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Chapter VI UV-Vis Spectroscopic…. The SHG efficiency is estimated with respect to standard KDP and listed in table (6.1) for different samples. It can be noticed from table (6.1) that as the doping of L-histidine, L-threonine and DL-methionine increases in KDP crystals, the SHG efficiency increases. The amino acid doping is beneficial for SHG efficiency. The SHG of the doped crystals is found to be more than the pure one. Table: 6.1 SHG efficiency of pure, L-histidine, L-threonine and DL-methionine doped KDP crystals. Samples SHG Efficiency Pure KDP Crystal 1 KDP + 0.3% L-histidine 1.33 KDP + 0.4% L-histidine 1.61 KDP + 0.5% L-histidine 1.80 KDP + 0.3% L-threonine 1.11 KDP + 0.4% L-threonine 1.24 KDP + 0.5% L-threonine 1.46 KDP + 0.3% DL-methionine 1.17 KDP + 0.4% DL-methionine 1.26 KDP + 0.5% DL-methionine 1.71 Attempts have been made to explain the origin of optical non-linearity in terms various chemical bond contributions. Lin et al [35] studied the mechanism of the optical behavior of KDP crystals theoretically by using the plane wave pseudo-potential total energy software package. The origin of non-linear effects has been explained through the real space atom cutting analysis of KDP. The contribution of PO4 group to the SHG effects is dominant. And the hydrogen bonds contribute much for birefringence. In another study, Xue and Zhang [36] have studied the hydrogen bonds such as O-H---O, N-H---O in KDP and ADP. The second order NLO behavior of crystals studied and it is found that hydrogen bonds play very important roles in NLO contributions to the total nonlinearity. Moreover, Xue and Ratajczak 235
Chapter VI UV-Vis Spectroscopic…. [37] studied the effects of hydrogen bonds in ADP crystallographic frame on its optical properties, such as, static polarizabilities and first hyperpolarizabilities by quantum chemical calculations. As it has been discussed in Chapter-III that amino acids are expected to interact through hydrogen bonds with KDP, which is reflected in FTIR spectra of amino acids doped KDP crystals with respect to pure KDP crystals. The increase in SHG efficiency of amino acids doped KDP crystals may be due to interaction of amino acids with KDP through hydrogen bonds. This favorable condition may be responsible for the increase in SHG efficiency on doping of amino acids. 6.6 UV-Vis Spectroscopic Study Ultraviolet-visible (UV-Vis) spectroscopy involves electro-magnetic radiation in the UV-visible region (UV region 200-400 nm and visible region 400-800 nm). The absorption in the visible ranges directly affects the color of the compound or sample involved. In this region of the electromagnetic spectrum, molecules undergo electronic transitions. UV-Vis spectroscopy is routinely used in the quantitative determination of solutions of transition metal ions and highly conjugated organic compounds. Organic compounds, especially those with a high degree of conjugation, also absorb electromagnetic radiation in the UV or visible regions of the electromagnetic spectrum [38]. Different molecules absorb radiation of different wavelengths. An absorption spectrum will show a number of absorption bands corresponding to structural groups within the molecule. For example, the absorption that is observed in the UV region for the carbonyl group in acetone is of the same 236
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Saurashtra University Re - Accredit
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Statements Under O. Ph.D.7 of Saura
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ACKNOWLEDGEMENT The author expresse
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in-law, Mother- in -law and all oth
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of NLO materials in rapidly develop
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doped samples in comparison to the
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micro-hardness decreases. Also, as
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Papers Published in National and In
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Seminar on Recent Advances in Conde
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Chapter I Brief Introduction... Cha
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Chapter II Solution Growth…. Tabl
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Chapter VIII Micro-hardness studies
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