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Details van artikel 2 van 12 gevonden artikelen
| Titel: |
Analysis of low-J perturbations in the B˜(000)2Σu electronic state of the CO2 molecular ion |
| Auteur: |
Watson, J. K. G. Vervloet, M. Rostas, J. Klapstein, D. |
| Verschenen in: |
Molecular physics |
| Paginering: | Jaargang 83 (1994) nr. 2 pagina's 211-233 |
| Jaar: |
1994-10-10 |
| Inhoud: |
The B˜(000)2Σu+ state of the CO2+ molecular ion is known from previous work to be seriously perturbed at low J by two other vibronic states, as well as showing a number of other smaller perturbations at higher J. New spectra of ultraviolet emission bands with the B˜(000)2Σu+ state as upper state, recorded with low rotational temperature to emphasize the low-J transitions, are reported and analysed here. These bands include the B˜(000)-X˜(000)2Πg band and longer wavelength B˜(000)-X˜(υ1υ2υ3) bands observed in the region of the A(000)2Πu-X˜(000)2Πg band. These long-wavelength bands are shown to be parallel bands with 2Σ(+)g or 2Σ(-)g lower states. It follows that the low-J perturbers of the B˜(000) state are one 2Σ(+)u and one 2Σ(-)u vibronic state. From their energies and symmetries, using the known parameters of the A2Πu electronic state, these states can now be identified as A(231)μ2Σ(+)u and A(151)κ2Σ(-)u. The parameters of the X˜2Πg electronic state permit the identification of the lower states of the long-wavelength bands as X˜(υ1, 3, υ3)μ2Σ(+)g or X˜(υ1, 5, υ3)κ2Σ(-)g with υ3 = 1 or 3 and with various values of υ1. This analysis is shown to agree with various features of previously observed spectra. Fits of the relative intensities of the rotational lines give rotational temperatures of 38 K and 35 K in two different jet-expansion sources, together with values of θ parameters where tan θ is the ratio of the A(151)κ2Σ(-)u-X˜(υ1υ2υ3)2Σg and A(231)μ2Σ(+)u-X˜(υ1υ2υ3)2Σg transition moments. These new data can be used to improve the empirical potentials of the X˜ and A electronic states, and the relative intensities should give information on the Franck-Condon overlaps of their vibronic wavefunctions. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 2 van 12 gevonden artikelen
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