transition

Table of Contents

Introduction References & Edit History Related Topics

Discover

Alpaca and Llama side by side

What’s the Difference Between Llamas and Alpacas?

NBA Lakers Celtics Finals Kevin Garnett shooting.

10 Great Sports Rivalries

Cathedrale St.Jean in Lyon, France has a 14th-century astronomical clock that shows religious feast days till the year 2019; Perpetual Calendar

Ten Days That Vanished: The Switch to the Gregorian Calendar

Aurochs. Bos primigenius. Skeleton. Extinct animal. Skeleton of an Aurochs, an extinct wild ox.

6 Animals We Ate Into Extinction

Periodical Cicada, Adult, Magicicada spp. Requires 17 years to complete development. Nymph splits its skin, and transforms into an adult. Feeds on sap of tree roots. Northern Illinois Brood. This brood is the largest emergence of cicadas anywhere

Why Do Some Cicadas Appear Only Every 17 Years?

Close up of books. Stack of books, pile of books, literature, reading. Homepage 2010, arts and entertainment, history and society

12 Novels Considered the “Greatest Book Ever Written”

Germans from East and West stand on the Berlin Wall in front of the Brandenburg Gate in the November 10, 1989, photo, one day after the wall opened.

Timeline of the 1980s

transition: Related Content

Written and fact-checked by The Information Architects of Encyclopaedia Britannica

Topics

selection rule superallowed transition allowed transition electric monopole transition forbidden transition oscillator strength energy level Aufbau principle excitation optical pumping population inversion electronic configuration metastable state Franck-Hertz experiment absorption edge

Key People

Kenneth Geddes Wilson

American physicist

Quiz

Italian-born physicist Dr. Enrico Fermi draws a diagram at a blackboard with mathematical equations. circa 1950.

Physics and Natural Law