We have investigated the photoionization of ammonia borane (AB) and determined adiabatic ionization energy to be 9.26±0.03 eV for the X+ 2 E←X 1 A1 transition. Although the threshold photoelectron spectrum appears at first glance to be similar to the one of the isosteric ethane, the electronic situation differs markedly, due to different orbital energies. In addition, an appearance energy AE0K (NH3 BH3 , NH3 BH2 + )= 10.00±0.03 eV has been determined, corresponding to the loss of a hydrogen atom at the BH3 -site. From the data, a 0 K bond dissociation energy for the B-H bond in the cation of 71.5±3 kJ mol-1 was derived, whereas the one in the neutral compound has been estimated to be 419±10 kJ mol-1 .

Institute of Physical and Theoretical Chemistry University of Würzburg Am Hubland 97074 Würzburg Germany

Laboratory for Synchrotron Radiation and Femtochemistry Paul Scherrer Institut 5232 Villigen Switzerland

Present address Department of Dynamics of Molecules and Clusters J Heyrovský Institute of Physical Chemistry Dolejškova 2155 3 182 23 Praha 8 Czech Republic

Present Address Laboratory for Astrophysics Leiden Observatory Leiden University 2300 RA Leiden (The Netherlands

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