Free electron laser IR photodepletion spectroscopy of metal cluster-ligand complexes in a molecular beam is demonstrated on Ag-n(NH3)(m) complexes in the range 800-1150 cm(-1). Where direct comparison can be made, our spectra agree with spectra measured by CO2 laser photodepletion spectroscopy. New vibrational spectroscopic data addressing previously unreachable spectral regions, including results for deuterated ND3 are reported for complexes of Ag-3, Ag-4 and Ag-5. (C) 2002 Published by Elsevier Science B.V.