Spectroscopic investigations of (\mathrm{CuCl}{2}) in its electronic ground state have been extended to transitions to the levels of the (\left(02^{\prime} 0\right)) vibronic multiplet. These transitions appear as weak (P, R) rotational lines in laser-induced fluorescence spectra recorded in the range (15850-15950 \mathrm{~cm}^{-1}). A single-mode ring dye laser, whose wavenumber was set near (16100 \mathrm{~cm}^{-1}), excited a transition in the ({ }^{2} \mathrm{II}{u(3 / 2)}\left(v^{\prime}\right) \leftarrow \dot{X}^{2} \mathrm{II}{g(3 / 2)}(000)) band, where (v^{\prime}) is at present an unidentified level of the ({ }^{2} \mathrm{II}{u}) state. After treatment of rotational perturbations in the upper state. a model has been constructed for calculating these fluorescence lines, based on the effective Hamiltonian of D. R. Woodward, D. A. Fletcher. and J. M. Brown (Mol. Phys. 62, 517-536, 1987;68, 261-262, 1989) for the ground state. The model was used to fit to 228 recorded lines with a nonlinear leastsquares program; it reproduces the rotational structure ( (\left.61 / 2 \leqslant J^{\prime \prime} \leqslant 801 / 2\right)), and the RennerTeller and (K)-doubling patterns appearing in this band with a root-mean-square error of 0.010 (\mathrm{cm}^{-1}), which is comparable with the experimental accuracy. Effective values (in (\mathrm{cm}^{-1}) ) have been obtained for the vibrational energy of the (020) level (\left(G_{2}=189.19(3)\right)), for rotational and centrifugal distortion constants (\left(B_{2}=5.5221(1) \times 10^{-2}\right.) and (\left.D_{2}=7.0(2) \times 10^{-9}\right)). for the (A) - and (K)-doubling constants (\left(q_{2}=-3.1(35) \times 10^{-5}, p_{2}=0.0721(9)\right.), and (\left.q_{v}=-1.1 \times 10^{-4}\right)), the Renner constant (\left(\epsilon \omega_{2}=-40.60(4)\right)) and the vibronic constant (\left(g_{K}=9.877(8)\right)) for the (\Omega=3 / 2) spin-orbit component. ici 1995 Academic Press, Inc.