Table 1.

Some sets of the parameters ε ₀, ω _p, γ _bulk of the dielectric functions ε _Di(ω) (Eq. 2) reported in literature

	[5]	[11]	[44]	[51]	[52]	[53]	[54]
ε 0	1	9.84	9.5	1.53	8.5	1	1
γ bulk (eV)	0.026	0.072	0.06909	0.0729	0.0691	0.0184	0.07088
ω p (eV)	9.02	9.01	8.9488	8.55	8.9517	8.55	8.89