Magnesium (Mg) X-ray absorption edges

The Mg $K$ edge is at 1,303 $eV$ . The tables list 7 absorption edges for magnesium; only $K$ lies between 100 $eV$ and 100 $keV$ , the range the lab can scan.

Atomic number: $Z = 12$
Molar mass: 24.305 $g / mol$
Edges in the lab range: 1 of 7

Open magnesium in the lab

Both load magnesium as a pure sample with the formula $Mg$ . Density is retained from your current settings because these X-ray tables have no density. Enter your sample's density on the Sample page before planning a thickness.

Absorption edges of magnesium

Energies, jump ratios and fluorescence yields as tabulated by Elam, Ravel and Sieber (2002). Scroll within the table to see every column.
Edge	Energy ( $eV$ )	Jump ratio	Fluorescence yield	In the lab
$K$	1,303	12.02	0.025675	ScanSoft X-ray
$L_{1}$	88.6	1	0.00002	Outside range
$L_{2}$	49.6	1	0.0012	Outside range
$L_{3}$	49.21	1	$1.2 \times 1 0^{- 13}$	Outside range
$M_{1}$	2	1	0.00000504	Outside range
$M_{2}$	1	1	0	Outside range
$M_{3}$	1	1	0	Outside range

Jump ratio is the photoabsorption just above the edge divided by the photoabsorption just below it. Fluorescence yield is the probability that a core hole in that shell decays by emitting an X-ray. Both are dimensionless. The lab can scan across edges strictly between 100 $eV$ and 100 $keV$ ; other edges are listed for reference. A listed edge with jump ratio 1 has no step for thickness planning.

Transmission, fluorescence or electron yield

$K$ is a soft X-ray edge in the lab's classification (below 2 $keV$ ). Transmission generally needs thin films or membranes, so the planner suggests fluorescence or electron yield. The fluorescence yield at $K$ is below 0.05, where the lab suggests considering total electron yield.

These are planning rules of thumb. Sample thickness, self-absorption and the beamline's energy range and detectors still matter. The lab simulates transmission; it does not simulate fluorescence or electron-yield detector counts.

Values from XrayDB 9.2 (Elam, Ravel and Sieber, 2002), released into the public domain. These isolated-atom tables do not include chemical shifts, XANES or EXAFS fine structure. Methods and data sources