The CaOc³Σ⁺-a³Π_i(0,0) band

High-resolution Fourier transform spectroscopy of the CaO A1Σ+−X1Σ+ transition: New insights into perturbations by the and A1Π states

“…The derived constants are listed in Table 2. When Norman et al [12] studied the C 3 R + (v = 0) À a 3 P i (v = 0) transition of CaO, they observed a large and fairly constant K-doubling in the a 3 P 0 (v = 0) state. As the e-parity levels of the A 1 R + (v = 0) state do not mix with the f-parity levels of the a 3 P 0 (v = 6) state, we do not observe any Q fe lines of the a 3 P 0 (v = 6) À X 1 R + (v = 0) transition.…”

“…If we con- Table 3 Off-diagonal matrix element H, and value of J, denoted as J 0 , at the virtual crossing point of the interacting states in absence of perturbation [3,12]. This difference originates from the fact that we could identify about 40 term values of the perturbing a 3 P 0 þ ðv ¼ 6Þ state that allowed us to carry out a quantitative deperturbation of the first term values of the A 1 R + (v = 0) state.…”

Jet-cooled laser-induced dispersed fluorescence spectroscopy of ScN: Observation of a3Σ+ state

“…Vibrational frequencies could not be determined due to lack of observation of off-diagonal bands. The lower electronic state observed by Ram and Bernath [2] was assigned as the X 1 R + ground state, based on the comparison with the analogous transition in the isoelectronic CaO molecule [8] and the ab initio predictions of Kunze and Harrison [5]. The ground state assignment [2] was recently confirmed in our laboratory [1] by observation of laser excitation spectra of ScN in jet-cooled molecular beam.…”

ExoMol molecular line lists – XIII. The spectrum of CaO

“…The energy term values corresponding to the A ′ 1 Π, a 3 Π, b 3 Σ + states were taken directly from Norman et al (1989); Baldwin & Field (1990a). Additional X 1 Σ + and A ′ 1 Π energies were derived from the transition frequencies reported by Focsa et al (2000) (supplementary material) using combination differences.…”

“…Other experimental works on the electronic spectra of CaO include studies of the c 3 Σ + -a 3 Π band using the sub-Doppler intermodulation spectroscopy by Norman et al (1989), B 1 Π -b 3 Σ + bands by Baldwin & Field (1990a) and the green-band transitions of the F 1 Π -A ′ 1 Π and B 1 Π -A ′ 1 Π systems by Baldwin & Field (1990b) using the dispersed laser fluorescence spectroscopy; the…”