Table Info

Constant	Symbol	Silver	Gold
Mean free path for free electrons	l	52 nm	42 nm
Plasma frequency	ω_P	2.14 × 10¹⁵ Hz	2.17 × 10¹⁵ Hz
Fermi velocity	v_F	1.39 × 10⁶ m/s	1.39 × 10⁶ m/s
Constant parameter	A	1	0.33
Density	ρ	10.49 g/cm³	19.32 g/cm³

Declarations

Author contributions

HN: Conceptualization (outline of the research topic and the title of the article, suggesting the addition of Mie theory), Investigation (performing experimental work and preparing TEM images), Visualization (adding Figures 1 to 5). HM: Writing—original draft (completing the article), Visualization (preparing Figures 6 to 11), Methodology (presenting a new theory for calculating the mean free path based on Figure 6), Conceptualization (conceptual investigation of the problem), Formal analysis (adding equations 7 to 10 to the article).

Conflicts of interest

Both authors declare that they have no conflicts of interest.

Ethical approval

Not applicable.

Consent to participate

Not applicable.

Consent to publication

Not applicable.

Availability of data and materials

The data is available from the corresponding author upon reasonable request.

Funding

Not applicable.

Copyright

References

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