光波长对平板反应器成膜及产氢特性影响

实验研究了不同光波长对生物膜平板反应器中光合细菌(Rhodopseudomonas palustris CQK 01)吸附、生长及产氢性能的影响。结果表明:在相同条件下,波长为590 nm时形成的生物膜具有最大的细菌覆盖率和生物膜密度,以及较高的产氢性能。不同光波长条件下形成的生物膜均在运行入射光波长为590 nm时产氢速率达到最大。在最佳光波长条件下,底物浓度为60 mmol/L时得到最大产氢速率11.2 mmol/(m~2·h)。     

1,8-萘酰亚胺荧光单体的合成及光谱的量子化学研究

以4-溴-1,8-萘二甲酸酐和N-甲基哌嗪为原料,合成了3种水溶性1,8-萘酰亚胺荧光单体,并以红外光谱、氢核磁共振谱、质谱及元素分析对产物进行了表征,测定了它们的激发光谱和发射光谱.运用PM3方法对这3种化合物的基态和激发态进行了几何构型全优化.结构分析表明:基态下,3种荧光单体的环均处于同一平面,且体系为较大的共轭...     

偏振无关的波长间隔可调的全光纤双折射滤波器

 设计了一种新的便于调谐且波长间隔可调的全光纤双折射滤波器。该滤波器由一个偏振分束器（PBS）、2段保偏光纤（PMFs）和4个二分之一波片（HWPs）连接而成。计算并分析了它的理论结果,发现在合理调节环中4个二分之一波片的情况下,该滤波器除了可以获得有很好的滤波光谱输出之外,还具有波长间隔可调的作用。这种滤波器在设计可灵活改变波长间隔的多波长光纤激光器及光纤系统等方面具有巨大的应用前景。     

Ozone profiles retrieval from SCIAMACHY Chappuis-Wulf limb scattered spectra using MART

The Scanning Imaging Absorption spectroMeter for Atmospheric ChartographY(SCIAMACHY) instrument,launched on the Envisat satellite in March 2002,measures the earthshine radiance,simultaneously from the ultraviolet(UV) to the near infrared(NIR),in the three viewing geometries:nadir,limb,and occultation.These measurements are used to retrieve both the total amount and vertical profiles of a large number of atmospheric constituents.In this paper,stratospheric ozone profiles between 15 and 40 km altitude are ret...     

甚长波宽波段(6.4~15μm)红外探测器响应光谱特性的测量

使用傅里叶变换光谱仪(FTIR)测试甚长波宽波段(6.4~15μm)红外探测器响应光谱的过程中,发现短波方向响应光谱异常。通过分步测试分析发现:探测器和放大器工作在非线性工作区导致某些情况下仪器信号发生饱和,引起了短波方向响应光谱畸变的现象。对FTIR测量甚长波宽波段(6.4~15μm)红外探测器响应光谱的畸变现象进行了分析,认为探测器的响应时间是影响其响应光谱的重要因素,并通过试验确定了测试系统对不同探测器所设置的测试参数,消除了响应光谱畸变的现象,并提高了测试准确度。     

High performance infrared detectors compatible with CMOS-circuit process

A type of Si-based blocked impurity band photoelectric detector with a planar architecture is designed and demonstrated by a modified silicon semiconductor processing technique. In this route, multiple ion implantation is utilized to ensure the uniform distribution of the P elements in silicon, and rapid thermal annealing treatment is used to activate the P atoms and reduce damages caused by ion-implantation. The fabricated prototype device exhibits an excellent photoelectric response performance. With a direct current(DC) bias voltage of-2.3 V, the device detectivity to blackbody irradiation is as high as 5×10~(13) cm·Hz~(1/2)/W, which corresponds to a device responsivity of nearly 4.6 A/W, showing their potential applications in infrared detection, infrared astrophysics, and extraterrestrial life science. In particular, the developed device preparation process is compatible with that for the CMOS-circuit, which greatly reduces the manufacturing cost.     

Synthesis of Thin Bi9O7.5S6 Nanosheets for Improved Photodetection in a Wide Wavelength Range

Bismuth-based compounds possess layered structures with a variety of stacking modes, endowing the compounds with diverse properties. As one type of bismuth oxysulfides, Bi₉O_7.5S₆ nanocrystals has great applications in photodetection; however, the responsivity of bulky Bi₉O_7.5S₆ is limited due to the poor charge separation. Herein, single-crystalline Bi₉O_7.5S₆ thin nanosheets are successfully synthesized by using a solvothermal method. The thickness of the obtained Bi₉O_7.5S₆ nanosheets is down to 15 nm and can be easily tuned by varying the reaction period. Moreover, the Bi₉O_7.5S₆ nanosheets show strong light absorption in the visible and near infrared range, making it a promising candidate in optoelectronics. As a demonstration, the thin Bi₉O_7.5S₆ nanosheets are used as active layer in an optoelectronic device, which exhibits sensitive photoelectric response to light in a wide range of 400–800 nm. The responsivity of the device reaches up to 1140 μA W⁻¹, and the performance of the device is stable after long-period illumination. This work demonstrates a great potential of the thin Bi₉O_7.5S₆ nanosheets in optoelectronic devices, and these nanosheets may also be extended to various optoelectronic applications.     

弦线上波的传播规律实验装置的改进

对传统的验证弦线上横波的传播规律实验中的波源进行改进，采用单片机控制的可连续调节频率的装置，可以得到横波的波长与弦线中的张力、弦线的线密度及振动频率的关系，使得验证弦线上横波的传播规律的实验内容更加丰富。     

纳秒光场下原子团簇产生高离化Kr离子的激光波长效应

利用不同波长和光强的纳秒激光,对Kr原子团簇进行了激光电离的飞行时间质谱研究,观察到Kr高价离子价态显著地依赖于激光波长,当分别用波长为1064,532,355和266 nm的激光照射Kr原子团簇时,可分辨的离子最高价态分别为+17,+11,+4和+2价;然而离子价态与激光功率密度的依赖关系并不明显。实验结果支持多光子电离-逆轫致吸收加热-电子碰撞电离三步电离模型,表明电子碰撞电离是高价离子产生的主要途径。     

RbPb2Cl5的合成及光学性质

采用机械研磨的方法, 通过控制反应前驱体的摩尔比, 研究了不同球磨时间对形成RbPb₂Cl₅晶体的影响. X射线衍射结果表明, 经过1 h的研磨可制备纯相RbPb₂Cl₅晶体粉末, 其结构为通过边共享相连接的 [Pb-Cl₇]十面体, 归属于单斜晶系P2₁/c空间点群. RbPb₂Cl₅晶体在紫外区有明显的吸收, 其带边吸收值为 3.82 eV. 在光激发条件下, 该晶体显示激发波长依赖的540 nm黄绿光和635 nm橙光的双波长荧光. 变温光谱、 时间分辨光谱和发射峰强度与能量密度依赖的线性关系研究表明, 其发光机制应该归结于材料具有两种不同的自陷激子态, 从而产生了与激发波长相关的双通道发射.