Rubidium (Rb) X-ray absorption edges

The Rb $K$ edge is at 15,200 $eV$ . The tables list 12 absorption edges for rubidium; $K$ , $L_{1}$ , $L_{2}$ , $L_{3}$ , $M_{1}$ , $M_{2}$ , $M_{3}$ , $M_{4}$ and $M_{5}$ lie between 100 $eV$ and 100 $keV$ , the range the lab can scan.

Atomic number: $Z = 37$
Molar mass: 85.4678 $g / mol$
Edges in the lab range: 9 of 12

Open rubidium in the lab

Both load rubidium as a pure sample with the formula $Rb$ . 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. To scan another edge, use the links in the table below.

Absorption edges of rubidium

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
$K$	15,200	6.97	0.64319	ScanHard X-ray
$L_{1}$	2,065	1.14076	0.0046	ScanHard X-ray
$L_{2}$	1,864	1.4	0.022	ScanSoft X-ray
$L_{3}$	1,804	3.987	0.024	ScanSoft X-ray
$M_{1}$	326.7	1.04	0.00005425	ScanSoft X-ray
$M_{2}$	248.7	1.058	0.0000485	ScanSoft X-ray
$M_{3}$	239.1	1.1232	0.0000825	ScanSoft X-ray
$M_{4}$	113	1.953	0.0027	ScanSoft X-ray
$M_{5}$	112	1.843	0	ScanSoft X-ray
$N_{1}$	30.5	1	0.000011684	Outside range
$N_{2}$	16.3	1	0.012658	Outside range
$N_{3}$	15.3	1	0.012658	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

$K$ and $L_{1}$ are hard X-ray edges in the lab's classification (2 $keV$ and above). The sample planner suggests transmission when the edge step is large enough relative to total attenuation. For a small step, as in a dilute absorber, it suggests fluorescence. Concentration alone does not decide the measurement mode.

$L_{2}$ , $L_{3}$ , $M_{1}$ , $M_{2}$ , $M_{3}$ , $M_{4}$ and $M_{5}$ are soft X-ray edges 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 $L_{2}$ , $L_{3}$ , $M_{1}$ , $M_{2}$ , $M_{3}$ , $M_{4}$ and $M_{5}$ 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