https://doi.org/10.1007/s100530050546
Improved molecular constants for the X1 Σ+ and A1 Σ+ states of NaH
Fachbereich Physik, Universität Kaiserslautern, 67663 Kaiserslautern, Germany
Received:
21
August
1999
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
