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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...
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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.
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Spectroscopic characterisation of radical polyinterhalogen molecules.

Joe Gregory1, Jan R R Verlet2, James N Bull1

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|April 10, 2020
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Summary

Spectroscopic characterizations reveal details of radical polyinterhalogen molecules IF2 and I2F. These molecules and their anions are relevant to semiconductor manufacturing processes.

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Area of Science:

  • Chemical Physics
  • Spectroscopy
  • Materials Science

Background:

  • Polyinterhalogen species like IF2 and I2F are important in industrial applications.
  • Anions IF2- and I2F- are frequently produced in Ar-CF3I plasmas.
  • These anions have relevance in the semiconductor manufacturing industry.

Purpose of the Study:

  • To spectroscopically characterize the radical polyinterhalogen molecules IF2 and I2F.
  • To investigate the properties of the parent anions IF2- and I2F-.

Main Methods:

  • Anion photoelectron spectroscopy was employed for characterization.
  • Analysis focused on the electronic structure of the target molecules and anions.

Main Results:

  • Spectroscopic data provided insights into the electronic states of IF2 and I2F.
  • The study confirmed the [I-I-F]- isomer structure for the I2F- anion.
  • I2F- was identified as a "non-classical" polyinterhalogen species.

Conclusions:

  • The spectroscopic characterization provides fundamental data on IF2 and I2F radicals.
  • Understanding these species and their anions is crucial for optimizing plasma processes in semiconductor manufacturing.
  • The identification of I2F- as a non-classical polyinterhalogen expands knowledge of halogen chemistry.