High-precision laser spectroscopy of the CO A${}^1\Pi$ - X${}^1{\Sigma }^{+}$ (2,0), (3,0) and (4,0) bands

M. L. Niu, F. Ramirez, E. J. Salumbides +1

High-precision two-photon Doppler-free frequency measurements have been performed on the CO A${}^1\Pi$ - X${}^1{\Sigma }^{+}$ fourth-positive system (2,0), (3,0), and (4,0) bands. Absolute frequen…