Microwave spectroscopy is a method used to study the interaction of matter with microwave radiation. It is a powerful technique for analyzing the structure and composition of molecules, as well as studying various physical and chemical properties. In microwave spectroscopy, molecules are typically subjected to a beam of microwave radiation, causing specific transitions in the energy levels of the molecules. By measuring the frequencies at which these transitions occur, researchers can determine the molecular structure and properties of the sample under study. Microwave spectroscopy is commonly used in the fields of chemistry, physics, and materials science for a wide range of applications, including determining molecular structures, studying molecular rotations and vibrations, and characterizing complex biomolecules.