[en] The x-ray photoemission spectra of Pr, PrHsub(2.1) and PrH₃ have been measured. The core levels of PrH₃ show satellites due to H 1s → Pr 4f transitions, which become weaker in PrHsub(2.1). PrHsub(2.1) exhibits satellites due to Pr 5d → Pr 4f transitions and those due to the empty localised 5d level. Taking these satellite structures into account, chemical shifts between PrHsub(2.1) and PrH₃ are ambiguous while there are large chemical shifts between Pr and PrHsub(2.1), implying that a charge transfer occurs from Pr to tetrahedral hydrogen but not to octahedral hydrogen. A hydrogen-induced band appears at about 6 eV below the Fermi energy, and comparison with theoretical densities of states suggests the importance of hybridisation between Pr 6sp and H 1s in the metal-hydrogen bonding. (author)