A database of chemical/physical properties is included in the I.S.A.A.C.S. program, this webpage presents these properties (atomic radii, x-ray and neutron scattering lengths) as well as the references of the articles from which this information was obtained.

Atomic radii
Covalent-radius
Figure 1:Covalent radii used in I.S.A.A.C.S.

Figure [Fig. 1] illustrates the covalent radii used in I.S.A.A.C.S. see [a] for details.

 

a
Beatriz Cordero and Al. in "Covalent radii revisited"
Dalton Trans.: 2832 - 2838 (2008). [DOI: 10.1039/b801115j]
Ionic-radius
Figure 2:Ionic radii used in I.S.A.A.C.S.

Figure [Fig. 2] illustrates the ionic radii used in I.S.A.A.C.S. see [b] for details.

 

b
Slater J.C.
J. Chem. Phys., 41(10):3199 (1964).

VDW-radius
Figure 3:Van Der Waals radii used in I.S.A.A.C.S.

Figure [Fig. 3] illustrates the Van Der Waals radii used in I.S.A.A.C.S. see [c] for details.

 

c
Bondi A.
J. Phys. Chem., 68(3):441 (1964).

Radius-in-crystal
Figure 4:Shannon radii in crystals used in I.S.A.A.C.S.

Figure [Fig. 4] illustrates the atomic radii in crystals compiled by Shannon used in I.S.A.A.C.S. see [d,e] for details.

 

d
Shannon R.D. and Prewitt C.T.
Acta Cryst., B25:925 (1969).
e
Shannon R.D.
Acta Cryst., A23:751-76A (1976).

Neutron scattering lenghts
Neutron-scattering
Figure 5:Neutron scattering lengths used in I.S.A.A.C.S.

Figure [Fig. 5] illustrates the neutron scattering lengths used in I.S.A.A.C.S. see [f, g] for details. The atomic numbers are used for the x-ray scattering lengths.

 

f
http://www.ncnr.nist.gov/resources/n-lengths/
g
Sears, Varley F.
Neutron News, 3(3):26-37 (1992).

Notes:

Please notice that the user may override the atomic radii as well as the scattering lenghts suggested by I.S.A.A.C.S. and use his/her own.





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