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Item _atom_site.U_equiv_geom_mean


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Description


              Equivalent isotropic atomic displacement parameter, U~equiv~,
               in angstroms squared, calculated as the geometric mean of
               the anisotropic atomic displacement parameters.

               U~equiv~ = (U~i~ U~j~ U~k~)^1/3^

               U~n~ = the principal components of the orthogonalised U~ij~

Category

atom_site

Mandatory Code

no

Data Type Code

float

Units

angstroms_squared

Enumeration Range

Minimum Value Maximum Value
10.0 10.0
0.0 10.0
0.0 0.0

Alias Names

Alias Name Dictionary Version
_atom_site_U_equiv_geom_mean cif_core.dic 2.0.1

Related Items

Related Item Related Function
_atom_site.U_equiv_geom_mean_esd associated_esd
_atom_site.B_equiv_geom_mean conversion_constant

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