REMPI detection of singlet oxygen O-1(2) arising from UV-photodissociation of van der Waals complex isoprene-oxygen C5H8-O-2

摘要

The one-laser two-color resonance enhanced multiphoton ionization REMPI [(1 + 1') + 1] and velocity map imaging have been applied to investigate formation of molecular oxygen in excited singlet O-2(a(1)Delta(g)) and ground O-2(X-3 Sigma(-)(g)) states in the photodissociation of van der Waals complex isopreneoxygen C5H8-O-2. These molecules were found to appear in the different rotational states with translational energy varied from a value as low as similar to 1 meV to a distribution with temperature of about 940 K. The observed traces of electron recoil in the images of photoions reveal participation of several ionization pathways of the resonantly excited intermediate states of O-2. (C) 2017 Elsevier B.V. All rights reserved.