Henson, BryceKhakimov, RomanDall, RobertTang, Li-YanTruscott, AndrewBaldwin, Kenneth2018-11-292018-11-290031-9007http://hdl.handle.net/1885/152396We present the first measurement for helium atoms of the tune-out wavelength at which the atomic polarizability vanishes. We utilize a novel, highly sensitive technique for precisely measuring the effect of variations in the trapping potential of confined metastable (2S13) helium atoms illuminated by a perturbing laser light field. The measured tune-out wavelength of 413.0938(9stat)(20syst)nm compares well with the value predicted by a theoretical calculation [413.02(9) nm] which is sensitive to finite nuclear mass, relativistic, and quantum electrodynamic effects. This provides motivation for more detailed theoretical investigations to test quantum electrodynamics.1 vol.application/pdfen-AUPlease add LPC student Bryce Henson as the first internal author... Thanks!I had requested it already and was replied that Bryce Henson was already there. I could find him with his U number only, as his family name is mispelled. Would you please update his name? Henson with a O. Thanks!201510.1103/PhysRevLett.115.0430042020-03-23