Photoemission and boron K‐edge spectra from solid diborane on silver or graphite surfaces were measured before and after exposure to synchrotron radiation at 78 K. Exposing condensed diborane on a silver support to synchrotron radiation produced a boron‐rich film that was retained on the surface at 300 K. A surface phase whose valence and near‐edge spectra resembled o‐carborane was created by a photon or photoelectron‐induced reaction between graphite and diborane.

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