Journal of Physical Studies 17(3), Article 3601 [9 pages] (2013)
DOI: https://doi.org/10.30970/jps.17.3601

THE PROPERTIES OF A TWO-PHASE FLUID OF TWO-LEVEL ATOMS TAKING INTO ACCOUNT SHORT-RANGE ORDER

V. M. Myhal¹, O. V. Derzhko^{2,1,3}
^{1}Ivan Franko National University of Lviv, Department for Theoretical Physics,
12 Drahomanov St., UA--79005, Ukraine
^{2}Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine,
1 Svientsitskii St., Lviv, UA--79011, Ukraine
^{3}Abdus Salam International Centre for Theoretical Physics,
11 Strada Costiera, Trieste, I--34151, Italy

The suggested earlier theory of nonuniform fluid of two-level atoms [J. Phys. Studies {\bf 1}, 402 (1997); J. Phys. Studies {\bf 9}, 156 (2005)] has been improved by taking into account the short-range order owing to short-range interactions. The changes in the vapour-liquid phase diagram, the density profile for planar interface, as well as the surface tension which are conditioned by going beyond a simple mean-field approximation are studied.

PACS number(s): 64.70.Fx, 82.65.Dp, 62.60Nh, 64.60.Qb