Document Type : Original Article

**Authors**

Persian Gulf University, Bushehr

**Abstract**

In this research, by assuming that the vacuum electric field fluctuations can convert a molecule (or an atom) into an oscillating electric dipole, the interaction potential of the two atoms or two non-polar molecules is calculated in terms of the molecular polarizabilities and the distance between them. Considering the net electric field at the position of a molecule as a sum of the vacuum electric field and the electric field due to the induced electric dipole of the other molecule, and substituting in the quadratic stark shift formula, the interaction potential of the two molecules is related to the vacuum electric field correlation function. By writing the interaction potential in terms of the imaginary parts of vector potential Green function tensor components (via the fluctuation- dissipation theorem and Kubo’s formula in statistical mechanics) and computing the required Green function components, the interaction potential between the two molecules is evaluated. The small and large distances limits of the general formula investigated and the consistencies with the previous works are shown.

**Keywords**

- P W Milonni, “
*The Quantum Vacuum*”,*Academic Press*, New York (1994). - W H Keesom, KNAW,
**18**(1915) - F London,
*Physik***63**(1930**)** - B R Holstein,
*J. Phys*.**69**(2001) 441. - H B G Casimir and D Polder,
*Rev.***73**(1948) 360. - D Kupiszewska and J Mostoveski,
*Rev*. A**41**(1990) 4636. - D Kupiszewska,
*Rev*. A**46**(1992) 2286. - F Kheirandish, M Soltani, and J Sarabadani,
*Phys***326**(2011) 657. - H Falinejad and F Bayat,
*J. Mod. Phys*. B**28**(2014) 1450232. - H Falinejad,
*Phys. J*. D**71**(2017) 165. - S M Barnett, B H Huttner and R. Loudon,
*Rev. Lett*.**68**(1992) 3698. - S M Barnett, B H Huttner, R Loudon, and R Matloob,
*Phys*. B**29**(1996) 3763. - A Tip,
*Rev*. A**56**(1997) 5022. - A Tip,
*Rev*. A**57**(1998) 4818. - H Falinejad and S Najafi Ardekani,
*Phys*. B**125**(2019) 208. - R Matloob,
*Rev.*A**62**(2000) 022113. - C C Gerry and P L Knight, “
*Introductory Quantum Optics*”, Cambridge University Press (2005) - E M Lifshitz,
*Phys, JEPT***2**, Part 1 (1956) 73 - Landau and E Lifshitz, “
*Statistical Physics Part*2”, Pergamum Oxford (1980). - J D Jackson, “
*Classical Electrodynamics*”, New York John Wiley and Son (1999).

** **

** **