Carbon (C) X-ray absorption edges

The C $K$ edge is at 284.2 $eV$ . The tables list 4 absorption edges for carbon; only $K$ lies between 100 $eV$ and 100 $keV$ , the range the lab can scan.

Atomic number: $Z = 6$
Molar mass: 12.011 $g / mol$
Edges in the lab range: 1 of 4

Open carbon in the lab

Both load carbon as a pure sample with the formula $C$ . 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 carbon

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
$K$	284.2	19.02	0.0014	ScanSoft X-ray
$L_{1}$	18	1	0	Outside range
$L_{2}$	7.2	1	0	Outside range
$L_{3}$	7.2	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.

Sample presets containing carbon

Carbon monoxide gas $CO$ , 0.001145 $g / cm^{3}$ , opens at the C $K$ edge

These links load the preset's density and select carbon as the absorber. Check the density source on the Sample page and adjust it for your sample.

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