Attosecond spectroscopy: Study of the photoionization dynamics of atomic gases close to resonances
Description
The interaction of intense laser pulses with atomic and molecular gases results in exceptionally short bursts of XUV light, through the process of high-order harmonic generation of the fundamental laser frequency. This ultrashort radiation, in the attosecond (10-18 s) range, allows detailed investigations of ultrafast electron dynamics in matter. The work of this thesis consists in studying the photoionization delays close to different types of resonances, using the Rainbow RABBIT technique. This is a two-color interferometric technique (XUV + IR) that allows access to the time required for the electron to escape the atomic potential with high resolution. We are particularly interested in two cases: i) autoionizing resonances which are spectrally narrow (tens of MeV) and ii) Cooper-type minima which have a spectral width of some eV. The effect of these continuum structures on the corresponding ionization dynamics is studied. (author)
Abstract (French)
L'interaction des puissantes impulsions laser avec les gaz atomiques et moleculaires entraine l'emission de flashs exceptionnellement brefs de lumiere XUV grace au processus de generation harmonique d'ordre eleve (GHOE) de la frequence laser fondamentale. Ce rayonnement ultra-bref, dans la gamme attoseconde (10-18 s), permet des investigations detaillees de la dynamique electronique ultra-rapide dans la matiere. Le travail de cette these consiste a etudier les delais de photoionisation au voisinage de differents types de resonances, en utilisant la technique Rainbow RABBIT. Il s'agit d'une technique interferometrique a deux couleurs (XUV + IR) qui permet d'acceder au temps necessaire a l'electron pour s'echapper du potentiel atomique avec une haute resolution. Nous nous interessons particulierement a deux cas: i) les resonances auto-ionisantes spectralement etroites (dizaines de meV) et ii) les minima de type Cooper ayant une largeur spectrale de quelques eV. L'effet de ces structures de continuum sur la dynamique d'ionisation correspondante est etudie
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Additional details
Additional titles
- Original title (English)
- Spectroscopie attoseconde: etude de la dynamique de photoionisation de gaz atomiques au voisinage des resonances
Publishing Information
- Imprint Pagination
- 215 p.
- Report number
- FRCEA-TH--10827
INIS
- Country of Publication
- France
- Country of Input or Organization
- France
- INIS RN
- 53017487
- Subject category
- S71: CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS;
- Resource subtype / Literary indicator
- Thesis
- Descriptors DEI
- AUTOIONIZATION; DYNAMICS; GASES; HARMONIC GENERATION; INTERFEROMETRY; LASERS; PHOTOIONIZATION
- Descriptors DEC
- FLUIDS; FREQUENCY MIXING; IONIZATION; MECHANICS
Optional Information
- Notes
- 236 refs.; Available from the INIS Liaison Officer for France, see the INIS website for current contact and E-mail addresses