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We report on a substantial light-force-induced line-center shift of the sub-Doppler dip in a saturation spectroscopy configuration where mechanical effects are expected to be negligible. We observe the shift on the 2³S₁→2³P₁ open transition of ⁴He that is relevant for a determination of the fine-structure constant α [Phys. Rev. Lett. 82, 1112 (1999)]. We discuss the physical origin of the shift and we provide a numerical analysis to support our interpretation. The shift can be quite important for various other high-precision spectroscopy measurements.
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Minardi et al. (1999) studied this question.
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