基于离子注入技术的ZnMnO半导体材料的制备及光谱表征

通过离子注入技术制备了ZnMnO半导体材料，研究离子注入剂量与退火对材料光谱性质的影 响.Raman光谱研究发现，575cm^-1处声子模展宽是由高剂量Mn注入引起的缺陷所 致，退火样品528cm^-1振动模来自Mn相关的杂质振动.室温光致发光谱表明，退 火对高剂量注入样品的可见发光带有增强作用. 关键词： ZnMnO 离子注入 Raman光谱 室温光致发光     

胃癌组织的拉曼光谱初探

本文用ＦＴ－Ｒａｍａｎ光谱方法研究了４０例胃癌与胃正常组织,所得的光谱经统计处理的发现,肿瘤光谱中水、蛋白质有关的ＯＨ（ＮＨ）伸缩振谱带,Ｃ＝Ｏ伸缩振动,Ｈ－Ｏ－Ｈ变角振动谱带明显强于正常组织的光谱,造成这一现象的原因可能是水与蛋白相互作用及氢键结构在正常组织和肿瘤组织中不同所致。     

白云鄂博变生褐钇铌矿的Raman光谱和光致发光谱

测定了白云鄂博变生及退火结晶的褐钇铌矿和褐铈铌矿的Raman光谱，并讨论了结构、成分对Raman光谱的影响.它们的Raman光谱出现在840—600，340—280及200—50cm^-1的三个区，前两者为NbO^3-₄四面体的伸缩振动和弯曲振动频率，后者为稀土离子和NbO^3-₄四面体的外振动模式，通过对褐钇铌矿族矿物Raman光谱的比较分析，表明aman光谱可以有效地反映出该类矿物的结构畸变.还发现 关键词：     

稀土氟碳酸盐矿物的拉曼光谱研究

研究了氟碳钡铈矿Ｃｅ２Ｂａ［ＣＯ３］３Ｆ２、氟碳钙铈矿Ｃｅ２Ｃａ［ＣＯ３］３Ｆ２和氟碳铈矿Ｃｅ［ＣＯ３］２Ｆ等矿物的拉曼光谱特征。结果表明,钡稀土氟碳酸盐矿物（氟碳钡铈矿、氟碳铈钡矿、黄河矿）的Ｒａｍａｎ光谱特点是,ν１和ν２为单峰值,ν３和ν４为双峰值。钙稀土氟碳酸盐矿物（氟碳钙铈矿）的拉曼光谱带中ν１和ν４为双峰值,ν２和ν３为单峰值。稀土氟碳酸盐矿物（氟碳铈矿）的Ｒａｍａｎ光谱的特点是,ν１、ν２和ν４为单峰值,ν３为双峰值。     

离子注入诱导的具有两个不同发射波长的混合双量子阱结构

叙述了磷离子注入方法诱导具有不同发射波长的InGaAsP双量子阱结构的混合,并通过光致发光谱和断面透射电子显微术对量子阱混合的程度进行了研究。在特定条件下快速热退火处理后,光致发光谱显示,在离子注入剂量低于7×10¹¹/cm²情况下,两个阱的谱峰能保持较好的分离,注入剂量从10¹¹ /cm²增大到10¹²/cm²的过程中,两个阱的带隙蓝移值都似乎存在一个极大值,并且在同样的条件下,上阱(发射波长为1.52 μm)的带隙蓝移值较下阱(发射波长为1.59 μm)大些。当离子注入剂量达到10¹²/cm²时,上阱的谱峰近乎消失,双阱光致发光谱出现了一个谱峰。用断面透射电子显微术对原生长样品与带隙蓝移具有极大值的退火样品进行微结构比较,结果显示,对比原生长样品,退火样品的晶格原子基本得到修复,但阱与垒间的界面显得模糊,这说明离子注入导致两阱完全混合。     

ZnO-Si不同退火条件对生长ZnSe薄膜的影响

研究了作为缓冲层的ZnO薄膜在不同的退火时间、退火温度下退火对Si衬底上生长ZnSe膜质量的影响。当溅射有ZnO膜的Si(111)衬底的退火条件变化时，从X射线衍射谱（XRD）和光致发光谱（PL）中可见，ZnSe(111)膜的晶体质量有较大的变化。变温的PL谱表明，Si衬底上生长的具有ZnO缓冲层的ZnSe膜的近带边发射峰起源于自由激子发射。     

SiO_x∶H(0

采用退火后处理的方法，使ＳｉＯｘ∶Ｈ（０＜ｘ＜２）形成纳米硅与二氧化硅的镶嵌结构．利用红外透射谱、Ｒａｍａｎ谱和光致发光谱，系统地研究了不同退火温度对薄膜微结构及室温光致发光谱的影响．发现发光谱均由两个Ｇａｕｓｓ线组成，其中主峰随着退火温度的升高而红移，而位于８３５ｎｍ的伴峰不变．指出退火前在７２０—６１０ｎｍ的波长范围内强的主峰可能来源于膜中的非晶硅原子团，随退火温度的升高主峰的红移是由于非晶硅原子团的长大．而伴峰可能来自硅过剩或氧欠缺引入的某种发光缺陷．１１７０℃退火后在８５０ｎｍ附近出现强的谱带与纳米硅的析出有关，支持了量子限制效应发光模型．     

稀土氟碳酸盐矿物的光致发光谱和吸收谱研究

测定并讨论了产自四川冕宁矿区的氟碳铈矿和产自内蒙白云鄂博稀土矿区的黄河矿、氟碳钙铈矿、氟碳铈钡矿的光致发光谱。结果表明,稀土氟碳酸盐矿物在488.0nm和514.5nm激光激发下的光致发光中心是Nd3+,发光谱中的所有谱带均出自Nd3+的辐射跃迁。在488.0nm激光激发下,稀土氟碳酸盐矿物在495nm到733nm谱区的发光谱带强而尖锐,但在514.5nm激光激发下,这个谱区的谱带明显变弱或消失,转而出现783nm到907nm谱区的强发光谱带。可见光吸收谱表明稀土氟碳酸盐矿物对可见光的吸收也与矿物中的Nd3+有关。     

退火对ZnS/PS复合体系光致发光特性的影响

用脉冲激光沉积(PLD)技术以多孔硅(PS)为衬底生长了ZnS薄膜,分别测量了ZnS、PS以及ZnS/PS复合体系在室温下的光致发光(PL)光谱。结果发现,ZnS/PS复合体系的PL光谱中PS的发光峰位相对于新制备的PS有所蓝移。把该ZnS/PS样品分成三块,在真空400℃分别退火10,20,30 min,研究不同退火时间对ZnS/PS复合体系光致发光特性的影响。发现退火后样品的PL光谱中都出现了一个新的绿色发光带,归结为ZnS的缺陷中心发光。随着退火时间的延长,PS的发光强度逐渐降低且峰位红移。把ZnS的蓝、绿光与PS的红光相叠加,整个ZnS/PS复合体系在可见光区450~700 nm形成一个较宽的光致发光谱带,呈现较强的白光发射。     

一种基于朴素贝叶斯分类模型的高光谱矿物精确识别方法

由于某些矿物,特别是与成矿作用有关的热液蚀变矿物的光谱特征差异较小,更受到矿物混合光谱等因素的影响,导致大多数光谱识别方法对一些光谱特征相似的矿物极易出现混淆和误判现象。因此,针对矿物光谱的“同物异谱”、“同谱异物”现象,提出了一种基于朴素贝叶斯分类模型的高光谱矿物精确识别方法。通过对白云母、高岭石,这两种光谱特征相近的典型蚀变矿物的实验测试、分析,并与光谱角匹配、二进制编码、光谱特征拟合等同类方法进行对比,结果表明该方法能够充分地利用吸收特征波谷位置、吸收特征深度、包络线斜率等多种矿物光谱识别属性特征,进而将不同种类的矿物更明显地予以区分,具有较高的分类识别准确率。     

Characterization of Nd Doped Films Prepared by Femtosecond Pulsed Laser DepositionSCIEI北大核心CSCD

Thin films of Nd : YAG and Nd : Glass were prepared on Si (100) substrate by pulsed laser deposition technology. The morphology of film surface and cross section, composition, absorption spectrum and photoluminescence (PL) spectra of films were investigated by scanning electron microscope (SEM), energy disperse spectroscopy (EDS), Fourier transform infrared spectrometer(FTIR), optical parametric oscillator(OPO) and grating spectrometer. The results show that both Nd : YAG films and Nd : Glass films grown on the substrates at room temperature are amorphous. Nd : YAG films grown by PLD contain Nd element with 0. 15 at. % stoichiometric proportion. The absorption spectrum of bulk Nd : YAG target rather than deposited films exhibit two absorption peaks at 750 and 808 nm. There are no evident peaks in the photoluminescence spectra curve of Nd : YAG films. However, the photoluminescence spectra of Nd : Glass films with two sharp peaks at the wavelength of 877 and 1 064 nm are observed. It indicates that Nd is doped into glass host as optically active Nd3+ ions when Nd : Glass films grow at room temperature. But for Nd : YAG films, Nd don't incorporate into YAG host as Nd3+ ions.     

稀土氟碳酸盐矿物的振动光谱研究

利用红外光谱、拉曼光谱和X射线能谱研究了四川冕宁氟碳铈矿和内蒙白云鄂博稀土矿区的黄河矿、氟碳钙铈矿、氟碳铈钡矿的谱学特征。结果表明,振动光谱是表征稀土氟碳酸盐矿物结构和组分特征的有效手段。CO32-离子的ν3红外谱带或ν1拉曼谱带的频率位置、谱带分裂状况和谱峰数目取决于矿物分子中的CO32-离子数目。而CO32-离子的ν2红外谱带或ν4红外和拉曼谱带的特征可区分稀土氟碳酸盐矿物、钡稀土氟碳酸盐矿物和钙稀土氟碳酸盐矿物。发现氟碳酸盐矿物中混有少量的重晶石。     

Raman spectroscopic study of the uranyl titanate mineral euxenite (Y,Ca,U,Ce,Th) (Nb,Ta,Ti)2O6

Raman spectra of the uranyl titanate mineral euxenite were analysed and related to the mineral structure. A comparison is made with the Raman spectra of uranyl oxyhydroxide hydrates. The observed bands are attributed to the Ti O and (UO₂)²⁺ stretching and bending vibrations, as well as lattice vibrations of rare‐earth ions. The Raman bands of euxenite are in harmony with those of the uranyl oxyhydroxides. The mineral euxenite is metamict as is evidenced by the intensity of the U O stretching and bending modes, which are of lower intensity than expected, and with bands that are significantly broader. Copyright © 2010 John Wiley & Sons, Ltd.     

飞秒脉冲激光沉积钕掺杂薄膜特性研究

采用脉冲激光沉积(PLD)技术在Si(100)衬底上生长了Nd∶YAG薄膜以及Nd∶Glass薄膜,利用扫描电子显微镜(SEM)、能谱仪(EDS)、傅里叶变换红外光谱仪(FTIR)、光学掺量振荡器(OPO)以及光栅光谱仪等测试装置分析了薄膜的表面和断面结构形貌、组成成分、光学吸收谱以及光致发光谱。结果表明：在室温衬底温度下生长的Nd∶YAG薄膜以及Nd∶Glass薄膜均呈无规则非定型结构,没有明显的取向性微晶生长;PLD生长的Nd∶YAG薄膜中存在0.15 at.%化学计量比的Nd元素;Nd∶YAG块体靶材在750和808 nm有两个明显的吸收峰,而薄膜没有明显的吸收峰;Nd∶YAG薄膜在808 nm波长泵浦光下没有明显的光致发光谱峰,而Nd∶Glass薄膜在877和1 064 nm波长处有明显的光致发光谱峰。说明在室温衬底温度下生长的Nd∶Glass薄膜中Nd元素以Nd3+光学活性离子形式掺杂进玻璃基质中,而Nd∶YAG薄膜中的Nd元素没有以Nd3+光学活性离子形式掺杂进YAG基质中。     

白云鄂博天然钕独居石的振动光谱研究(英文)

Raman, infrared and energy dispersive X-ray spectra of monazites have been measured and discussed. The result shows that the mineral is enriched in cerium, lanthanum,neodymium and praseodymium (Ce＞La＞Nd＞Pr)， The monazites have marked spectral characteristics, especially their v1, V3 Raman bands and v1, v4 infrared absorption bands. The characteristics can distinguish between monazite and other phosphate minerals. In addition, based on EDS and infrared absorption spectra, a small amount of fluoro-carbonate is found in the monazites.     

Nd∶Y_3Al_5O_(12)单晶及纳米粉体的Raman光谱分析

测量了YAG（Y3Al5O12）/Nd∶YAG单晶、Nd∶YAG前驱物及其在不同温度下煅烧获得粉体的拉曼光谱,对谱峰的振动模式进行了指认,对结果进行了分析。Nd∶YAG前驱物在煅烧时,有一个由非晶态向晶态的转化过程;700℃下烧结前驱物获得非晶态产物的结构中含有AlO4四面体结构;随着煅烧温度的升高,拉曼光谱的变化主要表现在两个方面：一是谱峰半高宽（FWHM）减小,谱峰强度增大;二是一些拉曼光谱谱峰发生了频移,这是纳米多晶粉体的界面组元的有序度提高所致。另外,800℃下煅烧获得的Nd∶YAG纳米粉体的晶格振动模式与Nd∶YAG晶体的晶格振动模式存在差异,这是纳米多晶粉体的界面组元的贡献所致。     

Raman spectroscopic study of the uranyl titanate mineral betafite (Ca,U)2(Ti,Nb)2O6(OH): effect of metamictization

Raman spectra of the uranyl titanate mineral betafite were obtained and related to the mineral structure. A comparison is made with the spectra of uranyl oxyhydroxide hydrates. Observed bands are attributed to the (UO₂)²⁺ stretching and bending vibrations, U–OH bending vibrations and H₂O and (OH)^? stretching, bending and libration modes. U–O bond lengths in uranyls and O?H···O bond lengths are calculated from the wavenumbers assigned to the stretching vibrations. Raman bands of betafite are comparable with those of the uranyl oxyhydroxides. The mineral betafite is metamict as is evidenced by the intensity of the UO stretching and bending modes being of lower intensity than expected and by bands that are significantly broader.     

Raman spectroscopic study of the uranyl titanate mineral brannerite (U,Ca,Y,Ce)2(Ti,Fe)2O6:effect of metamictisation

Raman spectra of the uranyl titanate mineral brannerite were analysed and related to the mineral structure. A comparison is made with the Raman spectra of uranyl oxyhydroxide hydrates. The observed bands are attributed to the TiO and (UO₂)²⁺ stretching and bending vibrations, U OH bending vibrations, as well as H₂O and (OH)⁻ stretching, bending and libration modes. U O bond lengths in uranyls and O H···O bond lengths were calculated from the wavenumbers assigned to the stretching vibrations. Raman bands of brannerite are in harmony with those of the uranyl oxyhydroxides. The mineral brannerite is metamict, as is evidenced by the intensity of the UO stretching and bending modes being of lower intensity than expected and with bands that are significantly broader. Copyright © 2010 John Wiley & Sons, Ltd.