The N2 1sB 2 Xd dispersed fluorescence from photon excited N2 molecules has been measured in the 19–34 eV excitation range, where our theory predicts the existence of non-Rydberg doubly excited resonances which autoionize in the sub-fs regime into the N2 1 B2S1u ionic state. The experimentally deduced vibrational branching ratios sy0 ­ 1dysy0 ­ 0d revealed five prominent features, four of which could be identified as such doubly excited resonances based on the lowest order of the many-body perturbation theory. [S0031-9007(96)00230-X]

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Ionization and fragmentation processes of the NO molecule following the excitation of the nitrogen 1s electron have been studied by means of high-resolution mass-selective ionyield measurements. The yields of N + , O + and NO + ions acquired with a quadrupole mass spectrometer (QMS) and a linear time-of-flight spectrometer (TOF) show surprising differences at the N(1s −1 ) threshold region suggesting the selective attachment of the excited core electron to the N + centre during the dissociation of the NO + ion. The fragmentation branching ratios corrected for the angular and kinetic energy effects are presented. The kinetic energy distributions of the N + and O + fragments have been extracted for a number of Rydberg states manifesting a significant dependence on l quantum number and energy of the primary excited Rydberg level. The lifetime of the core-excited N(1s −1 ) state has been found from the shape of the low kinetic energy electron spectra acquired above the 1 and 3 thresholds.

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Photoabwrption by atomic Au in lhe 5p and 4f excitation region has been studied using the dual laser plasma DLP technique. The observed features are dominated by two prominent Fano-type resonance lines which wn be attributed to 5p -t 5d and 4f -5d Uansitions of valence excited Sd96s2('0sp) Au followed by autoionization. The experimental results are campared to specha calculated for the excitalion of 5d'06s'?S1p) ground and 5 d ' 6 ~~( ~D 5 / 2 , 'bo) valence-excited sfates within the (R)Haruee-Fock thmry and the relativistic time dependent local density approximation.