外猝滅 的英文怎麼說
中文拼音 [wàicùmiè]
外猝滅
英文
external quenching-
Quenching agents could be particularly effective in combination with ultraviolet absorbers.
猝滅劑與紫外線吸收劑並用時效果更為突出。We have prepared a series of neodymium binary / ternary complexes, such as nd ( acac ) 3 ' 2h2o, nd ( tfa ) 3 ' 2h2o, nd ( hfa ) 3 ' 2h2o, nd ( dbm ) 3 ' h2o, nd ( acac ) 3phen, nd ( tfa ) 3phen, nd ( hfa ) 3phen, nd ( dbm ) 3phen, nd ( tta ) 3 ( tppo ) 2, nd ( hfa ) 3 ( tppo ) 2, nd ( acac ) 4hpy, nd ( tta ) 4hpy and ndq3. the effects of organic ligands, synergistic coordination agents and different substitution groups for - diketones on effective line width and photoluminescence intensity of neodymium complexes were investigated. the photoluminescence spectra indicate that synergistic coordination agents can shield neodymium ion and impede water molecules penetrating into inner coordination shell to satisfy large coordination number of nd3 + during hydrous synthesis process, so the luminescence intensity of neodymium ternary complexes is stronger than that of neodymium binary complexes
發光光譜研究表明，由於協同試劑的參與，屏蔽了水分子參與配位，降低了羥基（ oh ）對釹離子激發態能級~ 4f _ （ 3 2 ）的猝滅，三元配合物的熒光強度均比二元配合物強，其中配合物nd （ tta ） _ 3 （ tppo ） _ 2在1340nm處的熒光強度最強，適合作為摻雜的光學活性物質，來制備有源光波導材料；在有水工藝條件下，單純地氟化配體未必能提高釹配合物的近紅外發光性能。The quenching centers aroused by mn2 + introduction merely quench the orange emission of colloidal zns : mn2 + nanocrystals. the quenching process of this kind of quenching centers, which reduce the energy of 4t1 level rather than that of conduction band, is different from that of the quenching centers eliminated by zn2 + introduction. the quenching data is analyzed considering the distribution of mn2 + additives adsorbed at the surface of colloidal nanoparticles
Mn ~ （ 2 + ）表面修飾引起的表面猝滅中心只對橙光發射有猝滅作用，這些猝滅中心和外加zn ~ （ 2 + ）消除的表面猝滅中心猝滅行為不同，它們只減少來自內部mn ~ （ 2 + ）雜質~ 4t _ 1能級上的，而不是zns基質導帶上的能量。Part ii this paper has minutely studied the interaction between au ( iii ) and serum albumin. the binding of au ( iii ) to human serum albumin ( hsa ) or bovine serum albumin ( bsa ) has been studied by equilibrium dialysis at ph ( 7. 43 + 0. 02 ). the scatchard analysis indicates that there exists several strong binding sites of au ( iii ) in both hsa and bsa. a notable hysteretic effect has been observed in the interaction of au ( iii ) with hsa or bsa using uv - visible spectrometry at ph ( 7. 43 + 0. 02 ), which shows that the binding between au ( iii ) with hsa or bsa may induce a slow transition of hsa or bsa from the conformation of weaker affinity for au ( iii ) to one of stronger affinity ( a - b transition ). the rate constants and activation parameters of this transition parameters of this tansition were measured and discussed. the binding equilibrium has project supported by the national science foundation of china ( no. 299621001 ), and the foundation for talents of the ten hunred thousand in guangxi
第二部分：生理ph （ 7 . 43 0 . 02 ）條件下，用平衡透析法和紫外光譜，熒光光譜研究了金（ ）與人血清白蛋白（ humanserumalbumin ，簡稱hsa ）或牛血清白蛋白（ bovineserumalbumin ，簡稱bsa ）的結合。 scatchard圖分析表明，金（ ）在hsa或bsa中有強弱兩類結合部位，通過計算機擬合獲得結合的逐級穩定常數值。利用熒光猝滅法計算出金（ ） - hsa和金（ ） - bsa體系的stem - volmer常數和雙分子猝滅速率常數。Carotenoids can make chla return from excited state to ground state by direct or un - direct quenching, in order to prevent algae from photooxidation. on the other hand, it was indicated that polysaccharides have functions in resisting uv. spirulina plalensis can accumulate both cellular and extracellular polysaccharides during uv treatment, it showed highest uv resistant ability ; nanochloropsis sp also can accumulate cellular polysaccharides, while extracellular polysaccharides reduced ; the cellular polysaccharides content of phaeocystis globosa scherffel decreased and extracellular polysaccharides content did not increased markedly, showing lowest uv resistant ability
鈍頂螺旋藻和微綠球藻中在較低的uv輻射強度下類胡蘿卜素含量升高，而葉綠素a保持相對穩定，說明類胡蘿卜素可能對藻類起到一定保護作用，可能通過直接的或間接的方式猝滅激發態的葉綠素，來保障光合作用的進行；本實驗發現多糖的累積和分泌與藻體的抗uv能力有相關，鈍頂螺旋藻的細胞內和細胞外多糖分泌旺盛，其抗uv能力最強；微綠球藻體內能積累多糖，而胞外多糖分泌減少；球形棕囊藻的胞內多糖含量減少，胞外多糖含量增加也不明顯，其抗uv能力最弱。We also have analyzed the photoluminescence ( pl ) spectra of some zno films, it turns out that the emission of ultraviolet light comes from the radiative recombination of excitons within nano - crystal energy band - gap, and the pl peaks move to smaller wavelength because zn are substituted by fe, co, and cu, which cause the size of the film grains smaller and the effective band - gap bigger. the red emission of zno films is due to, on the one hand, decrease of the film grains size which causes the emission intensity smaller and smaller until it disappears abruptly, on the other hand, the transition of electrons from deep donor level of the oxygen vacancies to the valence band
另外，我們還對薄膜光致發光性質進行了分析和研究，結果表明：納米結構zno薄膜的紫外發光來源於帶間激子的輻射復合發光， pl譜的帶邊發射峰發生藍移是由於fe 、 co 、 cu對zn的替代使薄膜粒子的尺寸減小，使薄膜的有效帶隙增寬； zno薄膜的紅色發光，一方面是zno顆粒尺寸的減少，帶間的激子發射峰越來越弱直至猝滅，另一方面主要是與zno晶格中的o空位有關，由深能級復合發光引起紅光發射。These quenching centers are most probably the mn2 + themselves, which can from mn - mn pairs so as to perform the energy migration from the interior mn2 + to the mn2 + adsorbed on the surface
考慮到外加mn ~ （ 2 + ）在納米顆粒表面有分佈（ poisson分佈） ，對猝滅數據進行了分析。We consider that surface state act as quenching centers. with the irradiation, the surface state decreases and therefore luminescence of mn2 + increases. reduction of quenching centers is the result of chemical change by obtaining energy from zns excited by uv light
熒光增強的原因是由於zns基質向mn2 +離子和表面態的能量傳遞是兩個相互競爭的過程，紫外光輻照下表面猝滅中心數目不斷減少從而mn2 +離子的發光增強。分享友人