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The E-H-gradient balance technique has been used to measure the static electric dipole polarizabilities of the alkali-metal atoms and the tensor polarizabilities of the ^3P₂ metastable noble-gas atoms. All of the measurements are normalized to the scalar polarizability of ^3S₁ metastable helium, a value which has been accurately calculated. The scalar polarizabilities of the alkali atoms, in units of 10^-24 cm^3, are for lithium, 24. 3 0. 5; sodium, 23. 6 0. 5; potassium, 43. 4 0. 9; rubidium, 47. 3 0. 9; cesium, 59. 6 1. 2. For the ^3P₂ metastable noble-gas atoms we measure the zz components of the polarizability tensors for m₉=1 and 2, which completely determines the polarizability tensors for all m₉. For ₙₙ (m₉) we find, in units of 10^-24 cm^3, for neon, 28. 4 0. 6 (m₉=1) and 26. 7 0. 5 (m₉=2) ; argon, 49. 5 1. 0 (m₉=1) and 44. 7 0. 9 (m₉=2) ; krypton, 52. 7 1. 0 (m₉=1) and 46. 8 0. 9 (m₉=2) ; xenon, 66. 6 1. 3 (m₉=1) and 57. 4 1. 1 (m₉=2). The rare-gas results, while more precise, are in good agreement with earlier work. The alkali-metal results are in excellent agreement with recent theory and the experiment of Hall and Zorn.
Molof et al. (Tue,) studied this question.