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Understanding the factors influencing the lifetime of electronic states inartificial quantum structures is of great significance for advancing quantumtechnologies. This study focuses on CO-based quantum corrals on Cu(111).Tunneling spectroscopy measurements reveal a strong correlation between thesize of the quantum corral and spectral width, characterized by a predominantGaussian line shape. We attribute this dominant Gaussian-shaped lifetimebroadening to the interaction of surface state electrons with the corralboundary. To further investigate this phenomenon, we constructed corrals ofvarying wall densities. Our findings indicate that elastic processes, such astunneling, are more sensitive to wall density than coupling to the bulk.

Unexpected Gaussian line shapes reveal electron-adsorbate interaction as dominant broadening mechanism in quantum corrals