Direct Electron-to-Carbon Polarization Transfer in Homogeneously Doped Polycarbonates

Abstract

A direct electron to carbon DNP solid effect polarization transfer is observed for the aromatic and carbonyl carbons of polycarbonate homogeneously doped with BDPA. The direct electron to carbon polarization transfer operates over a range of 30 to 60 A. Carbons that are closest to the frees radicals are polarized first and have the longest spin-lattice relaxation times. Fourier transforms of time domain magnetization, synchronously detected under combined chemical shift and C-H dipolar interactions, show an asymmetrical sideband pattern in the dipolar frequency dimension. Simulations that qualitatively agree with the observed asymmetrical sideband patterns are obtained by assuming that molecular motion in the vicinity of the bulky free radical is reduced.

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Document Details

Document Type
Technical Report
Publication Date
Nov 14, 1991
Accession Number
ADA242572

Entities

People

  • Jacob Schaefer
  • Mobae Afeworki
  • Shimon Vega

Organizations

  • University of Washington

Tags

Communities of Interest

  • Air Platforms
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Acquisition
  • Asymmetry
  • Chemical Shifts
  • Chemistry
  • Classification
  • Computer Programs
  • Data Acquisition
  • Engineering
  • Free Radicals
  • Frequency
  • Integrals
  • Military Research
  • Molecular Dynamics
  • Quantum Properties
  • Resonance
  • Simulations
  • Time Domain

Readers

  • Organic Chemistry
  • Quantum spin resonance or Electron Paramagnetic Resonance spectroscopy.

Technology Areas

  • Microelectronics