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Abstract
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More recently, Khalilpour in his paper [Phys. Pl asmas 22, 122112 (2015)] has studied the
dispersion relation for propagation of surface waves in a half-space quantum plasma using a hydrodynamic model including the electron exchange-correlation effect, which he calls the modified
quantum hydrodynamic model. While this paper looks similar to the previously published one [M.
Shahmansouri, Phys. Plasmas 22, 092106 (2015)] in structure, the only difference appears to be
inclusion of the recently suggested kinetic factor of c ¼ 1 =9 for the quantum Bohm potential. In
this comment, we would like to clarify the application of the mentioned factor in the standard quantum hydrodynamic model and stress out that the so-called modified quantum fluid model does not
exist and the current extension of author is meaningless in the context of quantum hydrodynamics.
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