Improved molecular constants for the X1 Σ+ and A1 Σ+ states of NaH
Fachbereich Physik, Universität Kaiserslautern, 67663 Kaiserslautern, Germany
Published online: 15 May 2000
Improved molecular constants for the and states of the NaH molecule are presented. NaH molecules are produced by reactive scattering of H and Na2 in a crossed beam experiment. High vibrational levels (6 9) of the NaH molecules are predominantly populated. Their excitation spectrum in the range has been measured using a new variant of Doppler spectroscopy. The transition frequencies involving the vibrational levels 2 8 in the and 6 9 in the state have been determined with an accuracy of better than . Using also previously published data a new set of molecular constants for the and state is derived. In particular, the vibrational dependence of the rotational constants B, D and H as well as some of v''-v' band origins for and is determined. The transition frequencies measured here or published previously are reproduced by these new coefficients with an accuracy of ≤ 0.1 cm-1 [rms value] with a maximum deviation of 0.4 cm-1. New RKR potential energy curves have been calculated up to the turning points of the levels v'' = 9 in the state and v' = 25 in the state.
PACS: 33.15.Mt – Rotation, vibration, and vibration-rotation constants / 33.20.Kf – Visible spectra
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000