Black-Body Radiation Correction to the Polarizability of Helium

Details Black-Body Radiation Correction to the Polarizability of Helium Black-Body Radiation Correction to the Polarizability of Helium

2011-03-30

arxiv.org/abs/1103.5802v1

Phys.Rev.A 83 (2011) 042508

Physics

Atomic Physics

8 pages; RevTeX

Scientific paper

10.1103/PhysRevA.83.042508

The correction to the polarizability of helium due to black-body radiation is calculated near room temperature. A precise theoretical determination of the black-body radiation correction to the polarizability of helium is essential for dielectric gas thermometry and for the determination of the Boltzmann constant. We find that the correction, for not too high temperature, is roughly proportional to a modified hyperpolarizability (two-color hyperpolarizability), which is different from the ordinary hyperpolarizability of helium. Our explicit calculations provide a definite numerical result for the effect and indicate that the effect of black-body radiation can be excluded as a limiting factor for dielectric gas thermometry using helium or argon.

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