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1 sistent with doppler broadening 15 this frequenc

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Unformatted text preview: mples. Spectra we 0 vq hq2 2m ¯ 2p 3 1.5 kHz for free particles. The taken for trapped condensates at three different densitie by compressing or decompressing the condensates in th Figure 3.2: Experimental pulsed on at anof momentum transfer cm2BEC by Bragg beams were observation intensity of about 1 mW to magnetic trap for a duration of 400 ms. To as shown in fig 3.1. sattering. Atoms were exposed to laser beamssuppress super-radiant Time of flight prior to the optical excitation. The Bragg Rayleigh scattering [10], both beams real linearly polartechnique converts momentum occupations into were space images. Figure taken resonance for the expanded cloud was ce tered at 1.54(15) kHz with an rms width of 900 Hz co ized in the plane defined by the condensate axis and the from Ref. [1]. sistent with Doppler broadening [15]. This frequenc wave vector of the light. includes an expected 160 Hz residual mean-field shif The Bragg scattering of a trapped condensate was analyzed by switching off the magnetic trap 100 ms after the end of the light pulse, and allowing the cloud to freely evolve for 70 ms. During the free expansion, the density of the atomic cloud dropped and quasiparticles in the condensate transformed into free particles and we...
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