Extended Data Fig. 2: N1s data at every temperature and pressure.
From: Operando probing of the surface chemistry during the Haber–Bosch process
a–c, 200 mbar 1:3 N2:H2 nitrogen spectra over Fe(110), Fe(210) and \({\rm{Ru}}(10\bar{1}3)\), respectively. d–f, 500 mbar 1:3 N2:H2 nitrogen spectra over Fe(110), Fe(210) and \({\rm{Ru}}(10\bar{1}3)\), respectively. Temperature increases from top to bottom, from 423 K to 723 K.
