Science. 1994 Jun 17;264(5166):1750-3. doi: 10.1126/science.264.5166.1750.
A procedure is described that uses two spectroscopic techniques, absorption and infrared degenerate four-wave mixing, in tandem (multiplex) to measure the transition dipole moments and absolute concentrations of molecular species in situ. The method is demonstrated by the measurement of the relative transition moments and concentrations of two dissimilar sample gas components, hydrogen chloride and nitrogen dioxide, but is applicable to a wide variety of molecules and, thus, can provide new information for transient molecular species. Further, difficulties in obtaining quantitative information through techniques such as laser-induced fluorescence, coherent anti-Stokes Raman scattering, and degenerate four-wave mixing spectroscopies can be overcome when a multiplex approach is used.
本文描述了一种串联（多路复用）使用两种光谱技术，吸收和红外简并四波混频，来原位测量分子种类的跃迁偶极矩和绝对浓度的方法。该方法通过测量两种不同样品气体成分（氯化氢和二氧化氮）的相对跃迁偶极矩和浓度来进行演示，但适用于各种分子，因此可以为瞬态分子种类提供新的信息。此外，当使用多路复用方法时，可以克服通过激光诱导荧光、相干反斯托克斯拉曼散射和简并四波混频光谱学等技术获得定量信息的困难。
