Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 124, Issue 17, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2189237
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The (3)(1)Pi state of the NaCs molecule was studied by high resolution Fourier-transform spectroscopy. The (3)(1)Pi -> X (1)Sigma(+) laser induced fluorescence was excited by an Ar+ ion laser or by a single-mode frequency-doubled cw Nd:YAG laser. The presence of argon buffer gas yielded rich rotational relaxation spectra allowing to enlarge the data set for the (3)(1)Pi state term values, as well as to observe Lambda splittings in a wide range of vibrational (v') and rotational (J') quantum numbers. The data field includes about 820 energy levels of (3)(1)Pi NaCs in the range from v(')=0 to 37 and from J(')=3 to 190, which corresponds to ca. 95% of the potential well depth. Direct fit of the potential energy curve to the level energies is realized using the inverted perturbation approach method; a set of Dunham coefficients is also presented. (c) 2006 American Institute of Physics.
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