population distribution in the excited states
1Music of the United States — American music redirects here. For other uses, see American music (disambiguation). Music of United States of America Timeline General topics Education · History G …
2Population inversion — In physics, specifically statistical mechanics, a population inversion occurs when a system (such as a group of atoms or molecules) exists in state with more members in an excited state than in lower energy states. The concept is of fundamental… …
3The Irish (in Countries Other Than Ireland) — The Irish (in countries other than Ireland) † Catholic Encyclopedia ► The Irish (in countries other than Ireland) I. IN THE UNITED STATES Who were the first Irish to land on the American continent and the time of their arrival are …
4United States — a republic in the N Western Hemisphere comprising 48 conterminous states, the District of Columbia, and Alaska in North America, and Hawaii in the N Pacific. 267,954,767; conterminous United States, 3,022,387 sq. mi. (7,827,982 sq. km); with… …
5UNITED STATES OF AMERICA — UNITED STATES OF AMERICA, country in N. America. This article is arranged according to the following outline: introduction Colonial Era, 1654–1776 Early National Period, 1776–1820 German Jewish Period, 1820–1880 East European Jewish Period,… …
6United States presidential election, 2008 — 2004 ← November 4, 2008 → 2012 …
7United States Declaration of Independence — Declaration of Independence redirects here. For the type of document generally, see Declaration of independence. For the painting, see Trumbull s Declaration of Independence. United States Declaration of Independence …
8radiation — radiational, adj. /ray dee ay sheuhn/, n. 1. Physics. a. the process in which energy is emitted as particles or waves. b. the complete process in which energy is emitted by one body, transmitted through an intervening medium or space, and… …
9nuclear fission — fission (def. 2). [1885 90] * * * Division of a heavy atomic nucleus into two fragments of roughly equal mass, accompanied by the release of a large amount of energy, the binding energy of the subatomic particles. The energy released in the… …
10relaxation phenomenon — ▪ physics and chemistry Introduction in physics and chemistry, an effect related to the delay between the application of an external stress to a system that is, to an aggregation of matter and its response. It may occur in nuclear, atomic,… …
