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Related Concept Videos

Radicals: Electronic Structure and Geometry01:07

Radicals: Electronic Structure and Geometry

This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
Accordingly, the structure of a trivalent radical lies between the geometries of carbocations and carbanions. An sp2-hybridized carbocation is trigonal planar, while an sp3-hybridized carbanion is trigonal pyramidal. Here, the difference in geometry is...
Radical Reactivity: Overview01:11

Radical Reactivity: Overview

Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired molecule. These three...
π Molecular Orbitals of the Allyl Radical01:27

π Molecular Orbitals of the Allyl Radical

Allyl radicals are three-carbon conjugated systems. They are readily formed as intermediates in halogenation reactions of alkenes involving the addition of halogen to the allylic carbon instead of the double bond. As seen in allyl cations and anions, each of the three sp2-hybridized carbon atoms in allyl radicals has an unhybridized p orbital. These orbitals combine to give three π molecular orbitals.
The allyl systems have identical molecular orbitals but differ in the number of π electrons.
Radical Reactivity: Steric Effects01:10

Radical Reactivity: Steric Effects

The presence of electron-donating, electron-withdrawing, or conjugating groups adjacent to a radical center, imparts electronic stabilization to the radicals. Examples of such electronically-stabilized radicals are triphenylmethyl, tetramethylpiperidine‐N‐oxide, and 2,2‐diphenyl‐1‐picrylhydrazyl. These radicals are remarkably stable and are known as persistent radicals. Some of the persistent radicals can even be isolated and purified.
Along with electronic factors, steric factors also account...
Radical Formation: Abstraction00:47

Radical Formation: Abstraction

The electron of an atom can be abstracted from a compound by a relatively unstable radical to generate a new radical of relatively greater stability. For example, an initiator which forms radicals by homolysis can abstract a suitable species like a hydrogen atom or a halogen atom from a compound to generate a new radical. This ability of radicals to propagate by abstraction is a crucial feature of radical chain reactions.
Even though homolysis produces radicals, it is different from radical...
Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

Woodward–Hoffmann Selection Rules and Microscopic Reversibility

Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...

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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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A compact hexapole state-selector for NO radicals.

Moritz Kirste1, Henrik Haak, Gerard Meijer

  • 1Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany.

The Review of Scientific Instruments
|August 2, 2013
PubMed
Summary

This study introduces a novel electrostatic hexapole for focusing molecular beams, significantly reducing device length. It successfully focuses nitric oxide (NO) radicals with high density and purity using a compact 30 cm device.

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Area of Science:

  • Molecular Beam Focusing
  • Electrostatic Hexapole Technology
  • State-Selected Molecules

Background:

  • Focusing molecular beams with electrostatic hexapoles is crucial for state-selected molecule production.
  • Efficient focusing depends on molecular properties, hexapole length, and electric field strength.
  • Species with small dipole moments, like nitric oxide (NO), require long hexapoles (meters).

Purpose of the Study:

  • To develop a novel electrostatic hexapole state-selector design.
  • To achieve high electric field strengths for reduced device length.
  • To demonstrate efficient focusing of nitric oxide (NO) molecular beams.

Main Methods:

  • Designed and implemented a novel electrostatic hexapole with a maximum electric field strength of 260 kV/cm.
  • Integrated a beamstop at the hexapole's center to block carrier gas.
  • Utilized state-selective laser-induced fluorescence and 2D imaging for performance analysis.

Main Results:

  • Successfully focused a molecular beam of NO radicals using a compact 30 cm hexapole.
  • Achieved a high NO radical density of 9 ± 3 × 10^10 cm⁻³.
  • Demonstrated a state purity of 99% for the focused NO radicals.

Conclusions:

  • The novel hexapole design significantly shortens the required device length for focusing molecular beams.
  • This technology enables efficient production of state-selected NO radicals with high purity.
  • The integrated beamstop minimizes carrier gas interference with minimal loss of target molecules.