Splitting of v2 vibrational mode of CO2 isotopic species in the unstable trapping site in argon matrix P. R. Dahoo, I. Berrodier, V. Raducu, J. L. Teffo, H. Chabbi, A. Lakhlifi and L. Abouaf-Marguin Eur. Phys. J. D, 5 1 (1999) 71-81 Published online: 15 January 1999 DOI: 10.1007/s100530050231