The NO-Ar van der Waals complex has been generated in the molecular beam. The complex in the
E2Σ+ state has been studied by using the resonance enhanced multiphoton ionization technique with a time-of-flight mass spectrometer. Two sort of excitations spectra have been measured; one is the
E2Σ+-
X2II excitation spectrum and the other is the
E2Σ+ -
A2Σ+ excitation spectrum. The 0-0 band of the complex is red-shifted by 496.8 cm
-1- from that of bare NO. The binding energy of NO (
E2Σ+)-Ar is determined to be 585 cm
-1 and the progression due to the stretching van der Waals mode measured is extremely complex. The results are compared with those obtained for NO (
A2Σ+)-Ar and NO
+ (
X1Σ+)-Ar complexes.
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