Laser and Fourier-transform spectroscopy of KCa
Laser and Fourier-transform spectroscopy of KCa
KCa was produced in a heat-pipe oven and its thermal emission spectrum around $8900\phantom{\rule{0.16em}{0ex}}{\mathrm{cm}}^{\ensuremath{-}1}$ was recorded with a high-resolution Fourier-transform spectrometer. In addition, many selected transitions of this spectrum between deeply bound vibrational levels of the $X{(1)}^{2}{\mathrm{\ensuremath{\Sigma}}}^{+}$ and ${(2)}^{2}{\mathrm{\ensuremath{\Sigma}}}^{+}$ states were studied using laser excitation to facilitate the assignment of …