Conformation-selective excitation of Rydberg states in iodocyclohexane and vibration-specific predissociation dynamics investigation

Highlights: • Iodocyclohexane was conformation selective excited with tunable VUV fs pulse. • Vibration-specific predissociation dynamics of Rydberg states in axial-c-C₆H₁₁I was studied. • The lifetimes of different Rydberg states were measured to be < 1 ps. • Multidimensional nature of the predissociation dynamics was discussed. The predissociation-mediated excited state decays for several vibronic levels of the B and C Rydberg states of axial-iodocyclohexane (axial-c-C₆H₁₁I) are investigated with time-resolved mass spectrometry. The B or C state of axial-c-C₆H₁₁I was selectively excited with tunable VUV femtosecond laser at wavelengths of 204.2 nm-201.5 nm. The following predissociation decay via the crossing between the Rydberg states and the repulsive A-band was observed and the lifetimes were measured to be < 1 ps for different vibronic levels. The vibronic dependence of the B and C states lifetimes is discussed, which provides further evidence of the multidimensional nature of the predissociation in these states.