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E. Wille, Ph.D. thesis, Innsbruck University, 2009.
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77951748936
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We use high-field imaging at 1190 G where the scattering length between Li|1 and |2 is small and negative. The Li cloud can thus be approximated as a weakly interacting Fermi gas which in the degenerate regime allows for easier interpretation of the profiles obtained by absorption images after time-of-flight.
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We use high-field imaging at 1190 G where the scattering length between Li|1 and |2 is small and negative. The Li cloud can thus be approximated as a weakly interacting Fermi gas which in the degenerate regime allows for easier interpretation of the profiles obtained by absorption images after time-of-flight.
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33
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77951701349
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Ph.D. thesis, University of Amsterdam
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T. G. Tiecke, Ph.D. thesis, University of Amsterdam, 2009.
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Tiecke, T.G.1
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K. M. O'Hara, S. L. Hemmer, M. E. Gehm, S. R. Granade, and J. E. Thomas, Science SCIEAS 0036-8075 10.1126/science.1079107 298, 2179 (2002).
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Grimm, R.1
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Nascimbène, S.1
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J. Zhang, E. G. M. van Kempen, T. Bourdel, L. Khaykovich, J. Cubizolles, F. Chevy, M. Teichmann, L. Tarruell, S. J. J. M.F. Kokkelmans, and C. Salomon, Phys. Rev. A PLRAAN 1050-2947 10.1103/PhysRevA.70.030702 70, 030702 (R) (2004).
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C. H. Schunck, M. W. Zwierlein, C. A. Stan, S. M. F. Raupach, W. Ketterle, A. Simoni, E. Tiesinga, C. J. Williams, and P. S. Julienne, Phys. Rev. A PLRAAN 1050-2947 10.1103/PhysRevA.71.045601 71, 045601 (2005).
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41
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X. Du, L. Luo, B. Clancy, and J. E. Thomas, Phys. Rev. Lett. PRLTAO 0031-9007 10.1103/PhysRevLett.101.150401 101, 150401 (2008).
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Du, X.1
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77951701348
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The rf transition frequencies for Li and K are 39 and 69 MHz, respectively. The π-pulses are approximately rectangular and have a total duration of 43 μs (333 μs) for K (Li). The duration of the Li pulse is much longer than that of the K pulse, because less rf power is available. The full width of the dominant central peak in the Fourier spectrum is 46 kHz for K and 6 kHz for Li. We can achieve transfer efficiencies higher than 99%.
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The rf transition frequencies for Li and K are 39 and 69 MHz, respectively. The π -pulses are approximately rectangular and have a total duration of 43 μ s (333 μ s) for K (Li). The duration of the Li pulse is much longer than that of the K pulse, because less rf power is available. The full width of the dominant central peak in the Fourier spectrum is 46 kHz for K and 6 kHz for Li. We can achieve transfer efficiencies higher than 99 %.
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43
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A slight off-resonant contribution of atoms in the K|2 state is visible on K|1 images. Since this contribution has a much larger spatial extent than the cloud of molecules, it is possible to correct for it when extracting data from the image. We also account for unpaired atoms not transferred by the rf pulse by independently measuring the π-pulse transfer efficiency.
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A slight off-resonant contribution of atoms in the K | 2 state is visible on K | 1 images. Since this contribution has a much larger spatial extent than the cloud of molecules, it is possible to correct for it when extracting data from the image. We also account for unpaired atoms not transferred by the rf pulse by independently measuring the π -pulse transfer efficiency.
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77951750291
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Li|2 atoms are directly imaged using a probe beam of appropriate frequency. Since we do not have a probe beam with the correct frequency to image K|2 atoms, we first transfer those atoms back to state |1 using another π-pulse and then take the image using the same K|1 probe beam as before. Atoms imaged on the first set of pictures have been accelerated and heated by the probe beam flash and have dispersed enough at the time the second image is taken to not influence it.
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Li | 2 atoms are directly imaged using a probe beam of appropriate frequency. Since we do not have a probe beam with the correct frequency to image K | 2 atoms, we first transfer those atoms back to state | 1 using another π -pulse and then take the image using the same K | 1 probe beam as before. Atoms imaged on the first set of pictures have been accelerated and heated by the probe beam flash and have dispersed enough at the time the second image is taken to not influence it.
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45
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R. V. Krems, W. C. Stwalley, and, B. Friedrich, eds., Cold Molecules: Theory, Experiment, Applications (CRC Press, Boca Raton, 2009).
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F. Ferlaino, S. Knoop, and R. Grimm, in Cold Molecules: Theory, Experiment, Applications, edited by, R. V. Krems, W. C. Stwalley, and, B. Friedrich, (CRC Press, Boca Raton, 2009), Sec. 9.2.4.
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Ferlaino, F.1
Knoop, S.2
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47
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77951742469
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The offset in dependence of the magnetic field originates from imperfect frequency adjustment of the K π-pulse and was determined by experiments during which molecule formation was inhibited by removing Li|1 from the sample with a short flash of resonant light before the molecule association magnetic field ramp. The offset is 1% at 168.9 G and rises to 10% 1.5 G away from that position.
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The offset in dependence of the magnetic field originates from imperfect frequency adjustment of the K π -pulse and was determined by experiments during which molecule formation was inhibited by removing Li | 1 from the sample with a short flash of resonant light before the molecule association magnetic field ramp. The offset is 1 % at 168.9 G and rises to 10 % 1.5 G away from that position.
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48
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33845202266
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RMPHAT 0034-6861 10.1103/RevModPhys.78.1311
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Cornell, E.A.7
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50
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77951762373
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A strong influence of broadband laser light on the lifetime of molecules was observed in experiments on cesium Feshbach molecules in Innsbruck. The lifetime substantially increased when the trapping light was provided by a single-frequency infrared laser.
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A strong influence of broadband laser light on the lifetime of molecules was observed in experiments on cesium Feshbach molecules in Innsbruck. The lifetime substantially increased when the trapping light was provided by a single-frequency infrared laser.
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51
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(in preparation).
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D. Naik, A. Trenkwalder, F. M. Spiegelhalder, C. Kohstall, G. Hendl, F. Schreck, and R. Grimm (in preparation).
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Naik, D.1
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Grimm, R.7
|