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光吸收带
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  absorption band
    Origin of the 300nm Absorption Band in PbF 2 Crystals
    氟化铅晶体中300nm光吸收带的起因
短句来源
    A 300nm absorption band was found in the transmission spectra of PbF 2 crystal. It is characterized by the decrease of its intensity from the beginning of growth to finishing end of the grown crystal.
    在 Pb F2 晶体的透射光谱中常存在一个300nm 光吸收带,其特征是吸收强度从结晶开始端向结晶结束端递减。
短句来源
    According to AAS analysis results,there are more content of Ca and Ba impurities in the crystal with 300nm absorption band than those without this absorption. However,based on doping experiments and similar absorption phenomenon existing in other fluoride crystals,trace Ce 3+ impurities was suggested to be associated with this absorption,and the former conclusion that Ca and Ba ions was ascribed to be responsible for this absorption band was denied.
    利用原子吸收光谱分析( A A S) ,发现具有300nm 光吸收带的晶体含有比较多的杂质离子 Ca 和 Ba ,但根据掺杂实验及其它氟化物晶体中存在的类似吸收现象,排除了 Ca 和 Ba 是造成这一吸收现象的原因,而是认为 Ce3 + 离子杂质的4f→5 d 跃迁是造成该吸收带的原因。
短句来源
    The calculated result is coincident with experiments very well, which supports the proposal that no relaxed oxygen deficient center is the defect precursors of 5.0 eV absorption band in fused silica.
    理论结果与实验结果符合得比较好 ,从而支持了非弛豫氧空位缺陷态是石英玻璃中 5.0 e V光吸收带的起源的观点
短句来源
    It was also found that the absorption band corresponding to azobenzene group in intercalated GTL shifted towards longer wavelength by 91 nm as compared with pure GTL, which could be ascribed to the strong conjugation of GTL supramolecular order structure (J cluster) confined in a nanoscale space of montmorillonite interlayer gallery.
    由于GTL在纳米受限空间的超分子有序结构共轭 ,使偶氮基团的光吸收带发生了高达 91nm的显著红移 .
短句来源
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    The results indicate that the Ni-doped TiO_2 photocatalysts prepared by low temperature combustion synthesis shift the optical absorption threshold to visible light,the band gap of 0.4 Ni-TiO_2(atomic ratio) is 2.3 eV,which corresponds to a 564nm threshold in the visible light range.
    结果表明,相对P25而言,Ni掺杂TiO2的光吸收带边红移,当Ni/Ti原子比为0.4时,催化剂的带隙宽度为2.3eV,对应的吸收带边为564nm;
短句来源
    Based on the concentration of no relaxed oxygen deficient center obtained from experiments and the density of states of conduction band electrons calculated by the first principles, the 5.0 eV linear absorption coefficient of fused silica is presented.
    从吸收强度的角度出发研究石英玻璃中 5.0 e V光吸收带的起源。 利用实验和理论给出的非弛豫氧空位缺陷态的能级 ,并以第一原理计算得到的石英玻璃导带电子态密度为基础 ,计算了 5.0 e V线性吸收系数。
短句来源
    XPS results show that N and Ti concentration decrease while Cl and O concentration increase as the time of HC1 vapor exposure increases,indicating strong interaction between HC1 and TiOPc.
    此峰的出现使得酞菁氧钛光吸收带 (Q带 )加宽进入红外波段。 光电子谱分析表明酞菁氧钛薄膜的成分发生了变化 ,其中Cl和O的含量随HC1蒸气处理时间的增加而增加 ,而N和Ti的含量随HC1蒸气处理时间的增加而减小 ,说明HC1蒸气可与真空蒸发沉积的酞菁氧钛薄膜发生作用。
短句来源
    The bands are assigned to electrons trapped at oxygen vacancies nearest to Zr cations (Ftype centers) and to oxygen ions with trap holes adjacent to yttria cations (Vtype centers). 
    光吸收带可能与Zr阳离子最近邻的氧空位捕获电子形成的F型色心和Y阳离子近邻的氧离子捕获空穴形成的V型色心有关。
短句来源
    DRS are used to investigate the ability of absorbing light and the shift of spectrums of TiO2 and doped TiO2. The results show doping makes the light absorption increase and the spectrums of 1.5Y3+/TiO2 and 3.0Y3+/TiO2 both show red shift.
    用DRS表征微粒的光吸收能力和光吸收带边移动情况,发现掺杂导致了TiO2光吸收能力增强及吸收带边红移。
短句来源
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  absorption band
A retinal analog in which the β-ionone ring is replaced by ferrocene moiety forms a stable chromoprotein with the main absorption band at 483 nm and a shoulder near 590-610 nm.
      
For 5 min irradiation, the photochemical activity in the absence and in the presence of dithionite decreased by 35 and 72%, respectively (this was accompanied by an irreversible bleaching of the pheophytin Qx absorption band at 542 nm).
      
Induced Absorption Band of Holotransketolase and Its Interpretation
      
As regards the new absorption band induced by ThDP binding, its nature, until recently, remained unknown.
      
Coherent oscillations were studied in the kinetics at 935 nm (P* stimulated emission band), at 1020 nm (BA- absorption band), and at 760 nm (HA absorption band).
      
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he phase-resolved photoacoustic spectroscopyhas been used to analyse the pigmental distri-bution in intact plant leaves and has been com-pared with the photoacoustic phase spectrumof the leaves. The inverse correlation betweenthe photoacoustic phase spectrum and absorp-tion bands of chloroplasts has been observed.The characteristic valley exists in the photoa-coustic phase spectrum of the leaf cuticle. Inaddition, there are some differences in thephotoacoustic phase spectra obtained at differ-ent modulation...

he phase-resolved photoacoustic spectroscopyhas been used to analyse the pigmental distri-bution in intact plant leaves and has been com-pared with the photoacoustic phase spectrumof the leaves. The inverse correlation betweenthe photoacoustic phase spectrum and absorp-tion bands of chloroplasts has been observed.The characteristic valley exists in the photoa-coustic phase spectrum of the leaf cuticle. Inaddition, there are some differences in thephotoacoustic phase spectra obtained at differ-ent modulation frequency. The phenomenashow that photoacoustic phase spectra can alsobe used for the nondestructive depth-profileanalyses of biological sample as good as pho-toacoustic spectroscopy.

用相位解析法获得的未损伤植物叶片叶肉组织的光声光谱,与叶片的光声相位谱进行了比较.发现植物叶片的光声相位谱与叶绿体光吸收带之间呈现互补关系.叶片表皮的光声相位谱存在持有的波谷结构.不同调制频率的光声相位谱有较大的差异.这些现象表明光声相位谱与光声光谱一样,也可对未损伤的层状生物样品作深度剖面分析.

Abstract The absorption band due to the aggregate of silver particles in silver sol prepared by modifying the identical procedure of silver sol, was observed at 435.0 nm without the presence of any molecules and spilt with the other band in the lower wavelength region. The splitting process of the two band is well constituent with the current electromagnetic theory of aggregated silver sols.

SERS活性体系中光吸收带电磁和化学增强机制归属的认证研究方炎王四海(首都师范大学综合技术研究所,北京100037)AssignmentofEMandCTEnhancementsonOpticalAbsorptionSpectraofColoidal...

A 300nm absorption band was found in the transmission spectra of PbF 2 crystal.It is characterized by the decrease of its intensity from the beginning of growth to finishing end of the grown crystal.According to AAS analysis results,there are more content of Ca and Ba impurities in the crystal with 300nm absorption band than those without this absorption.However,based on doping experiments and similar absorption phenomenon existing in other fluoride crystals,trace Ce 3+ impurities was suggested to be associated...

A 300nm absorption band was found in the transmission spectra of PbF 2 crystal.It is characterized by the decrease of its intensity from the beginning of growth to finishing end of the grown crystal.According to AAS analysis results,there are more content of Ca and Ba impurities in the crystal with 300nm absorption band than those without this absorption.However,based on doping experiments and similar absorption phenomenon existing in other fluoride crystals,trace Ce 3+ impurities was suggested to be associated with this absorption,and the former conclusion that Ca and Ba ions was ascribed to be responsible for this absorption band was denied.The 300nm absorption band originates from the transition 4 f →5 d of Ce 3+ ions.Ce 3+ impurities in PbF 2 crystal can trace back to the raw mineral,CaF 2,which was used to produce HF,one of the starting materials to synthesize PbF 2.By specially purification on HF,the 300nm absorption band was overcome from the grown PbF 2 crystals.

在 Pb F2 晶体的透射光谱中常存在一个300nm 光吸收带,其特征是吸收强度从结晶开始端向结晶结束端递减。利用原子吸收光谱分析( A A S) ,发现具有300nm 光吸收带的晶体含有比较多的杂质离子 Ca 和 Ba ,但根据掺杂实验及其它氟化物晶体中存在的类似吸收现象,排除了 Ca 和 Ba 是造成这一吸收现象的原因,而是认为 Ce3 + 离子杂质的4f→5 d 跃迁是造成该吸收带的原因。氟化铅晶体中的微量 Ce3 + 离子杂质来源于生产 H F 时所使用的天然矿物 Ca F2 。通过对 H F 这一制备 Pb F2 原料的高度提纯可以有效地消除晶体中的300nm 吸收带。

 
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