Affordable Access

Orientational anisotropic studies by field rotation technique: near zero-field pulsed EPR experiments of pentacene doped in p-terphenyl.

Authors
  • Lang, Jun
  • Sloop, David J
  • Lin, Tien-Sung
Type
Published Article
Journal
Journal of magnetic resonance (San Diego, Calif. : 1997)
Publication Date
Oct 01, 2005
Volume
176
Issue
2
Pages
249–256
Identifiers
PMID: 16061413
Source
Medline
License
Unknown

Abstract

We report a new technique to map the orientational anisotropy of paramagnetic systems without physically changing the crystal orientations in near zero-field (NZF) pulsed EPR experiments. By implementing three sets of orthogonal coils around the sample, we are ble to create a magnetic vector up to 2 mT in any three-dimensional orientation in space. In NZF region, the hyperfine tensor elements are comparable to the electronic Zeeman interaction energy, thus very rich spectral patterns can be obtained by "dialing" in a magnetic field vector without moving the sample. The technique further allows us to examine the site symmetry of organic crystals and powdered solids doped with chromophores which can be photo-excited to the triplet state by laser light. The technique is exemplified in the study of pentacene in p-terphenyl crystals.

Report this publication

Statistics

Seen <100 times