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Berlin 2001 – wissenschaftliches Programm

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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.

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