锰离子掺杂的磷酸二氢钠二水合物的电子自旋共振和光学研究
ESR and optical study of Mn2+-doped sodium hydrogen orthophosphate dihydrate.
作者信息
Kripal Ram, Singh D K
机构信息
Department of Physics, University of Allahabad, Allahabad, India.
出版信息
Spectrochim Acta A Mol Biomol Spectrosc. 2008 Mar;69(3):889-95. doi: 10.1016/j.saa.2007.05.039. Epub 2007 May 23.
ESR study of Mn(2+)-doped sodium hydrogen orthophosphate dihydrate (SHOD) single crystals is done at room temperature. The Mn(2+) spin-Hamiltonian parameters have been evaluated employing a large number of resonant line positions observed for different orientations of the external magnetic field. The values of g, A, B, D, E and a are: 2.0042+/-0.0002, 86+/-2 x 10(-4)cm(-1), 83+/-2 x 10(-4)cm(-1), 238+/-2 x 10(-4)cm(-1), 76+/-2 x 10(-4)cm(-1), 13+/-1 x 10(-4)cm(-1) for site I and 2.0032+/-0.0002, 86+/-2 x 10(-4)cm(-1), 83+/-2 x 10(-4)cm(-1), 238+/-2 x 10(-4)cm(-1), 76+/-2 x 10(-4)cm(-1), 13+/-1 x 10(-4)cm(-1) for site II, respectively. The optical absorption study of the crystal is also done. The observed bands are assigned as transitions from the (6)A(1g)(S) ground state to various excited quartet levels of a Mn(2+) ion in a cubic crystalline field. These bands are fitted with four parameters B, C, D(q) and alpha and the values found for the parameters are B=777 cm(-1), C=3073 cm(-1), D(q)=755 cm(-1), and alpha=76 cm(-1). On the basis of the data obtained the surrounding crystalline field and the nature of metal-ligand bonding are discussed.
在室温下对掺锰（Ⅱ）的磷酸二氢钠二水合物（SHOD）单晶进行了电子自旋共振（ESR）研究。利用在外部磁场不同取向时观测到的大量共振线位置，对锰（Ⅱ）的自旋哈密顿参数进行了评估。对于I位，g、A、B、D、E和a的值分别为：2.0042±0.0002、86±2×10⁻⁴cm⁻¹、83±2×10⁻⁴cm⁻¹、238±2×10⁻⁴cm⁻¹、76±2×10⁻⁴cm⁻¹、13±1×10⁻⁴cm⁻¹；对于II位，相应的值分别为2.0032±0.0002、86±2×10⁻⁴cm⁻¹、83±2×10⁻⁴cm⁻¹、238±2×10⁻⁴cm⁻¹、76±2×10⁻⁴cm⁻¹、13±1×10⁻⁴cm⁻¹。还对该晶体进行了光吸收研究。观测到的谱带被指定为在立方晶体场中，锰（Ⅱ）离子从基态（⁶A₁g）（S）到各种激发四重态能级的跃迁。这些谱带用四个参数B、C、D（q）和α进行拟合，得到的参数值为B = 777 cm⁻¹、C = 3073 cm⁻¹、D（q） = 755 cm⁻¹、α = 76 cm⁻¹。根据所获得的数据，讨论了周围的晶体场以及金属 - 配体键合的性质。
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