Collision-energy resolved steric effect on the Penning ionization reaction of tert-butyl bromide and Kr(3P)

Collision energy dependence of the Penning ionization cross-section for the Kr(3P) + (CH3)3CBr → Kr + (CH3)3CBr+ + 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.