Hannover 2010 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 8: Poster: Electronic Spectroscopy

MO 8.11: Poster

Dienstag, 9. März 2010, 16:00–18:30, Lichthof

Investigation of the lifetime vibrational interference during the NO 2σ⁻¹ → 2π (v_r) resonance decay by dispered fluorescence of NO⁺ — •André Knie, Witoslaw Kielich, Philipp Reiss, Philipp Demekhin, and Arno Ehresmann — Institute of Physics and CINSaT, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany

Spectra of dispersed fluorescence from fragments formed after the de-excitation of the 1s⁻¹ π^* resonances of N^*O molecules have been measured by photon induced fluorescence spectroscopy (PIFS) in the spectral ranges from 130 nm to 150 nm (UV) and 425 nm to 470 nm (visible).

The excitation was performed by synchrotron radiation from the UE56/2 PGM2 beamline at BESSY II. This device allows the investigation of the difference in the system’s behaviour after excitation with horizontally and vertically polarized light.

While the visible fluorescence region is dominated by lines of atomic carbon and oxygen fragments, the UV fluorescence shows molecular lines of the A¹ Π (v′) → X¹Σ⁺(v″) bands of the NO⁺ ion resulting from the participator Auger decay of the 1s⁻¹ π^* resonances.