Remplacement d'un phosphorimètre/ Replacement of a phophorimeter

这是要求更换磷光度计的请求。该仪器由一个脉冲光源、一个激发单色仪、一个样品室、一个发射单色仪和一个检测器组成。在光激发时，样品吸收给定波长的光，并可能作为弛豫过程重新发射光。其中一种发射的光被称为磷光；另一种叫做荧光。因此，人们可以利用这种现象来监测分子或材料在光激发下的行为。该仪器的关键部分是脉冲源，通常从1微秒开始。然后可以监测发出的磷光强度随时间的变化，并提取其寿命。人们还可以记录延迟时间大于1微秒的（磷光）光谱，并监测光谱随时间的演变，从而可以看到是否有多个物种参与弛豫过程。该研究的目标是设计用于光电池应用的新型聚合物和用于析氢的新型光催化剂。在光电池设计中，分子和聚合物被合成并分析其发射特性，包括荧光和磷光。光电池的效率将取决于光能在材料中吸收和分布的速度，以及电子转移、产生电流的速度。在光致析氢方面，效率将取决于光催化剂内部相同的参数。后者是由铂络合物，这是众所周知的析氢。含有重金属的材料容易发出磷光。为了测量化合物材料中激发能迁移和电子转移的速率，必须监测磷光（和荧光）性质（强度和光谱）。这台仪器是专门研究磷光的。

This request is for the replacement of a phosphorimeter. This instrument consists of a pulsed source of light, an excitation monochromator, a sample chamber, an emission monochromator, and a detector. Upon light excitation, the sample absorbs this light at a given wavelength and may re-emit light as a processus of relaxation. One type of emitted light is called phosphorescence; the other one is called fluorescence. Therefore one can used this phenomenon to monitor the behaviour of the molecule or the material upon light excitation. The crucial part of this instrument is the pulsed source, typically starting at 1 microsecond. One can then monitor the intensity of the emitted phosphorescence vs time and extract its the lifetime. One can also record the (phosphorescence) spectra at delay time greater than one microsecond and monitor the evolution of the spectra with time hence allowing to see whether more than one species is involved in the relaxation process. The goal of the research is to design new polymers for photocell applications and new photo-catalysts for hydrogen evolution. In photocell design, molecules and polymers are synthesized and analyzed for their emission properties, including both fluorescence and phosphorescence. The efficiency of the photocells will depend on the speed at which the light energy is aborbed and distributed in the material and at which the electron transfer, inducing an electric current, is done. On the photoinduced hydrogene evolution side, the efficiency will depend on the same parameters within the photocatalysts. The latters are made of platinum complexes which is well known of hydrogen evolution. With heavy metals, materials are prone to exhibit phosphorescence. In order to measure the rates of excitation energy migration and electron transfer in a material of a compounds, the monitoring of the phosphorescence (and fluorescence) properties (intensity and spectra) is necessary. This instrument is dedicated to phosphorescence.