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首页> 外文期刊>Physica status solidi, B. Basic research >Ellipsometric study of electronic excitations in triglycine sulphate and triglycine selenate crystals
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Ellipsometric study of electronic excitations in triglycine sulphate and triglycine selenate crystals

机译:硫酸三甘氨酸和硒酸三甘氨酸晶体中电子激发的椭偏研究

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摘要

The real and imaginary parts of the pseudo-dielectricsusceptibility, ()OW and (x2)(E), of triglycine sulphate(TGS) and triglycine selenate (TGSe) ferroelectric crystalshave been obtained in the range 4-9.8 eV by spectroscopicellipsometry using the Berlin Electron Storage Ring forsynchrotron radiation source. A first maximum in (x2)(E) wasfound at E = 7.3 eV for both crystals and is attributed to theexcitation of p-electrons of oxygen. The spectra were measured at different temperatures in the range comprising the ferro-electric phase transition temperatures, 49 'V (TGS) and 22 ℃(TGSe). Of note is the peak-like behaviour in (xi)(T) and near the phase transition temperature and a considerabledecrease Mease (about 50%) of the reflected light intensity hz inthe range below the phase transition temperature (T < TO. Thelatter is probably caused by light scattering on the ferroelectricdomain walls.
机译:通过使用柏林分光光度法,在4-9.8 eV范围内获得了三甘氨酸硫酸盐(TGS)和三甘氨酸硒酸盐(TGSe)铁电晶体的准介电敏感性()OW和(x2)(E)的实部和虚部。电子存储环用于同步辐射源。两个晶体的(x2)(E)的第一最大值在E = 7.3 eV处发现,并且归因于氧的p电子激发。在包括铁电相变温度49'V(TGS)和22℃(TGSe)的范围内的不同温度下测量光谱。值得注意的是在(xi)(T)中且在相变温度附近的峰状行为,并且在相变温度以下(T

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