`BRAGGS' EQUATION` allows a number of different simple uses of
Braggs' equation. From known angles
and wavelength (or energy), the corresponding d-spacings may be calculated
using the `D-SPACING`
sub-menu option. From known d-spacings and
wavelength the corresponding angles may be calculated using
the `TWO THETA ANGLE`
option.
From known d-spacings and angles
the wavelength (and photon energy) may be calculated using
`WAVELENGTH/ENERGY`
.
The commands `EXIT` or `QUIT` can be used to return to the main menu.

Here is an example of use, which converts a angle at one wavelength into the equivalent diffraction peak angle at a different wavelength:

Main menu: ENTER COMMAND [INPUT DATA]:bragg Bragg equation sub-menu: ENTER COMMAND [D-SPACING]: WAVELENGTH (Angstroms) (0.0 for keV ) (Range: 0.0 to 1.000E+05) [1.54061]: INFO: Energy = 8.047779 keV TWO THETA ANGLE (Degrees) (Range: 0.0 to 180.000) [20.0000]:69.79 INFO: D-spacing (Angstroms) = 1.34652 Bragg equation sub-menu: ENTER COMMAND [TWO THETA ANGLE]: WAVELENGTH (Angstroms) (0.0 for keV ) (Range: 0.0 to 1.000E+05) [1.54061]:0. ENERGY OF RADIATION (keV) (Range: 1.000E-03 to 10000.0) [8.04778]:16.5 INFO: Wavelength = .7514255 Angstroms D-SPACING (Angstroms) (Range: 1.000E-03 to 1.000E+06) [1.34652]: INFO: Two theta angle (Degrees) = 32.40415 Bragg equation sub-menu: ENTER COMMAND [D-SPACING]:exit

2004-01-09