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We report site-resolved radiofrequency spectroscopy measurements ofBose-Einstein condensates of 87Rb atoms in about 100 sites of a one-dimensional10 micron-period magnetic lattice produced by a grooved magnetic film plus biasfields. Site-to-site variations of the trap bottom, atom temperature,condensate fraction and chemical potential indicate that the magnetic latticeis remarkably uniform, with variations in trap bottoms of only +/- 0.4 mG. Atthe lowest trap frequencies (radial and axial frequencies 1.5 kHz and 260 Hz,respectively), temperatures down to 0.16 microkelvin are achieved in themagnetic lattice and at the smallest trap depths (50 kHz) condensate fractionsup to 80% are observed. With increasing radial trap frequency (up to 20 kHz, oraspect ratio up to about 80) large condensate fractions persist and the highlyelongated clouds approach the quasi-1D Bose gas regime. The temperatureestimated from analysis of the spectra is found to increase by a factor ofabout five which may be due to suppression of rethermalising collisions in thequasi-1D Bose gas. Measurements for different holding times in the latticeindicate a decay of the atom number with a half-life of about 0.9 s due tothree-body losses and the appearance of a high temperature (about 1.5microkelvin) component which is attributed to atoms that have acquired energythrough collisions with energetic three-body decay products.

Radiofrequency spectroscopy of a linear array of Bose-Einstein condensates in a magnetic lattice