Molecular Spectrocopy,1e

2

Atomic Structure and Atomic Spectra

CHAPTER OBJECTIVES

2.1 Introduction

2.2 History and Experimental results of Atomic Spectrum

2.3 Quantum Mechanical Model of Atom

2.4 Fine (Multiplet) Structure of Atomic Terms (States)

2.5 Hyperfine Structure of Spectral Terms

2.6 Genesis of the Periodic System of Elements

2.7 Intensity of Spectral Lines

2.8 Atomic Spectra

2.9 An Atom in Magnetic Field

2.10 An Atom in Electric Field (Stark Effect)

2.1 INTRODUCTION

The observation and interpretation of atomic and molecular spectra played a vital role in the development of quantum mechanics. The light from an electrostatic discharge through a tube containing a monatomic gas at low pressure shows a series of lines (groups) of very distinct in nature. These ...