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Contenuto archiviato il 2024-04-16

SPIN POLARISATION OF MOLECULAR OF PHOTOELECTRON IN DIATOMIC MOLECULES

Obiettivo


The rotationally resolved differential photoionization cross section and integrated spin polarization of the hydrogen iodide molecule were obtained in the region of high Rydberg series (up to n=12). Because of the many rotational and vibrational perturbations and the modification of electronic spaungs and interaction when passing from one Rydberg series to another, interpretation in difficult, and the theoretical work requires the introduction of rotational autoionization for the phetorionization differential cross section. The type of coupling between the angular momenta involved in the system was studied, in the open continuim and when autoionization resonances were introduced.

A new system was built, covering the far ultraviolet region, for the study of hydrogen chloride. The system in windowless and uses noble gases as laser sources. Spectra of hydrogen chloride and deuterium chloride have been obtained.
Photoionisation of heavy diatomic molecules with large spin orbit and rotational constants will be studied. The total cross section and the spin polarisation of the photoelectron are measured with a set-up already funded. To reduce the number of rotational levels showing up in the spectrum the measurements are made at low temperature using a supersonic expansion.
The purpose of the present twinning is to interpret the experimental spectra obtained by the Bielefeld group. The use of this elaborate experimental set-up will allow a much deeper understanding of mechanisms of excitation of the electron as well as of its
interactions with the ion when leaving the molecule.The possibility of such a detailed analysis is due to the fact that the spin polarisation contain an information which is missing in the total and differential cross sections.
The interaction between experimentalists and theoreticians is essential to interpret these spectra.
Recent advances in mutagenesis and genetic mapping, particularly in European laboratories, now make possible detailed genome analysis of the mouse, the genetically best known vertebrate. The three Institutes propose a joint effort to this end, using advanced genetic and melecular techniques, with emphasis on the genes relevant for tumor and disease susceptibility and development, and their human homologues, and on genetic models for human disease. The specific tools developed in individual Institues for identification and mapping of genes, namely mutant stocks, recombinant congenic strains, and interspecific backcrosses, complement each other and will also be used to correlate physical maps with linkage maps. The identified genes will be cloned and analyzed for their function using transgenic mice and mutagenesis by homologous recombination.

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Coordinatore

CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE
Contributo UE
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Indirizzo
Bètiment 210 - Université Paris-Sud
91405 GOMETZ LA VILLE
Francia

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