Spectroscopy and energy disposal dynamics of phthalocyanine–Arn (n=1,2) complexes generated by hyperthermal pulsed nozzle source

A hyperthermal pulsed nozzle was developed to study the structure, energetics and dynamics of phthalocyanine–Arn (n=1, 2). The analysis of vibronic features revealed that the Ar atoms bind over the center of the phthalocyanine ring in both complexes. Despite little changes in energetics, the Ar complexation resulted in a significantly lower threshold energy for intramolecular vibrational redistribution in the 1:1 complex (∼474.2 cm−1) than in bare phthalocyanine (∼720 cm−1). Vibrational predissociation also starts at a somewhat higher energy (∼676.4 cm−1). The upper limits of intermolecular dissociation energy in the ground and excited states were 661.3 cm−1 and 676.4 cm−1, respectively.