A liquid flatjet system for solution phase soft-x-ray spectroscopy.
A liquid flatjet system for solution phase soft-x-ray spectroscopy.
复制标题
用于溶液相软X射线光谱的液体扁平机系统。
DOI：
10.1063/1.4928715
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发表时间：
2015-09
期刊：
影响因子：
--
通讯作者：
Nibbering ET
中科院分区：
文献类型：
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作者：
Ekimova M;Quevedo W;Faubel M;Wernet P;Nibbering ET
我们提出了一种用于溶液相软x射线光谱的液体平喷系统。flatjet装置利用了两个相同的层流射流碰撞后形成稳定液体片的现象。从50 μm喷嘴喷出的两股单股水射流在48°冲击角下发生碰撞，形成双层结构，第一层长4.6mm，宽1.0mm。液体flatjet在真空条件下（<10−3 mbar）完全工作，允许在透射模式下对水溶液进行软X射线光谱分析。我们分析了液态水flatjet厚度在大气压下使用干涉或中红外透射测量和真空条件下通过测量的O K-边的水在传输中的吸收率，并将我们的结果与以前发表的数据与Si 3 N4膜窗口的站立细胞。第一层液膜的厚度在1.4-3 μm之间变化，取决于液膜的横向和纵向位置。我们观察到，在1巴和真空条件下，导出的厚度具有相似的量级。收集器单元便于溶液的回收，允许对小样品体积（约10 ml）进行测量。我们证明了这种方法的适用性，提出测量的N K-边缘的水NH 4+。我们的研究结果表明，在软X射线制度的稳态和时间分辨研究中使用液体flatjet的高潜力。
We present a liquid flatjet system for solution phase soft-x-ray spectroscopy. The flatjet set-up utilises the phenomenon of formation of stable liquid sheets upon collision of two identical laminar jets. Colliding the two single water jets, coming out of the nozzles with 50 μm orifices, under an impact angle of 48° leads to double sheet formation, of which the first sheet is 4.6 mm long and 1.0 mm wide. The liquid flatjet operates fully functional under vacuum conditions (<10−3 mbar), allowing soft-x-ray spectroscopy of aqueous solutions in transmission mode. We analyse the liquid water flatjet thickness under atmospheric pressure using interferomeric or mid-infrared transmission measurements and under vacuum conditions by measuring the absorbance of the O K-edge of water in transmission, and comparing our results with previously published data obtained with standing cells with Si3N4 membrane windows. The thickness of the first liquid sheet is found to vary between 1.4–3 μm, depending on the transverse and longitudinal position in the liquid sheet. We observe that the derived thickness is of similar magnitude under 1 bar and under vacuum conditions. A catcher unit facilitates the recycling of the solutions, allowing measurements on small sample volumes (∼10 ml). We demonstrate the applicability of this approach by presenting measurements on the N K-edge of aqueous NH4+. Our results suggest the high potential of using liquid flatjets in steady-state and time-resolved studies in the soft-x-ray regime.