two-step Raman scatter

例句：

1. 1. The two-step Raman scatter technique is used to analyze the molecular structure of organic compounds.
   两步拉曼散射技术用于分析有机化合物的分子结构。
2. 2. In this experiment, we used a two-step Raman scatter system to detect the presence of water vapor in the air.
   在这个实验中，我们使用了两步拉曼散射系统来检测空气中水蒸气的存在。
3. 3. The two-step Raman scatter spectrum shows that the sample contains both carbon and hydrogen.
   两步拉曼散射谱显示样品中含有碳和氢。