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  • Obrazek miniatury
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    Reanalysis of the Ångström System (B1Σ+ - A1Π) in the 13C16O Isotopic Molecule.
    (Polish Academy of Sciences, Institute of Physics (Acta Physica Polonica A), 2012-10) Hakalla, Rafał; Szajna, Wojciech; Zachwieja, Mirosław; Kępa, Ryszard
    The emission spectrum of the Ångström system (B 1 Σ+-A 1π) of 13C 16O was obtained under high resolution with an accuracy estimated to be ±0:002 cm -1 as an emission spectrum using a high accuracy dispersive optical spectroscopy. The light source was a hollow-cathode lamp with two anodes built in our laboratory, with a previously deposited small quantity of 13C carbon on the electrodes. The emission from the discharge was observed with a plane grating spectrograph and recorded by a photomultiplier tube. In total 195 transition wave numbers belonging to the strongest 0-1 and 0-2 bands of the B-A system were precisely measured. The modern rotational reanalysis made it possible to verify the molecular information for the both combining states of the Ångström system. In particular the rovibrational constants for the B 1Σ + Rydberg state have been significantly improved (B0 = 1:8625054(65) cm -1 and D 0 = 6:1384(52) × 10 -6 cm -1) and the obtained equilibrium rotational constants of this state are more accurate than known to date. Numerous rotational perturbations observed in the A 1π state were reanalysed and confronted with the previously known ones.
  • Obrazek miniatury
    Pozycja
    Rotational analysis of the Ångström system (B1Σ+ - A1Π) in the rare 13C17O isotopologue.
    (Elsevier (Journal of Molecular Spectroscopy), 2012-02) Hakalla, Rafał; Zachwieja, Mirosław
    Although yet unobserved in the very rare 13C 17O isotopologue, the ngström system (B 1Σ +-A 1Π) was obtained under high resolution as an emission spectrum using a conventional spectroscopic technique. The emission from the discharge was observed with a plane grating spectrograph and recorded by a photomultiplier tube. In total, 192 transition wave numbers belonging to two bands (0-1 and 0-2) were precisely measured and rotationally analyzed. This method allowed us to determine the merged rotational constants B 0 = 1.8131941(58) cm -1 and D 0 = 5.5620(46) × 10 -6 cm -1 and the individual molecular constant B 1 = 1.471059(47) cm -1, D 1 = 5.315(64) × 10 -6 cm -1, B 2 = 1.451762(13) cm -1, D 2 = 7.812(16) × 10 -6 cm -1 for the as yet unanalyzed 13C 17O molecule B 1Σ + and A 1Π states, respectively. The band origins σ0 - v″ of the ngström system in the 13C 17O molecule were also calculated. Numerous rotational perturbations observed in the A 1Π state in 13C 17O molecule have been identified and analyzed in detail. The suspected candidates responsible for these irregularities were indicated by means of a graph of the rovibronic levels of the neighboring states based on the estimated term value in the 13C 17O molecule. The values of these perturbations have also been defined for both the e- and f-parity of the A 1Π(v = 1 and 2) state. Simultaneously, the B 1Σ + state was observed to be quite regular up to the observed J max level. © 2012 Elsevier Inc.