Moseley's law

Moseley's law (after Henry Moseley ) describes the situation of the so-called line in the X-ray spectrum (which is that line which corresponds to the transition of an electron from the L shell to the K shell ).

In a more general form can be determined with this Law and the wavelengths of the remaining lines of the X-ray spectrum; the wavelength of the emitted or absorbed electron transfer characteristic X-rays is dependent on the ordinal number of the respective element, and thus characteristic of a particular element:

Where:

• - Belonging to the wavelength frequency
• - The vacuum speed of light
• - The appropriate Rydberg frequency   - Rydberg
• - Rydberg constant
• - Electron mass
• - Nuclear mass

• - Atomic number of the element
• - Shielding constant ( shielding of the nuclear charge by electrons, which are located between the core and the observed electron)

For the transition of an electron from the second shell ( L shell ) in the first shell ( K-shell ), the so-called transition, applies, and the corresponding wave number is then Moseley's law for the line: