Objective
The goal of the project was to research the method of spectroscopy which is best adapted to obtain very excited vibrational states in acetylene at energies where the classical movement of the molecule becomes chaotic.
The stimulated emission pumping (SEP) spectra technique presented some advantages but also serious limitations. It is a double resonance technique where a laser provides an initial intermediate excitational state which is then increased using a second laser stimulation. The intensity of the second laser is very important in this technique and can result in an overall reduction in fluorescence. Non linear effects of the technique also render interpretation of results difficult. Perhaps the greatest problem however, is that very long time periods are involved in obtaining high resolution spectra thereby rendering the technique inappropriate.
A second technique used, involving the use of stimulated photon echoes, also failed to provide satisfactory results. We then turned to an extremely simple technique known as dispersed fluorescence (DF). Using the advanced technologies we had developed through our previous laser system, as well as a better theoretical comprehension of the acetylene molecule, we have been able to choose an intermediate excited state to succeed in obtaining pure vibrational spectra.
A new spectroscopic technique is proposed to record the high-vibrational spectra of the electronic ground state of CS2. The measurement of tri-level photon echo intensity as a function of stimulating pulse frequency will provide improved signal-to-noise ratio over curently employed spectroscopic methods. Fourier transform techniques will be used to analyze the recorded spectra in order to reveal i)the onset of quantum chaos in this molecular system with the disappearance of good vibrational quantum numbers ii) the re-emergence of large amplitude vibrational modes within the chaotic region that may promote the onset of chemical reaction and iii) features identifiable with the results of computer models of molecular vibration.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- natural sciences chemical sciences organic chemistry aliphatic compounds
- natural sciences physical sciences optics laser physics
- natural sciences physical sciences theoretical physics particle physics photons
- natural sciences physical sciences optics spectroscopy
You need to log in or register to use this function
Programme(s)
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Topic(s)
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Data not available
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Call for proposal
Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
Data not available
Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
Funding Scheme
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Coordinator
38402 Saint-Martin-d'Hères
France
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.