• Material: (enter chemical formula).
• Density gm/cm^3 (enter negative value to use tabulated densities.)
• Gap/Period ratio: .
• Grating bar thickness: nm.
• Fractional grating area: .
• Support mesh thickness: microns.
• Diffraction Order: .
• Photon energy range from eV to eV in points (< 500).

  (NOTE: Energies must be in the range 30 eV < E < 30,000 eV).

To reset to default values, press this button: .

Grating Efficiency

The fraction of the incident radiation which is diffracted into a single specified order (positive and negative orders treated separately) as calculated by the scalar diffraction theory.

Material

The chemical formula is required here. Note that this is case sensitive (e.g. CO for Carbon Monoxide vs Co for Cobalt).

Density

If a negative value is entered, the chemical formula is checked against a list of some common materials. If no match is found then the density of the first element in the formula is used.

Gap/Period

Ratio of the gap between the rectangular grating bars to the grating period.

Fractional grating area

The fraction of the grating area which is not obscurred by the support structure (=1 if no support mesh).

Support mesh thickness

The thickness of the support mesh only effects the zero order efficiency.

Output

A GIF plot may be generated for quick viewing of the results. If you need anything fancier, the results are provided as a text file for use with your favorite plotting package.