Scattering Length Density (SLD) Calculator
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
To calculate scattering length densities enter a compound and
a mass density and click "Calculate". Enter a wavelength value is optional and its default
value will be 6.0A.
- 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 nest: "(CaCO3(H2O)6)1".
- Isotopes are represented by index, e.g., "CaCO[18]3+6H2O".
More examples: H[1], H[2].
- Counts can be integer or decimal, e.g. "CaCO3+(3HO0.5)2".
Other compositions can be calculated as well,
for example a 70-30 mixture of H2O/D2O can be written as H14O7+ D6O3
or more simply H7D3O5 <\b>(i.e. 7 hydrogens, 3 deuteriums, and 5 oxygens)
and the mass density calculated based on the percentages of H and D.
Type for example "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)
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