Quantum Physics of Light and Matter - Properties of the Electromagnetic Transitions

  • Luca Salasnich

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This video deals with the quantum properties of the three main kinds of electromagnetic transitions: absorption, spontaneous emission and stimulated emission. It is divided in 5 segments.

The first segment reviews the three main kind of electromagnetic transitions.

The second segment analyzes the selection rules of the electromagnetic transition in the case of the hydrogen atom.

The third segment introduces the two-level model and equations of Einstein in the study of the dynamics of the electromagnetic transitions.

The fourth segment describes the life time of an atomic state and the natural line width in the spontaneous emission.

The fifth segment discusses the experimental line width of the electromagnetic transitions and the broadening due to the collision between atoms and the Doppler effect.

Introduction

This video deals with the quantum properties of three main kinds of electromagnetic transitions: absorption, spontaneous emission and stimulated emission.

About The Author

Luca Salasnich

Luca Salasnich is an Associate Professor of Theoretical Physics of Matter at University of Padova, Italy. He was previously a research scientist with the Italian National Research Council (CNR). Dr. Salasnich was awarded an MSc in Physics by the University of Padova in 1991, and his PhD in Theoretical Physics by the University of Florence in 1995. His fields of research are condensed matter theory and statistical physics, in particular nonlinear phenomena and macroscopic quantum effects (like superfluidity and superconductivity) in ultra-cold atomic gases and other many-body systems. At the University of Padova, Dr. Salasnich is a member of the Scientific Committee of Area 2 (Physical Sciences) and President of the Teaching Council for the BSc in Optics and Optometrics. He has written more than 130 scientific papers for international journals, with over 2500 citations.

 

About this video

Author(s)
Luca Salasnich
DOI
https://doi.org/10.1007/978-3-030-63295-3
Online ISBN
978-3-030-63295-3
Total duration
45 min
Publisher
Springer, Cham
Copyright information
© The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Switzerland AG 2020

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Video Transcript

[MUSIC PLAYING]

In this video, I will discuss other important properties of the electromagnetic transitions. First, I will review the three main mechanisms of electromagnetic transitions, namely the spontaneous emission, the absorption, and the stimulated emission. Then, I will consider the selection rules in the electromagnetic transitions, in particular, the selection rules in the simplest case, namely, the hydrogen atom.

Then, I will consider the approach developed by Einstein that is called the two-level system approach. And I will discuss, in particular, the so-called Einstein equation for the electromagnetic transition for a two-level system. Then, I will consider the life time of a excited quantum state and its natural width associated to the transition from one state to another. I will also discuss the experimental line width, which is strongly affected by collision and Doppler effects.

I hope that you will enjoy this video.