Negative-Ion/Positive-Ion Coincidence Yields of Core-Excited Water

Novel Doubly Excited States Produced in Negative Ion Photodetachment

Direct probe of the bent and linear geometries of the core-excited Renner-Teller pair states by means of the triple-ion-coincidence momentum imaging technique.

The doubly degenerate core-excited Pi state of CO2 splits into two due to static Renner-Teller effect. Using the triple-ion-coincidence momentum imaging technique and focusing on the dependence of the measured quantities on the polarization of the incident light, we have probed, directly and separately, the linear and bent geometries for the B1 and A1 Renner-Teller pair states, as a direct proo...

Dynamics of proton migration and dissociation in core-excited ethyne probed by multiple ion momentum imaging.

The study focuses on the rapid geometry change in ethyne excited near the carbon 1s edge. Core excitation and ionization lead to population of dicationic states in ethyne. We study three competing dissociation pathways associated with deprotonation in the linear ethyne molecule, and two cases of rapid proton migration. We investigate the alignment of the molecule in the excited state and find s...

POSITIVE AND NEGATIVE ION MASS SPECTRA OF RING - SUBSTITUTED NITROBENZENES

The 70 ev positive and negative ion mass spectra of ring-substituted nitrobenzenes were studied. The influence of the substituent group on the fragmentation modes of the molecular ions is discussed. The effect of pressure in the formation of negative ions was also studied. As expected, the ratio of fragment ions to negative molecular ions decreased with increasing pressure in ion source.

Model Calculations of Ion Induced Desorption Yields

The ion induced desorption is a severe luminosity limitation for low charge state heavy ion accelerators. Thus it was intensively investigated in dedicated experiments during the last years. It was shown that the ion induced desorption is a surface effect with a strong link to the substrate [1]. The overall quantity of desorbed gas during long term irradiation is always in the range of a monola...