# Atomic percent

Atomic percent

Atomic percent or at.% is a measure of concentration of dopant, used in chemistry, physics of solid state lasers and spectroscopy.The meaning of this term strongly depends on the context, host material and dopant. In particular, atomic percent may refer to:

(A) Molar fraction [http://en.wikipedia.org/w/index.php?title=Concentration#Table_of_concentration_measures] [http://www.semicontimes.com/common/glossary.asp?termid=61] ,which is ratio $~ m~ frac\left\{number~of~atoms~of~dopant\right\}\left\{number~of~ atoms~ of~ solution\right\}$

(B) The molar (or atomic) percentage [http://www.rp-photonics.com/doping_concentration.html] refers to the ratio
$~ m frac\left\{number~ of~ atoms~ of~ dopant\right\}\left\{number~of~ atoms~ of~ solution,~ which~ can~ be~ substituted~ with~ the~ dopant\right\}~$.

For example, according to the definition (B), 100% doped $m Yb: Y_3!~Al_5!~O_\left\{12\right\}$ is just$m Yb_3!~Al_5!~O_\left\{12\right\}$, not pure Yb, as it would be in the case of definition (A).Definition (B) is widely used in laser physics, and the ambiguity of the term"atomic percent" may cause confusions.

Atomic percent is also used in applications involving atomic isotopes, such as nuclear engineering. In this context, the atomic percent refers to the ratio of the number of atoms of a particular isotope to the total number of atoms in the sample.

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### См. также в других словарях:

• Atomic percent — Atomic percent. См. Атомный процент. (Источник: «Металлы и сплавы. Справочник.» Под редакцией Ю.П. Солнцева; НПО Профессионал , НПО Мир и семья ; Санкт Петербург, 2003 г.) …   Словарь металлургических терминов

• atomic percent — atominis procentas statusas T sritis fizika atitikmenys: angl. atom percent; atomic percent vok. Atomprozent, n rus. атомный процент, m pranc. pour cent atomique, m …   Fizikos terminų žodynas

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• atomic number 7 — noun a common nonmetallic element that is normally a colorless odorless tasteless inert diatomic gas; constitutes 78 percent of the atmosphere by volume; a constituent of all living tissues • Syn: ↑nitrogen, ↑N • Derivationally related forms:… …   Useful english dictionary

• atomic number 8 — noun a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth s crust • Syn: ↑oxygen, ↑O • Derivationally… …   Useful english dictionary

• atom percent — atominis procentas statusas T sritis fizika atitikmenys: angl. atom percent; atomic percent vok. Atomprozent, n rus. атомный процент, m pranc. pour cent atomique, m …   Fizikos terminų žodynas

• Oil, Chemical and Atomic Workers International Union — OCAW Full name Oil, Chemical and Atomic Workers International Union Founded 1918 Date dissolved January 4, 1999 Merged into Paper, Allied Industri …   Wikipedia

• Атомный процент — Atomic percent Атомный процент. Число атомов элементов от всего 100 % состава вещества. (Источник: «Металлы и сплавы. Справочник.» Под редакцией Ю.П. Солнцева; НПО Профессионал , НПО Мир и семья ; Санкт Петербург, 2003 г.) …   Словарь металлургических терминов

• AT% — Atomic Percent (Academic & Science » Chemistry) …   Abbreviations dictionary

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