Fourier-transform spectroscopy of the A(2)Pi(i) - X-2 Sigma(+) system in CO+ and deperturbation analysis of the A(2)Pi(i)(nu=0, 1) levels

摘要

The A(2)Pi, state of (CO+)-C-12-O-16 has been reinvestigated using high-resolution, emission spectra obtained via Fourier-transform spectroscopy of the (0, 1), (0, 2), (1, 0) and (1, 1) bands of the Comet-Tail (A(2)Pi(i) - X-2 Sigma(+)) system with accuracy of up to 0.005 cm(-1). The high temperature (900K) of the emission discharge inside the hollow-cathode lamp permitted monitoring of high rotational quantum levels in A(2)Pi(i)(nu = 0, 1) up to J=48.5. All these bands together with the X-2 Sigma(+) - X-2 Sigma(+)(10, 1) and (10, 2) transitions deriving from a complex, spin-orbit, spin-electronic and L-uncoupling A(2)Pi(nu = 0) similar to X-2 Sigma(+)(nu=10) interaction as well as the B-2 Sigma(+) - X-2 Sigma(+)(6, 10) frequency transitions from our previous study were taken into consideration. In total, 1849 spectral lines were included in the comprehensive deperturbation analysis. This fit leads to a much improved description in terms of deperturbed molecular constants and interaction parameters compared to the previous studies of the same energy region in CO+. Moreover, the ro-vibronic term values of the A(2)Pi(i)(nu = 0) level and its perturber X-2 Sigma(+)(v = 10) were determined as well as Lambda-doubling of A(2)Pi(i)(nu = 0,1), gamma-doubling of X-2 Sigma(+)(nu = 10) and percentage (2)Pi character of these levels were considered in detail. (C) 2019 Elsevier Ltd. All rights reserved.