Two-photon ionization of cold rubidium atoms with a near resonant intermediate state
Autor: | Oliver Morsch, M. Anderlini, E J Robinson, Jörg H. Müller, E. Courtade, Mireille Aymar, Ennio Arimondo, D Ciampini |
---|---|
Rok vydání: | 2004 |
Předmět: |
Physics
Photon Thermal ionization chemistry.chemical_element Condensed Matter Physics Resonance (particle physics) Atomic and Molecular Physics and Optics Rubidium Optical pumping chemistry Ionization Physics::Atomic and Molecular Clusters Spontaneous emission Physics::Atomic Physics Atomic physics Ground state |
Zdroj: | Journal of Physics B: Atomic, Molecular and Optical Physics. 37:967-979 |
ISSN: | 1361-6455 0953-4075 |
Popis: | By means of a simple theoretical model and experimental results, we analyse the two-photon ionization of cold rubidium atoms. We consider a two-step process in which ground state atoms are ionized by two blue (421 nm) photons, chosen to be quasi-resonant with the 5S → 6P transition. We show that for a good description of the process we have to take into account not only the three states coupled by the laser radiation, but also all the atomic states involved in the spontaneous emission cascade from the 6P to the 5S state, since optical pumping from 5S1/2 (F = 2) to the 5S1/2 (F = 1) states modifies the ionization efficiency when ionizing near resonance. The experimental and theoretical determination of ionization cross sections for excitations near resonance with the 6P1/2 and the 6P3/2 intermediate levels is presented. |
Databáze: | OpenAIRE |
Externí odkaz: |