Strong interference effects in the angularly resolved Auger decay and fluorescence emission spectra of the core-excited NO molecule

Ph V Demekhin (1, 2) , I D Petrov (2) , V L Sukhorukov (2) , W Kielich (2) , A Knie (2) , H Schmoranzer (3) , A Ehresmann (2)

1 Institute of Physics and CINSaT
2 Rostov State University of Transport Communications
3 Department of Physics

Angular distributions of the Auger electrons and subsequent fluorescence photons are studied theoretically and experimentally in the vicinity of the core excitations of NO. In the calculations, lifetime vibrational interference and electronic states interference were taken into account ab initio. The interference between excitation-deexcitation amplitudes for transitions via symmetry different intermediate resonances 1s −1 2π 2 (2 ∆, 2 Σ ±), which is forbidden in the solid-angle-averaged or magic-angle-recorded decay spectra, plays a crucial role in the formation of the angularly resolved decay spectra. Experimentally, angular distribution parameters for the NO + A 1 Π → X 1 Σ + fluorescence induced by linearly polarized synchrotron radiation are determined in the vicinity of the N * O resonance in the Raman regime for core excitation. Theoretical results are in good agreement with the present experimental fluorescence spectra and with available vibrationally and angularly resolved resonant Auger electron spectra.

Mots clés: 33.80.Eh; 32.80.Hd; 33.50.Dq; 33.80.-b

Ph V Demekhin, I D Petrov, V L Sukhorukov, W Kielich, A Knie, et al.. Strong interference effects in the angularly resolved Auger decay and fluorescence emission spectra of the core-excited NO molecule. Journal of Physics B: Atomic, Molecular and Optical Physics, 2010, 43 (16), pp.165103. ⟨10.1088/0953-4075/43/16/165103⟩. ⟨hal-00569825⟩