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Vibronic spectra of Gd^{3+} in Cs_{2}NaGdCl_{6} were measured under one- and two-photon excitations. Following the vibrational analysis of the Cs_{2}NaGdCl_{6} crystal an assignment of vibronic transitions was proposed. It was found that the vibronic transitions in one- and two-photon spectra are combined with the odd parity modes.