We have developed a ``beam brightener'' in which several different laser cooling methods produce a highly monochromatic, unidirectional and intense beam of metastable Ne(3s;^3P_2) atoms. The beam brightener consists of four main stages. From an exited neon source we capture in a collimating section 5× 10^11 Ne(3s)/s from which ≈ 50 % is slowed to 100 m/s in a Zeeman slower. The final velocity distribution shows a width of 3.3 m/s uc(RMS,) corresponding to a temperature of 12 mK. A fraction of ≈ 25 % of these cold atoms is captured by a magneto-optic compressor and molded into a 0.7 mm uc(FWHM) wide atomic beam that contains up to 5× 10^10 Ne(3s)/s. The resulting density is 1.1× 10^9 Ne(3s)/cm^3. In the final step, a Doppler cooler is used to minimize the divergence of the beam to 10 mrad. This value will further improve once the Doppler cooler is replaced by a sub-Doppler cooler. We plan to use this ``bright beam'' to investigate the ionization probabilities in Ne(3s)+Ne(3s) collisions. Emphasis will be on the suppression of ionization when the atoms are spin-polarized. This has important implications for the possibilities of using metastable atoms for BEC-type experiments. Present adress: NIST
|Tijdschrift||Bulletin of the American Physical Society|
|Status||Gepubliceerd - 1998|
|Evenement||29th Annual Meeting of the APS Division of Atomic, Molecular, and Optical Physics (DAMOP), 27-30 May 1998 Santa Fe, NM, USA - Santa Fe, Verenigde Staten van Amerika|
Duur: 27 mei 1998 → 30 mei 1998
Tempelaars, J. G. C., Doery, M. R., Vredenbregt, E. J. D., Leeuwen, van, K. A. H., & Verhaar, B. J. (1998). A high-intensity beam of Ne(3s) atoms with application to ultra-cold ionizations properties. Bulletin of the American Physical Society, 43, 1367.