Photoelectron imaging spectroscopy of molecular and cluster anions: CS2− and OCS−(H2O)1,2

Abstract

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Low-energy photoelectron imaging spectroscopy of nitromethane anions: Electron affinity, vibrational features, anisotropies, and the dipole-bound state

“…For example, Surber and Sanov 48 noted the diminution of near-threshold transitions compared to FranckCondon intensities in the CS 2 − imaging photoelectron spectrum. This effect is also evident in the present experiments, as may be seen by comparing the relative intensities of the 0 ← 0 and 1 ← 0 NO 2 wagging transitions in the spectra in Fig.…”

A multi-agent quantum Monte Carlo model for charge transport: Application to organic field-effect transistors

“…At higher detachment photon energies, the anisotropy was also observed to decrease because of the increased kinetic energies of the outgoing electrons. 89 Even though photoelectron angular distributions are governed by partial wave interferences of the outgoing electron for neutral or singly charged anions, 86 classical electrostatic effects dominate in MCAs and seem to have smeared out any quantum effects. Using the three isomers of benzene dicarboxylate dianions [o-, m-, p-C 6 H 4 (CO 2 ) 2 2− ], we showed that the PE angular distributions were quite sensitive to the locations of the extra charges, 91 suggesting that PE imaging may allow structural information to be obtained for complex MCAs.…”

“…38,[81][82][83][84] The strong intramolecular Coulomb repulsion not only influences the energetics and stability of MCAs, but it is also expected to strongly influence the electron emission dynamics, which can be investigated using PE imaging by measuring the photoelectron angular distribution. [85][86][87] The first PE imaging on MCAs was done on a series of linear aliphatic dicar- [88][89][90] which were expected to display strong anisotropy in the PE angular distribution. Because photoemission took place from one end of the MCAs, the outgoing electron was expected to be pushed to peak along the axis of the molecules.…”

Femtosecond Time‐Resolved Photoelectron Spectroscopy

“…The most straightforward 2D imaging technique is photoelectron velocity-map imaging (VMI), 98 a variant of the elegant photofragment imaging method developed by Chandler and Houston. 99 Photoelectron VMI was first demonstrated by Eppink and Parker for neutrals 98,100 and by Bordas 101 and Sanov 102 for negative ions. Typically, a strong electric field projects nascent charged particles onto a microchannel plate (MCP) detector.…”

“…This experiment is the first application of rotational coherence spectroscopy to an anion. Furthermore, qualitative analysis of the anisotropy oscillation in reference to molecular alignment following a parallel transition in a simple diatomic, guided by ideas put forth by Sanov, 102 Reed, 269 and Reid and Underwood, 60 provides some insight into the molecular-frame detachment process, indicating a detachment wave with larger amplitude perpendicular rather than parallel to the molecular axis.…”