Sökning: "negative ions"
Visar resultat 16 - 20 av 125 avhandlingar innehållade orden negative ions.
16. Photodetachment Studies of Negative Ion Structure
Sammanfattning : The structure of atomic negative ions has been investigated experimentally by studying photodetachment, which is the process of photon-induced electron emission from a negative ion. The interaction between the valence electrons and the nucleus is weaker in negative ions than in atoms and positive ions. LÄS MER
17. Lifetime measurements of metastable levels in positive and negative singly charged ions
Sammanfattning : .... LÄS MER
18. Dynamics and Structure of Negative Ions - Photoinduced double detachment on nano- and femtosecond time scales
Sammanfattning : The goal of the presented work is to investigate double detachment of negative ions on nano- and femtosecond time scales. I have performed three types of experiments. Femtosecond time resolved pump-probe experiments have been performed on electron dynamics in the valence shell of carbon, silicon and germanium atoms. LÄS MER
19. Laser Spectroscopic Investigations of Decay Properties in Stored Ions
Sammanfattning : Investigations and measurements of metastable states are in many ways very important. Spectroscopists, theorists and astrophysicists have all great interest and requirements regarding knowledge about such states and their properties. LÄS MER
20. Mutual Neutralization in collisionswith oppositely charged fullerene(C60) ions
Sammanfattning : In this thesis, results from Mutual Neutralization experiment carried out atthe DESIREE facility, involving merged interacting ion beams, of oppositelycharged C60 ions are presented. This reaction may be of importance for explain-ing reliable estimates of the ionization balance in astrophysical environments,which defines the chemistry in molecular gas clouds. LÄS MER