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MO: Molekülphysik
MO 8: Posters Thursday: Dissociation and other Collision Processes
MO 8.22: Poster
Donnerstag, 5. April 2001, 12:30–15:00, AT3
Photodissociation of molecular oxygen in the Herzberg continuum — •Nathalie Vaeck, Ahmed Dian, Sophie Fally, and Jacques Liévin — Laboratoire de Chimie Physique Moléculaire, ULB, Belgium
The photodissociation of molecular oxygen by ultraviolet solar radiation is the first step in the ozone-making reaction sequence. In the lower stratosphere 90% of the O2 photodissociation results from transitions from the ground electronic state X3Σg− to the vibrational continua of the A3Σu+, A’3Δu and c1Σu− Herzberg states. Using the new set of spectroscopic constants determined recently by high resolution Fourier Transform Spectroscopy, we have contructed the RKR potentials energy curves for the A, A’ and c Herzberg states. Then we have obtained the vibrational wave functions by solving the Schrödinger equation for the nuclear motion using a B-spline basis set. These vibrational levels are divided into a discrete and a pseudo-continuum part. The later allows the direct calculation of the photodissociation cross-section of the Herzberg continuum. These results are compared with the available experimental data.