Projects / Programmes source: ARIS

Processes with vibrationally excited hydrogen molecules

Research activity

Code Science Field Subfield
1.02.00  Natural sciences and mathematics  Physics   

Code Science Field
P230  Natural sciences and mathematics  Atomic and molecular physics 
hydrogen molecule, vibrational excitation, dissociative attachment, recombination on surfaces, IBA methods, IBA methods, ERDA
Evaluation (rules)
source: COBISS
Researchers (8)
no. Code Name and surname Research area Role Period No. of publicationsNo. of publications
1.  20244  PhD Klemen Bučar  Physics  Researcher  2004 - 2007  180 
2.  20219  PhD Iztok Čadež  Physics  Head  2004 - 2007  228 
3.  15648  PhD Matjaž Kavčič  Physics  Researcher  2004 - 2007  240 
4.  25624  PhD Sabina Markelj  Physics  Junior researcher  2007  230 
5.  08013  MSc Matjaž Mihelič  Physics  Researcher  2004 - 2007  78 
6.  12314  PhD Primož Pelicon  Physics  Researcher  2004 - 2007  579 
7.  05591  MSc Zdravko Rupnik  Physics  Researcher  2004 - 2007  182 
8.  18891  PhD Jurij Simčič  Physics  Researcher  2004 - 2007  136 
Organisations (1)
no. Code Research organisation City Registration number No. of publicationsNo. of publications
1.  0106  Jožef Stefan Institute  Ljubljana  5051606000  88,083 
We will study processes involving vibrationally excited hydrogen molecules (H2, D2 and HD) - collisions with electrons and processes at surfaces. In particular, we will study dissociative electron attachment to hydrogen molecule that leads to formation of the stable negative ions H- or D-. Cross section for this process will be studied by an experimental set-up, that will be constructed for this purpose. The apparatus will be adapted for the use of low energy electron beam and for high selectivity and efficiency of low energy ion detection. This apparatus will be also used for diagnostics of vibrational population of hydrogen molecules. We will further improve method which we developed previously (Popović et al., Meas.Sci.Technol. 1 (1990) 1041) that is based on a strong increase of the dissociative attachment cross section with vibrational excitation of target hydrogen molecule. the set-up for diagnostics of vibrational excitation of hydrogen molecules will be used for studies of surface reactions in which such molecules are formed (atom recombination, molecular desorption) or in which such molecules are incident projectiles (vibrational relaxation, adsorption). Studied surfaces will be exposed to the low-pressure neutral or weakly ionised hydrogen atmosphere of known dissociation rate and vibrational state distribution. Surface reactions to be studied are strongly related to the internal excitation of incident or product molecules. In order to acquire complete information on the process we will also measure in real time the hydrogen distribution beneath the surface. This will be performed by ERDA (Elastic Recoil Detection Analysis) an ion beam analysis method, which is available on our 2MV tandem accelerator. Proposed research is important for understanding phenomena in edge plasma and in the plasma facing walls of the tokamak devices, for astrophysics and for understanding reactions at surfaces and in hydrogen containing plasmas.
Views history