Berlin 2001 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
A: Atomphysik
A 17: Posters Friday (Spectroscopy)
A 17.12: Poster
Freitag, 6. April 2001, 12:30–15:00, AT3
Density matrix treatment of deformed Cs bubbles in solid 4He — •Nettels Daniel, Taro Eichler, Reinhard Müller-Siebert, and Antoine Weis — Département de Physique, Université de Fribourg (CH)
The magnetic properties of alkali atoms implanted in crystalline 4He matrices are extremely sensitive to the symmetry of the trapping sites. For Cs atoms trapped in the body-centered-cubic (b.c.c) phase of 4He spin relaxation times up to 1 s have been observed. In the hexagonal-closed-packed phase (h.c.p.) on the other hand the spins are readily depolarized and a number of phenomena specific for this phase, such as zero field magnetic resonance spectra, forbidden transitions, field dependent relaxation times, anomalous hyperfine shifts, etc. have been observed in a magnetic resonance experiment with optical detection.
We present a theoretical approach to these phenomena based on density matrix calculations taking optical pumping, radio frequency transitions and interactions with randomly distributed quadrupolar deformations into account.