| title: | Spectroscopic studies of the mechanism of creation and radiative decay of excimers and excimer-like centres in rare gases and rare gas crystals |
|---|---|
| reg no: | ETF5863 |
| project type: | Estonian Science Foundation research grant |
| subject: |
1.3. Physics |
| status: | accepted |
| institution: | TU Faculty of Physics and Chemistry |
| head of project: | Matti Selg |
| duration: | 01.01.2004 - 31.12.2007 |
| description: | Rare gases and rare gas crystals have attracted much interest as model systems in spectroscopy of diatomic molecules and in solid state physics for a long time. At normal conditions rare gases are nearly atomic, but using various excitation sources one can create a large number of strongly bound excited molecules or excimers R2* (R = Xe, Kr, Ar, Ne) in these media. The emission accompanying decay of these excimers can be used to create coherent light sources in VUV region. Therefore, studies of their relaxation dynamics, the shape of their potential curves, probabilities of electronic transitions and luminescence lifetimes are of great practical importance. The project combines VUV spectroscopic experimental studies with quantum mechanical calculations of spectra, contributing to creation of coherent light sources in VUV region and aiming at the following main goals: 1. Construct reliable potential curves for the excimers Xe2*, Kr2* ja Ar2* and for the relevant molecular ground states, ascertain approximate co-ordinate dependences of the transition moments that correspond to radiative decay of the excimers, and the absolute relaxation rates of their vibrational states. 2. Elucidate how the relaxation parameters of R2*-type centres depend on the density, temperature and the degree of ordering of the surrounding environment, calculate time-dependent emission spectra of free excimers Xe2*, Kr2*, Ar2* and their crystal analogues (self-trapped excitons) for different initial and registration times, and develop relevant experimental studies. 3. Work out a universal and effective numerical-analytical computational method to solve the Schrödinger equation, which would be convenient for spectroscopic applications. Compose a set of up-to-date computer programs needed to apply the method, and create a relevant user-friendly computational environment. 4. Apply the elaborated models to elucidate properties of essential optical materials (colour centres in quartz fibres). |
| project group | ||||
|---|---|---|---|---|
| no | name | institution | position | |
| 1. | Margarita Kink | University of Tartu | teadur | |
| 2. | Rein Kink | University of Tartu | laborijuhataja | |
| 3. | Vambola Kisand | University of Tartu | järeldoktor | |
| 4. | Juri Maksimov | University of Tartu | teadur | |
| 5. | Peep Miidla | TÜ MTRMI | dotsent | |
| 6. | Matti Selg | TU Faculty of Physics and Chemistry | senior researcher | |