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Dissociative electron attachment cross sections for H2 and D2.

E Krishnakumar1, S Denifl, I Cadež

  • 1Tata Institute of Fundamental Research, Mumbai, India. ekkumar@tifr.res.in

Physical Review Letters
|July 21, 2011
PubMed
Summary
This summary is machine-generated.

New measurements of dissociative electron attachment (DEA) in hydrogen and deuterium resolve previous ambiguities. The study reveals a larger isotope effect, particularly in polar dissociation, offering a new test for theoretical models.

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Area of Science:

  • Atomic and Molecular Physics
  • Quantum Chemistry
  • Chemical Physics

Background:

  • Dissociative electron attachment (DEA) is a fundamental process in molecular physics.
  • Previous studies on DEA in H2 and D2 had ambiguities and lacked comprehensive theoretical validation.
  • Understanding isotope effects in DEA is crucial for refining theoretical models.

Purpose of the Study:

  • To present new, high-precision measurements of absolute cross sections for DEA in molecular hydrogen and deuterium.
  • To resolve previous experimental ambiguities in DEA measurements.
  • To investigate and quantify the isotope effect in DEA, including its manifestation in polar dissociation.

Main Methods:

  • Utilized a momentum imaging time-of-flight spectrometer for precise ion detection.
  • Eliminated contributions from electronically excited metastable neutrals and ultraviolet light.
  • Ensured complete detection of all resulting ions for accurate cross-section determination.

Main Results:

  • New absolute cross-section measurements for DEA in H2 and D2 were obtained.
  • A significantly larger isotope effect was observed compared to previous studies.
  • The isotope effect was found to be prominent in the polar dissociation channel (ion pair production).

Conclusions:

  • The new measurements provide a reliable dataset for testing theoretical models of DEA.
  • The observed large isotope effect, especially in polar dissociation, highlights the importance of nuclear dynamics in the DEA process.
  • This work offers a refined understanding of electron-molecule interactions and isotopic influences.