Description

The neutron scattering length density is defined as

SLD = (b_c1 +b_c2+...+b_cn )/Vm

where

b_ci is the bound coherent scattering length of ith of n atoms in a molecule with the molecular volume Vm

How to Format the Compound Name

To calculate scattering length densities enter a compound and a mass density and click "Calculate". Entering a wavelength value is optional (a default value of 6.0 Angstroms will be used).

• Formula strings consist of counts and atoms such as "CaCO3+6H2O".
• Groups can be separated by '+' or space, so "CaCO3 6H2O" works as well.
• Groups and be defined using parentheses, such as "CaCO3(H2O)6".
• Parentheses can be nested, such as "(CaCO3(H2O)6)1".
• Isotopes are represented by their index, e.g., "CaCO[18]3+6H2O", H[1], or

H[2].

• Counts can be integer or decimal, e.g. "CaCO3+(3HO0.5)2".
• Other compositions can be calculated as well, for example, for a 70-30

mixture of H2O/D2O write H14O7+ D6O3 or more simply H7D3O5 (i.e. this says 7 hydrogens, 3 deuteriums, and 5 oxygens) and the mass density calculated based on the percentages of H and D.

• Type C[13]6 H[2]12 O[18]6 for C(13)6H(2)12O(18)6 (6 Carbon-13 atoms, 12

deuterium atoms, and 6 Oxygen-18 atoms)