unoccupied state
41Fermi energy — The Fermi energy is a concept in quantum mechanics usually referring to the energy of the highest occupied quantum state in a system of fermions at absolute zero temperature. This article requires a basic knowledge of quantum mechanics.Note that… …
42Dirac equation — Quantum field theory (Feynman diagram) …
43History of Lithuanian culture — The culture of Lithuania has existed for thousands of years, dating back to 200 B.C., with the settlement of the Balts and has been independent of the presence of a sovereign Lithuanian state. [History Culture of Lithuania… …
44Spotted Owl — northern race plumage Conservation status …
45Metapopulation — A metapopulation consists of a group of spatially separated populations of the same species which interact at some level. The term metapopulation was coined by Richard Levins in 1970 to describe a model of population dynamics of insect pests in… …
46Durrus and District History 1700-1900 — Durrus is an area of West Cork in Ireland. For earlier history, see Durrus and District History. For later history, see Durrus and District History Modern. Contents 1 1700 1800 1.1 Indictment of Priests 1714 2 Irish Famine of 1740 41 …
47Wannsee Conference — The HolocaustThe Wannsee Conference was a meeting of senior officials of the Nazi German regime, held in the Berlin suburb of Wannsee on 20 January 1942. The purpose of the conference was to inform heads of Departments responsible for various… …
48spectroscopy — spectroscopist /spek tros keuh pist/, n. /spek tros keuh pee, spek treuh skoh pee/, n. the science that deals with the use of the spectroscope and with spectrum analysis. [1865 70; SPECTRO + SCOPY] * * * Branch of analysis devoted to identifying… …
49United 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… …
50Western Australia — Western Australian. a state in W Australia. 1,273,624; 975,920 sq. mi. (2,527,635 sq. km). Cap.: Perth. * * * State (pop., 2001: 1,906,114), western Australia. Covering 976,790 sq mi (2,529,880 sq km), it constitutes one third of the continent s… …
