High Precision Cavity Ring Down Spectroscopy of 6ν₃ Overtone Band of ¹⁴N₂¹⁶O near 775 nm

Abstract

Transitions of the 6ν 3 overtone band of 14 N 2 16 O near 775 nm have been studied by continuous-wave cavity ring-down spectroscopy. Line positions and intensities were derived from a fit of the line shape using a hard-collisional profile. The line positions determined with absolute accuracy of 5×10 −4 cm −1 allowed us to reveal finer ro-vibrational couplings taking place after J>14 except a strong anharmonic interaction identified by the effective Hamiltonian model. The absolute line intensities have also been retrieved with an estimated accuracy of 2% for a majority of the unblended lines. A new set of ro-vibrational and dipole moment parameters were derived from the experimental values. A comparison between the line positions and intensities of the 6ν 3 band obtained in this work and those from previous studies is given.