Related Experiment Video
Updated: Jun 28, 2026
06:53
Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−
Published on: July 27, 2018
Photoelectron angular distribution and molecular structure in multiply charged anions.
The Journal of Physical Chemistry. A
|November 15, 2008
Summary
Photoelectron imaging reveals how intramolecular Coulomb repulsion in multiply charged anions (MCAs) depends on molecular structure. The study shows distinct photoelectron angular distributions for benzene dicarboxylate dianion isomers, enabling structural determination.
Area of Science:
- * Physical Chemistry: Investigating electron dynamics and molecular structure interactions.
- * Spectroscopy: Utilizing photoelectron imaging for molecular analysis.
Background:
- * Multiply charged anions (MCAs) exhibit intramolecular Coulomb repulsion (ICR), influencing emitted photoelectron properties.
- * Photoelectron angular distributions (PAD) are sensitive to molecular structure and ICR effects.
Discussion:
- * The study analyzes three isomers of benzene dicarboxylate dianions (C6H4(CO2)2(2-): o-, m-, and p-BDC(2-)).
- * Observed photoelectron peaking along laser polarization is attributed to ICR.
- * The degree of anisotropy in PAD varies significantly among the isomers, with p-BDC(2-) showing the largest anisotropy.
Key Insights:
- * Photoelectron imaging successfully captures the influence of ICR on PAD for MCAs.
- * PAD anisotropy directly correlates with the molecular structure and ICR direction in benzene dicarboxylate dianions.
- * The observed differences in anisotropy among o-, m-, and p-BDC(2-) isomers highlight their distinct structural features.
Outlook:
- * Photoelectron imaging shows promise for determining the structures of complex MCAs.
- * Further research can refine the technique for detailed molecular structure elucidation in various MCAs.
More Related Videos
08:54Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
Published on: January 25, 2020
11:04Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides
Published on: September 7, 2019
Related Concept Videos
01:18π Molecular Orbitals of the Allyl Cation and Anion
An allyl group is a three-carbon conjugated system where the sp³-hybridized allylic carbon is bonded to a CH=CH2 group via a single bond. Allyl anions can be obtained by treating propene with a strong base that can deprotonate methyl groups. Allyl cations are formed as intermediates during substitution reactions involving allylic halides. In both cases, the hybridization of the allylic carbon changes from sp3 to sp2, giving rise to a carbon chain with three sp2-hybridized carbons, each with an...
01:18Aromatic Hydrocarbon Anions: Structural Overview
Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
Due to the absence of continuous overlap of p...
Due to the absence of continuous overlap of p...
01:18Molecular Shapes
Molecules have characteristic shapes that are crucial for their function. The arrangement of various electron groups around the central atom dictates their molecular geometry. Electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between the electron pairs by maximizing the distance between them. The valence electrons form either bonding pairs, located primarily between bonded atoms, or lone pairs.Two regions of electron density in a diatomic...
01:20Mass Spectrometry: Molecular Fragmentation Overview
The ionization of a molecule into a molecular ion inside the mass spectrometer causes instability in the molecule's structure due to the loss of an electron. This eventually leads to the fragmentation or breaking of some bonds in the molecule. The fragmentation occurs predominantly at specific bonds to yield relatively stable fragments.
One type of fragmentation pattern is the cleavage of a single bond in the molecular ion. The cleavage leads to a radical and a cation. The cleavage can occur at...
One type of fragmentation pattern is the cleavage of a single bond in the molecular ion. The cleavage leads to a radical and a cation. The cleavage can occur at...
01:27π Electron Effects on Chemical Shift: Overview
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0, resulting in...
02:28Electronic Structure of Atoms
An atom comprises protons and neutrons, which are contained inside the dense, central core called the nucleus, with electrons present around the nucleus. Taking into account the wave–particle duality of electrons and the uncertainty in position around the nucleus, quantum mechanics provides a more accurate model for the atomic structure. It describes atomic orbitals as the regions around the nucleus where electrons of discrete energy exist, characterized by four quantum numbers: n, l, ml, and...