Abstract
YN molecules have been produced in a pulsed free jet apparatus by laser vaporizing yttrium metal in the presence of He doped with NH 3. Laser induced dispersed fluorescence spectra have been studied. Previously unobserved low-energy excited state, a 3 Σ + , has been discovered. RKR potential curves of the X 1 Σ + ground state as well as of the A 1 Σ + and a 3 Σ + excited states have been determined. Harmonic wavenumbers have been measured to be equal to: 633.2(10), 1007.4(25), and 805.12(63) cm −1 for the X 1 Σ + , A 1 Σ + , and a 3 Σ + states, respectively.
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