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Fourier Transform Spectra of the E2Πu–X2Πg(3/2) System of CuCl2: 2. Rovibronic Levels of the Ground State up to 4000 cm−1

✍ Scribed by E. Bosch; P. Crozet; A.J. Ross; J.M. Brown

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
168 KB
Volume
202
Category
Article
ISSN
0022-2852

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✦ Synopsis

High-resolution Fourier transform spectra of the laser-induced fluorescence of 63 Cu 37 Cl 2 produced in a cell have been recorded following excitation of a single vibronic level of the E 2 ⌸ u electronic state. Fluorescence occurs in combination bands 1 v1 vЈ 1 2 v2 vЈ 2 3 v3 vЈ 3 to a broad spread of levels in the ground electronic state. A global vibronic model is proposed for the ground state based on an effective Hamiltonian, which fits the experimental data (2782 fluorescence lines, lower state quantum numbers: v 1 ϭ 0 -6, v 2 ϭ 0 -2, v 3 ϭ 0 -6, and J ϭ 4 1 2 -80 1 2 ) to 0.019 cm Ϫ1 rms error. Vibrational, rotational and Renner-Teller parameters are obtained (e.g., 2 ϭ 95.195(36) cm Ϫ1 , B e ϭ 0.055106(3) cm Ϫ1 , ⑀ ϭ Ϫ0.1893(28)). A revised value for the equilibrium internuclear distance Cu-Cl is deduced: r e (Cu-Cl) ϭ 0.20341(3) nm. The energy diagram of vibronic levels in the ground state is plotted up to 4000 cm Ϫ1 .

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