“…It has to be emphasized however, that in any of the above Rydberg-state studies emission spectra in MRg complexes have not been observed, except one investigation. For the HgAr, Duval et al [4] recorded dispersed emission bound→bound spectra using the C 3 1(7 3 S 1 ), 𝜐 ′ = 3 → A 3 0 + (6 3 P 1 ), 𝜐′′, C 3 1, 𝜐 ′ = 14,19 → a 3 0 − (6 3 P 0 ), 𝜐′′ and C 3 1, 𝜐 ′ = 2,4,14 → b 3 2(6 3 P 2 ), c 3 1(6 3 P 2 ), d 3 0 − (6 3 P 2 ), 𝜐′′ transitions, as well as long bound→free undulated CID reflection [20] patterns using the 𝐶 3 1, 𝜐 ′ = 3, 11 → a 3 0 − , C 3 1, 𝜐 ′ = 2, 10 → A 3 0 + , B 3 1 and C 3 1, 𝜐 ′ = 3, 14 → b 3 2, c 3 1, d 3 0 − transitions; it allowed to probe and determine lower-lying state potentials including their repulsive branches.…”