Details
| Original language | English |
|---|---|
| Title of host publication | 2003 European Quantum Electronics Conference, EQEC 2003 |
| Publisher | Institute of Electrical and Electronics Engineers Inc. |
| Number of pages | 1 |
| ISBN (electronic) | 0780377338, 9780780377332 |
| Publication status | Published - 2003 |
| Externally published | Yes |
| Event | European Quantum Electronics Conference, EQEC 2003 - Munich, Germany Duration: 22 Jun 2003 → 27 Jun 2003 |
Abstract
Temperature dependence of the cross-section for elastic ground-state collisions of 52Cr- and 50Cr-atoms using the method of cross-dimensional relaxation, respectively is determined. The corresponding absolute values of the scattering length are on the order of 100a0 for 52Cr and 50a0 for 50Cr, respectively. However, to use evaporative cooling to increase the phase space density and achieve Bose-Einstein condensation with chromium atoms, have been limited to values below 10-2. Unusuually high inelastic collisio rates due to dipolar relaxation cause atom loss and heating of the sample. These losses are investigated and found similar magnetic-field-dependent rate coefficients (≈10-11 cm3s @ 50 G offset field) for the two isotopes 50Cr and 52Cr indicating that the strongly enhanced dipolar relaxation is a generic feature of the dipole-dipole interaction. This conclusion is supported by theoretical calculations. To circumvent these losses, an optical dipole trap is currently being set up. Here, chromium can be trapped in the energetically lowest state where dipolar relaxation is absent.
ASJC Scopus subject areas
- Engineering(all)
- Electrical and Electronic Engineering
- Physics and Astronomy(all)
- Atomic and Molecular Physics, and Optics
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2003 European Quantum Electronics Conference, EQEC 2003. Institute of Electrical and Electronics Engineers Inc., 2003. 1314133.
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Collisional properties of a dipolar gas of ultracold chromium atoms
AU - Hensler, S.
AU - Schmidt, Piet Oliver
AU - Werner, J.
AU - Griesmaier, A.
AU - Görlitz, A.
AU - Pfau, T.
PY - 2003
Y1 - 2003
N2 - Temperature dependence of the cross-section for elastic ground-state collisions of 52Cr- and 50Cr-atoms using the method of cross-dimensional relaxation, respectively is determined. The corresponding absolute values of the scattering length are on the order of 100a0 for 52Cr and 50a0 for 50Cr, respectively. However, to use evaporative cooling to increase the phase space density and achieve Bose-Einstein condensation with chromium atoms, have been limited to values below 10-2. Unusuually high inelastic collisio rates due to dipolar relaxation cause atom loss and heating of the sample. These losses are investigated and found similar magnetic-field-dependent rate coefficients (≈10-11 cm3s @ 50 G offset field) for the two isotopes 50Cr and 52Cr indicating that the strongly enhanced dipolar relaxation is a generic feature of the dipole-dipole interaction. This conclusion is supported by theoretical calculations. To circumvent these losses, an optical dipole trap is currently being set up. Here, chromium can be trapped in the energetically lowest state where dipolar relaxation is absent.
AB - Temperature dependence of the cross-section for elastic ground-state collisions of 52Cr- and 50Cr-atoms using the method of cross-dimensional relaxation, respectively is determined. The corresponding absolute values of the scattering length are on the order of 100a0 for 52Cr and 50a0 for 50Cr, respectively. However, to use evaporative cooling to increase the phase space density and achieve Bose-Einstein condensation with chromium atoms, have been limited to values below 10-2. Unusuually high inelastic collisio rates due to dipolar relaxation cause atom loss and heating of the sample. These losses are investigated and found similar magnetic-field-dependent rate coefficients (≈10-11 cm3s @ 50 G offset field) for the two isotopes 50Cr and 52Cr indicating that the strongly enhanced dipolar relaxation is a generic feature of the dipole-dipole interaction. This conclusion is supported by theoretical calculations. To circumvent these losses, an optical dipole trap is currently being set up. Here, chromium can be trapped in the energetically lowest state where dipolar relaxation is absent.
UR - http://www.scopus.com/inward/record.url?scp=84947219050&partnerID=8YFLogxK
U2 - 10.1109/EQEC.2003.1314133
DO - 10.1109/EQEC.2003.1314133
M3 - Conference contribution
AN - SCOPUS:84947219050
BT - 2003 European Quantum Electronics Conference, EQEC 2003
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - European Quantum Electronics Conference, EQEC 2003
Y2 - 22 June 2003 through 27 June 2003
ER -