物理
红外线的
订单(交换)
电介质
共振(粒子物理)
晶格振动
分析化学(期刊)
核磁共振
原子物理学
声子
凝聚态物理
光学
量子力学
化学
色谱法
经济
财务
作者
Wolfgang Kaiser,W. G. Spitzer,R. Kaiser,L. E. Howarth
出处
期刊:Physical Review
[American Physical Society]
日期:1962-09-15
卷期号:127 (6): 1950-1954
被引量:202
标识
DOI:10.1103/physrev.127.1950
摘要
Reflectivity and transmission measurements on Ca${\mathrm{F}}_{2}$, Sr${\mathrm{F}}_{2}$, and Ba${\mathrm{F}}_{2}$ have been studied to obtain information on the lattice vibrations. The reflection band in each material has been analyzed with classical dispersion theory. In order to fit the data, it was necessary to use one strong and one weak resonance in each case. The strong resonance is identified as the transverse optical mode of vibration for zero wave vector and is at 38.9, 46.1, and 54.3 \ensuremath{\mu} for Ca${\mathrm{F}}_{2}$, Sr${\mathrm{F}}_{2}$, and Ba${\mathrm{F}}_{2}$, respectively. The long-wavelength value for the dielectric constant obtained from the optical measurements indicated a disagreement with the published value for Sr${\mathrm{F}}_{2}$ obtained from capacity measurements. Capacity measurements were made and showed the previously accepted value for Sr${\mathrm{F}}_{2}$ to be in error. The transverse optical-mode frequencies are shown to agree very well with the spacing of some of the satellite lines in the emission spectrum of ${\mathrm{Sm}}^{++}$ in these fluorides.
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