright © 2000 John Wiley & Sons, Ltd.

Superexcited State Dynamics Probed with an Extreme-Ultraviolet Free Electron Laser

“…Ion pair states [3] represent one class of high-lying neutral states that have been used to probe superexcited state photoexcitation processes, notably in the work of Mitsuke and co-workers [4 -8] and Eland et al [9]. Hepburn and co-workers have recently used threshold excitation of these states, followed by dissociation in a weak Stark field, to obtain very high resolution measurements of the energies of these dissociation asymptotes [10 -12].…”

“…Hepburn and co-workers have recently used threshold excitation of these states, followed by dissociation in a weak Stark field, to obtain very high resolution measurements of the energies of these dissociation asymptotes [10 -12]. Hikosaka and Eland have studied ion pair formation in methyl fluoride at 21 eV using coincidence detection [9]. They found evidence to support formation of electronically excited methyl cations as suggested by Mitsuke et al [8].…”

Photoion-pair dissociation dynamics of polyatomic molecules with synchrotron radiation

“…15 A more sophisticated imaging method, the positive-negative ion coincidence IVM technique, has also been developed for the ion-pair photodissociation studies. 31 However, the image quality of those coincidence experiments is not high, perhaps due to the low flux of the monochromatized light from a discharge lamp. 31 It is noted that a magnetic field was also utilized to eliminate the interferences of accidental coincidences between the scattered cation and the photoelectron.…”

Many-Particle Quantum Dynamics in Atomic and Molecular Fragmentation

“…If the number of fragments N > 4, there is no unique solution of the system (l. 101). The mi-values, in turn, can be obtained from the momentum and mass conservation laws, which can be written as a system of The system of equations (l.101) together with (l.98)-(l.100) allows one to determine the masses mi of up to N = 4 fragments.…”

“…2.1). Related problems are investigated in the study of photo ion-pair formation [101]. 14 for DMPI ofH2 , and to Chap.…”