Chapter 2 Introduction to Optical Methods O The Nature of Radiant Energy ● Spectral Regions lNteraction of radiation with Atom and molecule PRactical Sources of radiation SPectrograph and MonochromatorChapter 2 Introduction to Optical Methods ⚫The Nature of Radiant Energy ⚫Spectral Regions ⚫Interaction of Radiation with Atom and Molecule ⚫Practical Sources of Radiation ⚫Spectrograph and Monochromator