Osnabrück 2002 – wissenschaftliches Programm

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A: Atomphysik

A 13: Photoionisation II (gemeinsam mit FV Molekülphysik)

A 13.6: Vortrag

Donnerstag, 7. März 2002, 15:15–15:30, HS 15/E10

The complete description of the 4σ⁻¹ inner valence photoionization of NO derived from photoelectron and photoion angular distributions — •Oliver Gessner¹, Yasumasa Hikosaka², Björn Zimmermann¹, Andreas Hempelmann¹, John Eland², Paul-Marie Guyon³, and Uwe Becker¹ — ¹Fritz-Haber-Institut der MPG, Faradayweg 4-6,14195 Berlin, Germany — ²Physical and Theoretical Chemistry Laboratory, South Parks Road, Oxford OX1 3QZ, UK — ³Laboratoire des Collisions Atomiques et Moléculaires, Université Paris Sud, 91405 Orsay, France

We measured molecular frame angular distributions of NO 4σ⁻¹ photoelectrons and photoions after excitation with linearly and circularly polarized light at hν=40.8 eV. The angular correlations of the emitted electrons and ions were analyzed using a new fitting procedure which takes into account all experimental angular resolution effects. For the first time a complete description of the valence photoionization of a heteronuclear molecule was derived from photoelectron and photoion angular distributions. The combination of measurements with linearly and circularly polarized light leads to a unique set of dipole matrix elements and phase differences describing the 4σ⁻¹ inner valence photoioinization of NO. All σ−σ and σ−π dipole transition parameters were simultaneously derived without any additional input from ab initio model calculations. The reliability of the method is estimated using standard fit analysis functions supplying future molecular structure calculations such as RPA and LDA with quantitative benchmarks.