Volume Dependence of Raman Frequencies in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>α</mml:mi></mml:math>-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">N</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

The volume dependence of the Raman frequencies ${\ensuremath{\omega}}_{i}$ in $\ensuremath{\alpha}$-${\mathrm{N}}_{2}$ has been measured yielding the following values of the Gr\"uneisen parameter ${\ensuremath{\gamma}}_{i}\ensuremath{\equiv}\ensuremath{-}\frac{\ensuremath{\partial}\mathrm{ln}{\ensuremath{\omega}}_{i}}{\ensuremath{\partial}\mathrm{ln}V}$ at 8\ifmmode^\circ\else\textdegree\fi{}K: 2.09\ifmmode\pm\else\textpm\fi{}0.12, 1.74\ifmmode\pm\else\textpm\fi{}0.10, and 1.70\ifmmode\pm\else\textpm\fi{}0.10, where $i$ refers to the ${E}_{\mathrm{g}}$, low-frequency ${T}_{\mathrm{g}}$, and high-frequency ${T}_{\mathrm{g}}$ modes, respectively. These values are insensitive to temperature within experimental errors. The broad feature between 70 and 100 ${\mathrm{cm}}^{\ensuremath{-}1}$ is identified as a two-libron band.

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