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  We report on the experimental observation of the B+ 2Σ+ state of MgAr+ located below the Mg+(3p 2P3/2) + Ar(1S dissociation asymptote. Using the technique of isolated-core multiphoton Rydberg-dissociation spectroscopy, we have recorded rotationally resolved spectra of the B+ 2Σ+(v' ← X+ 2Σ+(v″ = 7) transitions, which extend from the vibrational ground state (v' =  to the dissociation continuum above the Mg+(3p 2P3/2) + Ar(1S dissociation threshold. The analysis of the rotational structure reveals a transition from Hund's angular-
 
					 
						 
                                     
				    				