Absorption spectra of NH4MnCl3 and NH4MnF3 |
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| Affiliation: | 1. Departamento de Optica y Estructura de la Materia, C-IV Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, E-28049 MADRID, Spain.;7. Departamento de Electroquímica, C-II Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, E-28049 MADRID, Spain.;1. Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, CA 95616, United States;2. Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States;3. Mechanical, Aerospace & Biomedical Engineering Department, University of Tennessee Space Institute, Tullahoma, TN 37388, United States;1. Molecular Biology laboratory, Department of Molecular and Translational Medicine, University of Brescia, Viale Europa 11, 25123 Brescia, Italy;2. G. Ronzoni Institute for Chemical and Biochemical Research, Milano, Italy;3. Department of Medicine, University of Verona, Verona, Italy;4. Laboratorio Analisi Chimico-Cliniche, AO Spedali Civili of Brescia, Piazzale Spedali Civili 1, 25123 Brescia, Italy;1. Material Science and Engineering College, Northeast Forestry University, Harbin 150040, PR China;2. Dehua TB New Decoration Material Co., Ltd, Huzhou 313200, PR China;1. Department of Materials Science and Chemical Engineering, Hanyang University, Ansan, 15588, Republic of Korea;2. Department of Bionano Technology, Hanyang University, Ansan, 15588, Republic of Korea;3. Department of Applied Chemistry, Hanyang University, Ansan, 15588, Republic of Korea |
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| Abstract: | The absorption spectra of NH4MnCl3 and NH4MnF3 crystals have been measured down to 10 K in the 250 to 600 nm region. The observed bands are assigned to electronic transitions from the 6A1g(S) ground state to various excited levels of Mn2+ ions in an octahedral crystalline field. The position of the bands have been fitted within the strong crystal field scheme. Resulting parameters at room temperature are B=741, C=2990 and Dq=520 cm−1 for NH4MnCl3 and B=800, C=3139 and Dq=694 cm−1 for NH4MnF3. At low temperature some bands show a rich fine structure in which some phonon progressions have been identified. |
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