Chapter 3 The quest for the equilibrium structure of molecules

摘要: Publisher Summary This chapter explores that the determination of molecular structures has been one objectives high resolution spectroscopy for a long time. technique, together with gas phase electron diffraction, is only practical method available to study molecules in gaseous state. In state at sufficiently low pressures, are free from interactions other species and can therefore be studied isolated environment. It discusses modern tremendous resolving power precision. Conventional Stark effect modulated microwave typical 1 10 5 precision 6 . A similar achieved by Fourier transform infrared spectroscopy. laser based have close 8 If these spectroscopic methods coupled supersonic beam approaches 7 The also theoretical models fairly rigid molecules. With models, spectra observed such reproduced within experimental Many fitting parameters models—the constants—are obtained Among them rotational constants, which sometimes or more significant digits. reviews techniques used determine data. Principal obtain phase, diffraction discussed.