New spectroscopic investigations of the fourth-positive (A1Π→X1Σ+) system bands in the 13C16O molecule

High-Resolution Study of 13C16O A–X(v′ = 0–9) Bands Using the VUV-FTS at SOLEIL: Revised Term Values

“…We present records that go to higher J ′ values than Haridass and Huber for most v ′ levels and lower J ′ values for v ′ = 0. The bands in the visible portion of the spectrum studied by Kȩpa and colleagues ,, provide results for somewhat higher J ′. We confirm perturbations that these groups have previously observed and/or calculated.…”

“…The quality of the CO absorption spectra obtained with this instrument on 13 C 16 O shows significant improvement over that previously obtained by Haridass and Huber . These measurements allow us to study the numerous perturbations and confirm previously calculated and observed perturbations. , …”

“…Previous work on perturbations observed in v ′ = 0 to 6 was done by Kȩpa et al and later reanalyzed by Hakalla et al Later on, Kȩpa et al studied additional perturbations in the v ′ = 7–12 bands. Observed perturbations in our work, reported in Table , show general agreement with the catalogue of perturbations in these aforementioned papers.…”

“…We used Table 4 in Kepa et al 11 that contains the equilibrium molecular constants B e , α e , ε e , γ e , ω e , and ω e x e (in cm −1 ) of the A 1 Π state for the 13 9 This difference is on average −0.068 cm −1 . For the levels in common, 9 the largest difference corresponds to levels v′ = 3 and 7, where δ = −0.091 and −0.094 cm −1 , respectively.…”

First analysis of the Herzberg (C1Σ+→ A1Π) band system in the less-abundant13C17O isotopologue

“…27. An improved analysis of the n ¼ 0 and 1 levels of this state in the 12 C 16 O molecule has been recently presented by Niu et al 94 There is far less information on perturbations appearing in this state in the natural CO isotopologues, 41,60,[95][96][97][98] especially in the least-abundant 13 C 17 O. 27,28 The A 1 P(n ¼ 3) vibrational level in 13 C 17 O has not been studied so far.…”