Nitrogen monofluoride (fluoroimidogen) is a metastable species that has been observed in laser studies.

Like boron monofluoride, it is an instance of the rare multiply-bonded fluorine atom.

[1][2] It is unstable with respect to its formal dimer, dinitrogen difluoride, as well as to its elements, nitrogen and fluorine.

Stoichiometrically, the reaction is extremely efficient, regenerating a radical for long-lasting chain propagation.

Azide decomposition offers a less-efficient but more pure technique: fluorine azide (which can be formed in situ via reaction of atomic fluorine with hydrazoic acid) decomposes upon shock into NF and N2.