Precision spectroscopy of simple, calculable molecules has become an important tool to compare experiments with theory in effort test our understanding the fundamental laws physics. For this purpose, we have measured EF1Σg+(v′=0,N′=0)←X1Σg+(v″=0,N″=0) transition frequency molecular deuterium (D2) unprecedented accuracy. We use Ramsey-Comb at deep-ultraviolet wavelengths (201 nm) a two-photon, D...
