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Emission Spectroscopy of AlH: the X¹Σ⁺, A¹Π and C¹Σ⁺ States Characteristics

100%
Szajna W., Zachwieja M., Hakalla R., Kępa R.
Acta Physica Polonica A
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2011
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vol. 120
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issue 3
417-423
EN
The visible spectrum of AlH has been investigated at high resolution between 20000 and 21500 cm^{-1} using a conventional spectroscopic technique. The AlH molecules were formed and excited in an aluminium hollow-cathode lamp with two anodes, filled with a mixture of Ne carried gas and a trace of NH_3. The emission from the discharge was observed with a plane grating spectrograph and recorded by a photomultiplier tube. The 0-0 and 1-1 bands of the C¹Σ⁺-A¹Π system and 0-2 band of the A¹Π-X¹Σ⁺ were identified at 21126, 21368 and 20276 cm^{-1}, respectively. In total 121 transition wave numbers belonging to three bands were precisely measured (with accuracy of ±0.003 cm^{-1}) and rotationally analysed. The new data were elaborated with the help of recent X¹Σ⁺ state parameters reported by White et al. and of the C¹Σ⁺, A¹Π states constants reported by Szajna and Zachwieja. As a result of this merged analysis the set of the molecular parameters and rotational terms values for the three lower lying states of the AlH molecule have been significantly improved.
2
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Reanalysis of the Ångström System (B^1 Σ^{+} - A^1Π) in the ^{13}C^{16}O Isotopic Molecule

100%
Hakalla R., Szajna W., Zachwieja M., Kępa R.
Acta Physica Polonica A
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2012
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vol. 122
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issue 4
674-682
EN
The emission spectrum of the Ångström system (B^1 Σ^{+} - A^1 Π) of ^{13}C^{16}O 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 ^{13}C 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^1 Σ^{+} Rydberg state have been significantly improved (B_0 = 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^1 Π state were reanalysed and confronted with the previously known ones.
3
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Analysis of the A^1Π State on the Basis of the Douglas-Herzberg Bands System in the CH+ Ion Molecule

100%
Hakalla R., Kępa R., Szajna W., Zachwieja M.
Acta Physica Polonica A
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2007
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vol. 111
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issue 6
821-834
EN
This paper presents an attempt of examining the irregularities appearing in a complicated A^1Π state of the CH^+ molecule with their reasons provided. By using the experimental data for the A^1Π-X^1Σ^+ bands system of the ^{12}CH^+ ion radical, it was proved that the vibrational and rotational quanta of the upper state reveal the same unusual behaviour, i.e. very clear nonlinear dependence on vibrational quantum number (v'≥3) of the upper state. Therefore, upper vibrational levels (v'≥3) of the A^1Π state cannot be determined by means of the equilibrium constants calculated in the previous works. Due to so far unidentified A^1Π state perturbations, the reduction of the wave numbers to the rovibronic parameters was carried out by means of individual, band-by-band analysis method, using with this end in view the nonlinear least squares method introduced by Curl and Dane, and Watson. This method allowed one to make already calculated constants of the rovibronic structure of regular lower state X^1Σ^+ of A-X system independent of possible perturbations appearing in the upper state of A^1Π of this system. It also enabled one to calculate for the first time the real (perturbed) term values for the A^1Π (v' =0, 1, 2, and 3) state of the ^{12}CH^+ ion molecule. These values suggest that rotational irregularities in the A^1Π state examined are negligibly small. In order to confirm the nonexistence of rotational perturbations in the A^1Π (v' =0, 1, 2, and 3) state, up to the observed J_max level, appropriate graphs of functions f_x(J) and g_x(J) introduced by Gerö and Kovács, where x = Q, PR, and overline{PR}, were drawn. Also, their course was analysed in detail.
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