Experimental Techniques on Molecular Physics
Code
11523
Academic unit
Faculdade de Ciências e Tecnologia
Department
Departamento de Física
Credits
3.0
Teacher in charge
Paulo Manuel Assis Loureiro Limão Vieira
Weekly hours
2
Total hours
28
Teaching language
Português
Objectives
The main goal of this unit is to provide students with technical knowleadge and skills on Applied Atomic and Molecular Physics to Physical and Biomedical Engineering, among many others. This unit also aims at providing a reasonable technical approach to allow students to develop technical domain and well as earlier stage topuch with research, facing different sort of technical chalanges and applications.
Prerequisites
Previous knowleadge in:
Quantum mechanics
Atomic and Molecular Physics
Vacuum and Charged Particles Technologies
Instrumentation
Subject matter
1. TOF - Time-of-flight mass spectrometry;
Development of a TOF mass spectrometer (acceleration voltageseracao and beam collimation, mass callibration, ...)
Mass resolution, spatial and temporal distribution, kinetic energy release distribution;
Anion and cation production and detection;
Secondary beams production (e.g.. effusive beams, heating ovens);
Instrumentation (pulse generators, syncronous signal aquisition systems).
2. Charge transfer in atom-molecule collision experiments (relvant to atmospheric, industrial and biological molecules);
Hyperthermal neutral potassium beam production (alkali atoms);
Neutral secondary species production (e.g. Langmuir-Taylor detector);
Dispersion and functional dependence of neutral beams;
Secondary beams preparation (e.g. effusive beams, heating ovens);
Development of relevant instrumentation.
3. Dissociative Electron Attachment Processes in molecules (relvant to atmospheric, industrial and biological molecules);
Low-energy electron beam production (~ 70 meV);
Throcoidal electron monochromator with external magnetic field;
Production and collimation of low-energy electron beams (e.g. Faraday cups);
Secondary beam production (e.g.. effusive beams, heating ovens);
Development of proper instrumentation.
4. Molecular clusters: formation and detection ;
5. Electron transfer processes in anion H-, O-, OH- collisions with molecules (relvant to atmospheric, industrial and biological molecules);
production of anionic beams at intermediate and high energies;
Detection of anionic beams (e.g.. deflecting plates);
Wien filter;
Secondary beam production (e.g.. effusive beams, heating ovens);
Development of proper instrumentation.
Bibliography
- Gaseous Molecular Ions, E Illenberger, J Momigny, Springer Verlag NY, 1992.
- Atomic and Molecular Collisions, Sir Harrie Massey, Taylor and Francis, Ltd., 1979.
- Molecular Reaction Dynamics and Chemical Reactivity, R D Levine and R Bernstein, Oxford University Press, 1987.
Teaching method
Lectures. Problems solving. Examples.
Planned visits to several R&D laboratories within FCT-UNL.
Evaluation method
Evaluation deals with lectures (T) and lab demosntration (P), where both will contribute to the final mark;
Attendance: students will have to attend at least 2/3 of the lab demonstrations (P) which not include evaluation and the final mark (NP) has to be equal or greater than 9.5 out of 20. All students with previous record of attendance and a mark equal or greater than 9.5 are considered with attendance approval. Attendace approval once obtained willbe considered.
EVALUATUION:
Seminar presentation with a mark (NS) equal or greater than 9.5 out of 20. This mark will be displayed with one decimal place. Once obtained the student will keep it for just one academic year;
Lab demonstration with a mark (NL) equal or greater than 9.5 out of 20. This mark will be displayed with one decimal place. Once obtained the student will keep it;
Written test or written Exam with a mark (NT) or (NE) equal or greater than 9.5 out of 20. This mark will be displayed with one decimal place;
Lectures: The mark will be obtained through a written test or written exam with a mark (NT) or (NE) equal or greater than 9.5 out of 20. This mark will be displayed with one decimal place.
To be successful the mark (NL) has to be equal or greater than 9.5 out of 20. The final mark (NF), given with no decimal places, is given by:
NF = 0.5 NS + 0.3 NT + 0.2 NL or NF = 0.5 NS + 0.3 NE + 0.2 NL
For students with previous approval on lab demosntrations, the final mark (NF), given with no decimal places, is given by:
NF = 0.5 NS + 0.5 NT or NF = 0.5 NS + 0.5 NE
Whenever applicable and if needed, the lecturer or head of discipline may require an oral evaluation which may replace one of the evaluation criteria above.