Mass-analysed threshold ionisation (MATI) spectra of the Ar NO complex have
been obtained for the first time. These spectra have been used to determin
e unambiguously the nature of three bands detected by resonance-enhanced mu
ltiphoton ionisation (REMPI) spectroscopy via the A state of Ar NO. The fea
tures are should to originate from vibrationally excited states of Ar . TO
in its electronic ground state. The assignment is in agreement with recent
theoretical calculations. (C) 2001 Elsevier Science B.V. All rights reserve
d.