کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1816114 1525263 2007 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
EPR and optical study of Mn2+ doped L-asparagine monohydrate
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
EPR and optical study of Mn2+ doped L-asparagine monohydrate
چکیده انگلیسی

The EPR spectrum of Mn2+ doped L-asparagine monohydrate at 77 K is analyzed and Mn2+ site entered in the lattice is discussed. The values of the zero field parameters providing good fit to the observed EPR spectra are determined. The evaluated g  , AA, BB, D, E and a values are 2.0912±0.0002, 98±2×10−4 cm−1, 91±2×10−4 cm−1, 299±2×10−4 cm−1, 99±2×10−4 cm−1 and −28×10−4 cm−1, respectively. The percentage covalency of the metal–ligand bond is also estimated. From the optical absorption at room temperature, the distortion in the lattice is suggested. The observed bands are assigned as transitions from the 6A1g(S) ground state to various excited quartet states of Mn2+ ion in a cubic crystalline field. The electron repulsion parameters (B and C), crystal field parameter (Dq) and Tree's correction (α) giving good fit to the observed optical spectra are evaluated and the values obtained for the parameters are B=767 cm−1, C=3032 cm−1, Dq=750 cm−1 and α=76 cm−1.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica B: Condensed Matter - Volume 387, Issues 1–2, 1 January 2007, Pages 222–226
نویسندگان
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