The Astrophysical Journal • Vol 825 • No 2
HIGH-RESOLUTION ROTATIONAL SPECTRUM, DUNHAM COEFFICIENTS, AND POTENTIAL ENERGY FUNCTION OF NaCl
July 2016 • C. Cabezas, J. Cernicharo, G. Quintana-Lacaci, Isabel Peña, M. Agúndez, L. Velilla Prieto, A. Castro‐Carrizo, José Zúñiga, Adolfo Bastida, José L. Al…
ABSTRACT We report laboratory spectroscopy for the first time of the J = 1–0 and J = 2–1 lines of Na 35 Cl and Na 37 Cl in several vibrational states. The hyperfine structure has been resolved in both transitions for all vibrational levels, which permit us to predict with high accuracy the hyperfine splitting of the rotational transitions of the two isotopologues at higher frequencies. The new data have been merged with all previous works at microwave, millimeter, and infrared wavelengths and fitted to a series of…