DALTON

DALTON (named after John Dalton) is a quantum chemistry program. It is capable of calculating various molecular properties using the Hartree-Fock, MP2, MCSCF and coupled cluster theories. Version 2.0 of DALTON plans to add support for density functional theory calculations. == External link == *[http://www.kjemi.uio.no/software/dalton/dalton.html DALTON Homepage] Computational chemistry software

Dalton

===Unit of mass=== The dalton (symbol Da) is the immediate predecessor of the atomic mass unit. It is named after John Dalton in recognition of his achievement in introducing the atom into chemistry. Whereas the unified atomic mass unit is defined as 1/12 of the mass of a single atom of carbon, the dalton was defined as 1/16 of the mass of an atom of oxygen (which turned out to be a mixture of ¹⁶O, ¹⁷O and ¹⁸O in a 3150:1:5 ratio with mean atomic mass number of 16,0035). ===Placename=== Dalton is also a placename in the United Kingdom: *Dalton, Dumfries and Galloway, Scotland *Dalton, Lancashire, England *Dalton, Hexham, Northumberland, England *Dalton, Ponteland, Northumberland, England *Dalton, Sowerby, North Yorkshire, England *Dalton, Richmond, North Yorkshire, England *Dalton, South Yorkshire, England Also: Dalton in Furness, Cumbria, England Dalton is also a placename in the United States: *Dalton, Georgia *Dalton, Massachusetts *Dalton, Minnesota *Dalton, Missouri *Dalton, Nebraska *Dalton, New Hampshire *Dalton, New York *Dalton, Ohio *Dalton, Pennsylvania *The Dalton Trail is an old Tlingit trail, whereas the Dalton Highway is a road through Alaska. ===Surname=== Notable people whose surname is or was Dalton (with entries in Wikipedia): *Emmett Dalton (1861-1937), U.S. outlaw, member of the Dalton Gang *Hugh Dalton, Baron Dalton, Baron Dalton (1887-1962), British politician *John Dalton (1766-1844), British physicist and chemist *John M. Dalton (1900-1972), U.S. politician *John N. Dalton (1931-1986), U.S. politician *Jon Dalton, U.S. wrestler ("Jonny Fairplay") *Richard Dalton (born 1979), Canadian canoeist *Rick Dalton, Canadian politician *Timothy Dalton (born 1946), Welsh actor *Tristram Dalton (1738-1817), U.S. politician *Walter H. Dalton, U.S. politician ===Other uses=== *Dalton's law of partial pressure, named after John Dalton *DALTON, a computer program in quantum chemistry, named after John Dalton *The Dalton Plan, an educational concept *The Dalton School, a private school in New York City, New York *The Dalton Gang, an infamous outlaw group in the old West *The Daltons (Lucky Luke), fictional cousins of the Dalton Gang in the Lucky Luke comic books *Dalton (Chrono Trigger), a pirate/general of the Zeal kingdom in the game Chrono Trigger. Units of mass

Dalton

People bearing that surname. People by surname

Dalton

I'm a little puzzled. In one place (http://en.wikipedia.org/wiki/Dalton#Unit_of_mass), the Dalton is defined thus: Whereas the unified atomic mass unit is defined as 1/12 of the mass of a single atom of 12C, the dalton was defined as 1/16 of the mass of an atom of oxygen (which turned out to be a mixture of 16O, 17O and 18O in a 3150:1:5 ratio with mean atomic mass number of 16,0035). But in another place (http://en.wikipedia.org/wiki/Atomic_mass_unit) it is defined thus: The atomic mass unit (amu), unified atomic mass unit (u), or dalton (Da), is a small unit of mass used to express atomic masses and molecular masses. It is defined to be 1/12 of the mass of one atom of Carbon-12. Which is correct? :They're really both right. Dalton used the hydrogen molecule (H2) as his unit, and later (by 1900 or so) the two "competing" systems were H = 1 and O = 16. In part because of the oxygen isotope mix, the switch to C = 12 occurred in 1961. :The 1913 Webster says � Microcrith (Chem.): The weight of the half hydrogen molecule, or of the hydrogen atom, at one time taken as the standard in comparing the atomic weights of the elements; thus, an atom of oxygen weighs sixteen microcriths. This unit is no longer used, and has been replaced by the dalton, which is of approximately the same value. See molecular weight and Crith. --J. P. Cooke. [1913 Webster +PJC] � :The SI document simply states that the (C-12) amu is called the Dalton in the biochemistry domain. Ascribing the dalton to O-16 seems apocryphal. : According to the International Union of Pure and Applied Chemistry (IUPAC) [http://www.chem.qmul.ac.uk/iupac/bibliog/gold.html Compendium of Chemical Terminology], the dalton is a � Non-SI unit of mass (symbol Da), equal to the unified atomic mass unit (atomic mass constant). It is often used in biochemistry and molecular biology although it was never approved by the Conf�rence g�n�rale des poids et mesures. G. B. 111; 1996, 68, 968 IUPAC Compendium of Chemical Terminology � (emphasis added). :User:Urhixidur 05:15, 2005 Feb 5 (UTC)

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D

DA | DB | DC | DE | DF | DG | DH | DI | DJ | DK | DL | DM | DN | DO | DP | DR | DS | DT | DU | DW | DX | DY | DZ |

Words begining with Dalton:

DALTON
Dalton
Dalton
Dalton
Dalton's_law
Dalton's_law_of_partial_pressure
Dalton,_GA
Dalton,_Georgia
Dalton,_MA
Dalton,_Massachusetts
Dalton,_Minnesota
Dalton,_Missouri
Dalton,_MN
Dalton,_MO
Dalton,_NE
Dalton,_Nebraska
Dalton,_New_Hampshire
Dalton,_New_South_Wales
Dalton,_NH
Dalton,_OH
Dalton,_Ohio
Dalton,_PA
Dalton,_Pennsylvania
Dalton-in-Furness
Dalton-in-Furness
Dalton-le-Dale
Daltonganj
Daltonism
Daltons_Law_Of_Partial_Pressure
Dalton_(Chrono_Trigger)
Dalton_(Chrono_Trigger)
Dalton_(crater)
Dalton_(MA)
Dalton_Camp
Dalton_City
Dalton_City,_IL
Dalton_City,_Illinois
Dalton_Conley
Dalton_Gang
Dalton_Gang
Dalton_gang
Dalton_Gardens
Dalton_Gardens,_ID
Dalton_Gardens,_Idaho
Dalton_Highway
Dalton_in_Furness
Dalton_McCarthy
Dalton_McGuinty
Dalton_McGuinty
Dalton_McGuinty,_Sr.
Dalton_McGuinty_Sr.
Dalton_Minimum
Dalton_minimum
Dalton_Piercy
Dalton_Plan
Dalton_Plan
Dalton_railway_station
Dalton_Township,_MI
Dalton_Township,_Michigan
Dalton_Trail
Dalton_Trumbo