Eur. Phys. J. D 30, 49-55 (2004)
https://doi.org/10.1140/epjd/e2004-00060-0

Reinvestigation of the B²Σ⁺ → X²Σ⁺ system in the CO⁺ molecule

The B²Σ⁺ → X²Σ⁺ system in CO⁺

Atomic and Molecular Physics Laboratory, Institute of Physics University of Rzeszów, 35-310 Rzeszów, Poland

Corresponding author: ^a szajna@univ.rzeszow.pl

Received: 19 January 2004
Revised: 15 March 2004
Published online: 27 April 2004

Abstract

Conventional, high resolution molecular spectroscopy has been employed to record emission spectra of the first negative bands system in the ¹²C¹⁶O⁺ molecule. Twenty two bands form the progressions and 6-10 band were photographed in the  cm^-1 spectral region. The reduction of the spectrum for the individual bands has been performed via a nonlinear least-squares fit with the effective Hamiltonians of Brown et al. [J. Mol. Spectrosc. 74, 294 (1979)]. The final molecular constants for both the () and () states were obtained from global merge calculations of the present data of the system and previously obtained in our laboratory data for and systems in the CO⁺ molecule. Merged molecular parameters have been used in order to the determine the equilibrium constants for both considered states. The  cm^-1 and  cm^-1 constants for the  state were obtained for the first time. The RKR potentials have been calculated for both combining states, as well as Franck-Condon factor and r-centroids for the first negative system in the ¹²C¹⁶O⁺ molecule. Furthermore, we report the value of the electronic isotopic shift  cm ^-1 of the  system in ¹³C¹⁶O⁺, calculated on the basis the presents results and those obtained by us previously for the ¹³C¹⁶O⁺ molecule.