On the collisional cooling of co-trapped atomic and molecular ions by ultracold atoms: Ca+ + Na and Na2 +(v*,J* ) + Na.

Smith, W. W., Babenko, E., Cote, R., & Michels, H. H. (2003). On the collisional cooling of co-trapped atomic and molecular ions by ultracold atoms: Ca+ + Na and Na2 +(v*,J* ) + Na. In Coherence and Quantum Optics VIII (pp. 623–624). Springer US. https://doi.org/10.1007/978-1-4419-8907-9_199