M. Botti and S. Moroni. J. Chem. Phys., 125, 144310 (2006). M. Hartmann, R. E. Miller, J. P. Toennies and A. F. Vilesov, Phys. Rev. Lett. 75, 1566 (1995).

\(a) Y. Kwon, P. Huang, M. V. Patel, D. Blume and K. B. Whaley. J. Chem. Phys., 113, 6469 (2000).

\(b) Y Kwon and K.B. Whaley, J. Chem. Phys.119, 1986 (2003) 10p

C. Callegari, Molecular Rotation and Dynamics in Superfluid $^4$He Nanodroplets, Ph.D thesis, Princeton University, 2000.

S. Moroni, A. Sarsa, S. Fantoni, K. E. Schmidth and S. Baroni. Phys. Rev. Lett., 90, 143401 (2003).

F. Paesani, A. Viel, F. A. Gianturco and K. B. Whaley. Phys. Rev. Lett., 90, 073401 (2003).

S. Paolini, S. Fantoni, S. Moroni and S. Baroni. J. Chem. Phys., 123, 114306 (2005). F. Paesani and K. B. Whaley. J. Chem. Phys., 121, 4180 (2004). N. Blinov, X. Song and P. N. Roy. J. Chem. Phys., 120, 5916 (2004). R. E. Zillich, F. Paesani, Y. Kwon and K. B. Whaley. J. Chem. Phys., 123, 14301 (2005). S. Miura. J. Phys., 17, S3259 (2005). S. Miura. J. Chem. Phys., 126, 114309 (2007), and references therein .

J.O. Anderson, Rev. Mod. Phys. 76, 599(2004).

M.D. Tomchenko, Asian J. Phys. 