Abstract
Two-colour polarisation labelling experiment measuring excitation spectra of Na in the spectral range 34, 600−39, 400 cm
has furnished observation of the previously unknown
electronic state. The excited state is characterised by a set of Dunham coefficients describing the f parity levels up to vibrational level v = 28 and the corresponding potential energy curve is constructed by the inverted perturbation approach method. Molecular parameters determined in the fit include
± 0.03 cm
,
± 0.03 cm
and
± 0.001 Å.
GRAPHICAL ABSTRACT
![](/cms/asset/0e325d27-ff9b-44b1-9a54-5f0181bd6ebe/tmph_a_2027536_uf0001_ob.jpg)
Acknowledgments
This article is dedicated to the late Professor Lutosław Wolniewicz in recognition to his outstanding contribution to quantum chemistry and molecular physics.
Disclosure statement
No potential conflict of interest was reported by the author(s).