Georg-August-Universität Göttingen, Institut für Physikalische Chemie, Tammannstr. 6, 37077 Göttingen, Germany.
J Chem Phys. 2013 Jul 14;139(2):024201. doi: 10.1063/1.4812772.
N2O/He gas mixtures are expanded through a 10 × 0.5 mm(2) slit nozzle and imaged by direct absorption vibrational spectroscopy, employing a HgCdTe focal plane array detector after interferometric modulation. N2O cluster formation in the free supersonic expansion is visualized. The expansion structure behind the frontal shock is investigated as a function of background pressure. At high pressures, a sequence of stationary density peaks along a narrow directed flow channel is characterized. The potential of the technique for the elucidation of aggregation mechanisms is emphasized.
N2O/He 气体混合物通过 10×0.5 毫米（2）狭缝喷嘴膨胀，并通过干涉调制后使用 HgCdTe 焦平面阵列探测器进行直接吸收振动光谱成像。可视化了在自由超声速膨胀中 N2O 团簇的形成。研究了背景压力对前缘激波后膨胀结构的影响。在高压下，沿狭窄导向流通道的一系列固定密度峰值的特征。强调了该技术在阐明聚集机制方面的潜力。
