کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9587338 1393235 2005 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Orientational anisotropic studies by field rotation technique: Near zero-field pulsed EPR experiments of pentacene doped in p-terphenyl
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Orientational anisotropic studies by field rotation technique: Near zero-field pulsed EPR experiments of pentacene doped in p-terphenyl
چکیده انگلیسی
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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetic Resonance - Volume 176, Issue 2, October 2005, Pages 249-256
نویسندگان
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