Tuning the scattering length on the ground triplet state of Cs2

We develop two schemes for tuning the scattering length on the ground tripletstate of Cs_2. First, an absolute value of the triplet scattering length of^{133}Cs_2 is determined using the experimental data (Fioretti et al,Eur.Phys.J. 5, 389 (1999)). We demonstrate that the large scattering length canbe made small and positive by coupling of the ^3\Sigma_u^+ (6S + 6S) potentialto the ^3\Pi_g state by strong off-resonant radiation. A weaker laser fieldcoupling the ^3\Sigma_u^+ (6S + 6S) continuum to the lowest bound level of theexcited ^3\Sigma_g^+ (6S + 6P) also leads to a small positive scatteringlength. In addition, the scattering length of the ^{135}Cs isotope is found tobe positive. The method used solves the Schroedinger equation for twoelectronic states coupled by an electromagnetic field with approximationsemployed. The scattering length is determined from calculated continuumwavefunctions of low energy.Comment: 4 figures, a discussion of influence of the C_6 coeficient on the scattering length of different isotopes is adde