Calibration method at the N K-edge using interstitial nitrogen gas in solid-state nitrogen-containing inorganic compounds

摘要

The standard method of soft X-ray beamline calibration at the N K-edge uses the ν = 0 peak transition of gas-phase N2. Interstitial N2 gas trapped or formed within widely available solid-state ammonium- and amine-containing salts can be used for this purpose, bypassing gas-phase measurements. Evidence from non-nitrogen-containing compounds (KH2PO4) and from He-purged ammonium salts suggest that production of N2 gas is through beam-induced decomposition. Compounds with nitrate or nitrite as anions produce coincident features and are not suitable for this calibration method.