52 research outputs found
Coherent excitation of the singlet-triplet mixed 1s4f state of helium
In this paper, we present a detailed theoretical description for the coherent electron-impact excitation, the subsequent time evolution, and the cascading decay process of the singlet-triplet mixed 1s4f state of helium. The excitation amplitude and phase of each sublevel of this state are related to measurable coincidence intensities and polarizations of the emitted photons. It is found that the intensity and polarization of the emitted photons are time modulated due to the singlet and triplet mixing in the 1s4f state
Uso tópico de ketanserina na cicatrização de feridas cutùneas induzidas em equinos
Bose-Einstein condensates in atomic gases: simple theoretical results
These notes present simple theoretical approaches to study Bose-Einstein
condensation in trapped atomic gases and their comparison to recent
experimental results : - the ideal Bose gas model - Fermi pseudopotential to
model the atomic interaction potential - finite temperature Hartree-Fock
approximation - Gross-Pitaevskii equation for the condensate wavefunction -
what we learn from a linearization of the Gross-Pitaevskii equation -
Bogoliubov approach and thermodynamical stability - phase coherence properties
of Bose-Einstein condensates - symmetry breaking description of condensatesComment: 146 pages, 17 figures, Lecture Notes of Les Houches Summer School
199
Emprego de membrana de quitosana em feridas cutĂąneas induzidas experimentalmente em equinos
Home-range and space use by Didelphis albiventris (Lund 1840) (Marsupialia, Didelphidae) in Mutum Island, ParanĂĄ river, Brazil
Coherence analysis of the He 1s4f state
Theoretical calculations of the Stokes parameters were performed for the 3 1Dâ2 1P transition in the decay of the 1s4f state of helium. Three different distorted-wave calculations were compared with the measurements of Cvejanovic and Crow and reasonable agreement was found for all three models. Overall, the ground state potential model was in good agreement with the data than the other two models. However, it is difficult to make a distinction between the theories due to the size of the error bars and the similarity of the theoretical results
- âŠ