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guoqiusong銀蟲 (初入文壇)
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再求助一段有關(guān)拉曼光譜的文獻(xiàn)英譯中
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Fig. 4 shows the Raman spectra (LABRAMHR Confocal Laser MicroRaman spectrometer,514.5 nm, 250 mW) of the as-synthesized NiO nanorods. It can be seen that there are four Raman peaks at 420, 546, 712, and 1092 cm-1, espectively. Compared to the predicted data of cubic NiO single crystal [26], we can assigned the peaks at 420 and 546 cm-1 to the first-order transverse optical (TO) and longitudinal optical (LO) phonon modes of NiO, respectively. The emaining peaks at 712 and 1092 cm-1 can be assigned as combination of 2TO and 2LO, respectively, and are all shifted down in frequency about 68 cm-1. Since k = 0 phonons in the paramagnetic (cubic) phase transform as Γ-4 , no firstorder Raman scattering is expected. Therefore the observed first-order Raman peaks near the 420 (TO) and 546 cm-1 (LO) must derive from paritybreaking imperfections [26]. This conclusion is confirmed by the enhancement of the first-order Raman scattering in the black NiO, where the nickel vacancy concentration is high. The combination Raman scattering trends to vanish at the C point but is usually strong elsewhere in the Brillouin zone. This explains why the combination peaks are all shifted down in frequency, since both LO and TO branches are expected to be depressed in frequency away from the zone center. （Chemical Physics Letters 362 (2002) 119–122） |
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guoqiusong(金幣+5, 翻譯EPI+1): 2010-04-25 09:21
guoqiusong(金幣+5): 2010-05-07 10:42:16
guoqiusong(金幣+5): 2010-05-07 10:42:16
| 圖4所示為合成的養(yǎng)花鎳納米棒的拉曼譜。可以看出有四個(gè)拉曼峰，分別位于 420, 546, 712, and 1092 cm-1, 。與預(yù)測(cè)的立方氧化鎳單晶的拉曼數(shù)據(jù)相比較，我們可以將712和1092cm-1的峰認(rèn)為是2TO 和2LO分別產(chǎn)生的，并且都向低頻移動(dòng)了大約68 cm-1。因?yàn)閗=0時(shí)立方相里面的光子轉(zhuǎn)變?yōu)棣?4，不會(huì)出現(xiàn)第一序拉曼散射。因此觀察到的位于420和546的兩個(gè)第一序的拉曼風(fēng)必然是由部分分別的不連續(xù)造成的�！�26】這一結(jié)論由黑氧化鎳（鎳的空位濃度很高）第一序拉曼散射增強(qiáng)可得到證明。這種組合的拉曼散射在C點(diǎn)趨向于消失而在Brillouin區(qū)域的其他地方通常是較強(qiáng)的。這解釋了為什么組合峰集體漂移，因?yàn)檫h(yuǎn)離區(qū)域中心LO 和 TO都將受到抑制。 |
2樓2010-04-25 07:11:17
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