Collision energy dependence of the Penning ionization cross-section for the Kr(P-3) + (CH3)(3)CBr --> Kr + (CH3)(3) CBr+ + e(-) reaction was determined under orientation-angle resolved condition using an oriented (CH3)3CBr beam and time-of-flight measurements. A remarkable resonance-type structure was found in the energy dependence of orientation-angle resolved Penning ionization cross-section. This resonance-type structure could be interpreted as a new-type,nuclear-excited Feshbach resonance' in the formation of vibrational excited Rydberg states leading to a competitive dissociative exit channel. (C) 2003 Elsevier B.V. All rights reserved.