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I show that neutral lithium couples strongly to the cosmic microwave background (CMB) through its 6708A resonant transition after it recombines at z~500. At observed wavelengths of <335 micron, the CMB anisotropies are significantly altered since the optic

Fig.1.—RedshiftevolutionofthedynamicaldragtimeduetotheLi6708 Aresonancewiththemicrowavebackground.Thedragtimeshownbythesolidlineshouldbedividedbytheneutralfractionoftheprimordiallithiumabundance(XSBBN=3.8×10 10,seeBurlesetal.2001),asafunctionofredshift.Thedottedlineshowstheresultforoneoftherecombinationhistoriesoflithiumintheliterature(Pallaetal.1995).Forcomparison,theThomsondragtimeisplottedasthedashedline,takingaccountofthefullrecombinationhistoryofhydrogen.Inallcases,thedragtimesarenormalizedbytheHubbletime,H 1(z).