Structural evolution and stability of hydrogenated Li(n) (n = 1-30) clusters: a density functional study.

Area of Science:

• Computational materials science
• Quantum chemistry
• Solid-state physics

Background:

• Hydrogenated lithium clusters (Li(n)H(m)) are of interest for their unique structural and electronic properties.
• Understanding their behavior is crucial for developing new materials.

Purpose of the Study:

• To investigate the structural, electronic, and optical properties of Li(n)H(m) clusters.
• To determine the transition from 2D to 3D geometries and the effect of hydrogenation on stability.

Main Methods:

• Density Functional Theory (DFT) using the B3LYP functional and 6-311G++(d, p) basis set.
• Structural optimization and calculation of electronic and optical properties.

Main Results:

• A transition to 3D geometry occurs at n=4, m=3.
• Rock-salt-like FCC structure observed in Li(13)H(14).
• Lattice constants of saturated clusters approach bulk values (4.083) with increasing size.
• Hydrogenation significantly stabilizes clusters, especially when fully hydrogenated (m=n).

Conclusions:

• Sequential hydrogen addition stabilizes Li(n)H(m) clusters.
• Fully hydrogenated clusters exhibit enhanced stability due to favorable electronic and optical properties.
• The study provides insights into the structure-property relationships of hydrogenated lithium clusters.