Helium nanodroplets molecules

Macharov GN. (2004) Spectroscopy of single molecules and clusters inside helium nanodroplets. Microscopic manifestation of " He superfuhdity. Physics-Usbekhi 47 217-247. 

Choi MY, Douberly GE, Falconer TM, Lewis WK, Lindsay CM, Merritt JM, Stiles PL, Miller RE. (2006) Infrared spectroscopy of helim nanodroplets Novel methods for physics and chemistry. Int. Rev. Phys. Chem. 25 15-75. Szalewicz K. (2008) Interplay between theory and experiment in investigations of molecules embedded in superfluid helium nanodroplets. Int. Rev. Phys. Chem. 27 273-316. 

Barranco M, Guardiola R, Hernandez S, Mayol R, Navarrro J, Pi M. (2006) Helium nanodroplets An overview. J. Low. Temp. Phys. 142 1- 81. Grebenev S, Hartmann M, Havenith M, Sartakov B, Toennies JP, Vilesov AF. (2000) The rotational spectrum of single OCS molecules in hquid " He droplets. J. Chem. Phys. 112 4485-4495. 

The stability of the He atom is also responsible for an exceedingly weak van der Waals interaction with all other atoms and molecules. Not surprisingly the interaction potential of helium with most molecules are among the weakest of all atom-molecule partners. The van der Waals potential for interactions with alkali and alkali earth atoms are so weak that they cannot support a bound state. This explains why these are the only known surfaces which are not wetted by liquid helium. In connection with the nanodroplet experiments the interaction potentials also explain why virtually all atoms and molecules with the exception of the alkali and alkaline earth atoms are heliophilic, implying that they prefer to be submerged inside the liquid, whereas the alkali and alkaline earth atoms are heliophobic and remain on the surface. 

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