Fluorine • Halogen

Primary XPS region: F1s
Overlapping regions: Cu LMM
Binding energies of common chemical states:

Chemical stateBinding energy F1s
Metal fluorides684-685.5 eV
Organic fluorine688-689 eV

 

Experimental information

  • For fluoropolymers which may be sensitive to prolonged X-ray exposure, acquire C1s and F1s regions first before moving onto survey and/or other elemental regions.

 

Interpretation of XPS spectra

  • Should see F KLL Auger peak as (binding energy=832eV and 858eV) confirmatory signal, except for very low concentrations.
  • F1s peak shapes are normally symmetrical.
  • Fluorine tends to induce large chemical shifts in other elements, but within a given class of fluorine compounds (metal fluoride or organic fluorine), the shifts in the F1s peak are small.
    • The chemical shift between CF2 and CF3 is large (3eV) in the C1s region, for example, but the shift in the F1s region for the same chemical groups is negligible.

 

General comments

  • Organic fluorine species are commonly observed surface contaminants.

 

Element Crystal cub

About this element

Symbol: F
Date of discovery: 1886
Name origin: Latin fluo
Appearance: greenish
Discoverer: Joseph Henri Moissan
Obtained from: mineral fluorite

Melting point: 53.53 K
Boiling point: 85.01 K
Density[kg/m3]: 1.696
Molar volume: 11.20 x 10-6 m3/mol
Protons/Electrons: 9
Neutrons: 10
Shell structure: 2,7
Electron configuration: [He]2s22p5
Oxidation state: -1
Crystal structure: cubic

G. Agricola first described fluorine in the form of fluorspar (calcium fluoride) in 1529, but because of its highly reactive nature, it took until 1886 for fluorine to be isolated by H. Moissan. This feat earned Moissan the Nobel Prize in Chemistry in 1906. Commercial production of fluorine was not needed until the Manhattan Project, in which uranium hexafluoride was used to separate the isotopes U-235 and U-238. Today, fluorine is found in such materials as Teflon and Freon. Fluorine is the most reactive and electronegative of all elements, and in the presence of water, will form hydrofluoric acid, an extremely dangerous compound.

 

Fluorine • Halogen

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