High precision spectroscopy of light atoms for future tests of QED

We report the most recent progress on high precision spectroscopic measurements from the Williams’ Lab at Smith College. We will report on excited-state spectroscopy measurements of oxygen, nitrogen, and beryllium transitions. For oxygen, we report on measurements of nine absolute transition frequencies between the 2s²2p³(⁴S⁰)3p ⁵P states and the 2s²2p³(⁴S⁰)3d ⁵D⁰ states. For nitrogen, we report on three absolute transition frequencies between the 2s²2p²(³P)3s ²P states and the 2s²2p²(³P)3p ²D⁰ states. For beryllium, we report on the absolute energy of the 2s3s ¹S₀ state. Combined with future theoretical predictions and experimental results, this work will serve as a test for quantum electrodynamics.