Doublet Separations #

As 3d = 0.7 eV

As 3p = 4.8 eV

As 2p = 35.8 eV

Common Overlaps for As 3d #

V 3p – Hf 4f – Ce 5s – Pr 5s – Sr 4s – Pm 5s – Nd 5s – Sm 5s – At 5d – Te 4d – At 5d – Th 6p – Cr 3p – Ru 4p – Ca 3s

Auger Energies #

Note – these are listed in KINETIC ENERGY

As LMM ≈ 1225 eV

Common Binding Energies – As 3d #

Theory and Background #

Arsenic is primarily analysed using the As(3d) region, which can overlap with the Ta(5p_1/2) signal.  Generally observed as an oxide or in GaAs, the As(3d) region has a spin-orbit splitting of 0.7 eV, with an intensity ratio of 0.7, as opposed to the expected 0.67.

Recording the As(2p_3/2) region is useful also and demonstrates oxide thickness as a function of kinetic energy (see below)

Experimental Advice #

It has been reported that As₂O₃ sublimes in vacuum [1], whereas As⁵⁺ may under go some degredation by XPS analysis to yield As³⁺, so rapid analysis and/or summation of multi-point analysis may be required.

The As LMM Auger peaks when recorded with a Al source encompass a wide energy range (500 – 250 eV) and therefore overlap with many other photoemission lines, so care should be taken in analysis.

Data Analysis Guidance #

N/A

Reference Datasets #

Coming soon

References #