Isolated linear carbon chains (LCCs) encapsulated by multiwalled carbon nanotubes are studied under hydrostatic pressure ($P$) via resonance Raman scattering. The LCCs’ spectroscopic signature C band around $1850{\mathrm{cm}}^{-1}$ softens linearly with increasing $P$. A simple anharmonic force-constant model not only describes such softening but also shows that the LCCs’ Young’s modulus ($E$), Grüneisen parameter ($\gamma$), and strain ($ϵ$) follow universal $P^{-1}$ and $P^2$ laws, respectively. In particular, $\gamma$ also presents a unified behavior for all LCCs. To the best of our knowledge, these are the first results reported on such isolated systems and the first work to explore universal $P$-dependent responses for LCCs’ $E$, $ϵ$, and $\gamma$.

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• Anharmonic lattice dynamics
• Compressive strength
• Elasticity
• Mechanical & acoustical properties
• Pressure effects
• Stress
• 1-dimensional systems
• Lattice models in condensed matter
• Pressure techniques
• Raman spectroscopy