Search for dissertations about: "MOLECULAR-IONS"

Showing result 1 - 5 of 24 swedish dissertations containing the word MOLECULAR-IONS.

2. 1. Rotationally cold molecular ions in DESIREE : Threshold photodetachment thermometry of OH− and OD−

   Author : Gustav Eklund; Henning Schmidt; Roland Wester; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; fysik; Physics;

   Abstract : In experiments on molecular ions it is highly beneficial if the ions are in the electronic, vibrational and rotational ground state. Previous studies on these systems in ion traps or storage rings have been successful in preparing the molecular ions in the electronic and vibrational ground states, but the rotational degrees of freedom are experimentally more challenging due to their long relaxation times and the relatively small amounts of energy required for rotational excitations. READ MORE

4. 2. Electron Recombination with Small Molecular Ions

   Author : Johanna Brinne Roos; Hans Ågren; Åsa Larson; Hans Karlsson; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; dissociative recombination; ion-pair formation; resonant states; wave packet; molecular dynamics; electron scattering; Theoretical chemistry; Teoretisk kemi;

   Abstract : In this thesis I have theoretically studied electron recombination processes with small molecular ions. In these kind of processes resonant states are involved. To calculate the potential energy for these states as a function of internuclear distance, structure calculations and scattering calculations have to be performed. READ MORE

5. 3. Electron impact dissociation of molecular ions at CRYRING

   Author : Ahmed Al-Khalili; Ronald A Phaneuf; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Physics; fysik;

   Abstract : In this thesis, the electron impact dissociation of molecular ions has been studied using the ion storage ring CRYRING at Manne Siegbahn Laboratory in Stockholm, Sweden. The electron impact dissociation of molecular ions occurs via many processes, which lead to different charge states of the product fragments. READ MORE

6. 4. Dynamics in the Dissociative Recombination of Small Polyatomic Molecular Ions

   Author : Vitali Zhaunerchyk; Richard Thomas; Xavier Urbain; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; dissociative recombination; Molecular physics; Molekylfysik; Physics; fysik;

   Abstract : Dissociative recombination (DR) is a process in which a positive molecular ion recombines with an electron and subsequently dissociates into neutral fragments. Among the different types of molecular ion-electron reactions DR deserves particular attention due to the important role it plays in low-temperature and low-density plasmas. READ MORE

7. 5. Investigations of the breakup dynamics of small molecular ions recombining with electrons

   Author : Fredrik Hellberg; Mats Larsson; Robert Continetti; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Molecular physics; Molekylfysik;

   Abstract : Dissociative recombination is the process in which a molecular ion recombines with an electron and then fragments into neutral products. This process has been studied in many experiments over the years at the ion storage ring CRYRING at the Manne Siegbahn Laboratory, Stockholm University. READ MORE