Berlin 2005 – wissenschaftliches Programm

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MO: Molekülphysik

MO 42: Poster II

MO 42.16: Poster

Dienstag, 8. März 2005, 14:00–16:00, Poster HU

Autoionization and double autoionization of the vibrationally selective excited N₂(1s⁻¹π_g^*)(v′)-resonances investigated by dispersed fluorescence spectroscopy (135nm≤ λ_Fl ≤185nm) — •L Werner¹, S Lucht¹, S Klumpp¹, H Schmoranzer¹, A Ehresmann¹, Ph V Demekhin², B M Lagutin², I V Petrov², V L Sukhorukov², S Mickat³, R Schill³, and K-H Schartner³ — ¹FB Physik, TU Kaiserslautern, D-67653 Kaiserslautern, Germany — ²Rostov State University of Transport Communications, 344038 Rostov-on-Don, Russia — ³I Physikalisches Institut, Justus-Liebig-Universität, D-35392 Gießen, Germany

Synchrotron radiation from the storage ring BESSY II has been used for the vibrationally selective inner-shell photoexcitation of the N₂(1s⁻¹π_g^*)(v′)-resonances using a bandwidth of 75meV at 400eV. The subsequent (double) autoionization into different vibrational levels of the N₂⁺ C ²Σ_u⁺ electronic state and into the N₂²⁺D ¹Σ_u⁺ state were investigated using photon-induced fluorescence spectroscopy (PIFS) by measuring the intensities of N₂⁺C−X and N₂²⁺D−X bands using a 1m normal incidence monochromator (135nm≤ λ_Fl≤185nm). Simultaneously to the dispersed fluorescence intensities the photoabsorption and the photoion signal were measured. Intensities of the N₂⁺C−X and N₂²⁺D−X-bands were measured as a function of the exciting-photon energy. The observed fluorescence intensities are interpreted using calculated Franck-Condon factors for the transition N₂X−N₂ π^*(excitation), N₂ π^*−N₂⁺C(autoionization) [or alternativly N₂ π^*−N₂²⁺D(double autoioization)] and N₂⁺C−N₂⁺X [or N₂²⁺D−N₂²⁺X].