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arXiv physics/0212024physics.atom-ph
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亚稳态$^3P_2$原子锶的磁俘获

Magnetic trapping of metastable $^3P_2$ atomic strontium

S. B. Nagel, C. E. Simien, S. Laha, P. Gupta, V. S. Ashoka, T. C. Killian

摘要:

本文报道了亚稳态$^3P_2$原子锶的磁俘获。原子被冷却在磁光阱(MOT)上的偶极允许的$^1S_0-^1P_1$跃迁在461 nm。通过$^1P_1\to {^1D_2}\to {^3P_2}$的衰减连续加载由MOT的四极磁场形成的磁阱。在密度为$8 \times 10^9$ cm $^{-3}$和温度为1 mK的$10^8$原子上捕获。原子温度明显低于当它们从MOT转移时从原子的动能和势能所预期的温度。这表明,热化和蒸发冷却发生在磁阱。

英文摘要:

We report the magnetic trapping of metastable $^3P_2$ atomic strontium. Atoms are cooled in a magneto-optical trap (MOT) operating on the dipole allowed $^1S_0-^1P_1$ transition at 461 nm. Decay via $^1P_1\to {^1D_2}\to {^3P_2}$ continuously loads a magnetic trap formed by the quadrupole magnetic field of the MOT. Over $10^8$ atoms at a density of $8 \times 10^9$ cm$^{-3}$ and temperature of 1 mK are trapped. The atom temperature is significantly lower than what would be expected from the kinetic and potential energy of atoms as they are transferred from the MOT. This suggests that thermalization and evaporative cooling are occurring in the magnetic trap.

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