Abstract
Gas-phase emission spectra of the hitherto unknown free radical NaAs were measured in the NIR region with a Fourier-transform spectrometer. The emissions were observed from a fast-flow system in which arsenic vapor in argon carrier gas was passed through a microwave discharge and mixed with sodium vapor in an observation tube. Seven transitions from all five Ω components of the low-lying A3Π and a1Δ excited states (A12, A21, A30+, A40−, a2) to the X10+ and/or X21 components of the X3Σ− ground state have been observed and analysed. With the help of parallel relativistic configuration interaction calculations all observed spectral features could be assigned and analyzed.
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