\begin{table}%t1
\caption{\label{bandIRassignment}\mbox{a-C:H} vibrational assignments.}
\small
%%\centering

\par
\begin{tabular}{ccl}
\hline \hline\noalign{\smallskip}
Position $\sigma$ & Position $\lambda$ & Vibrational Mode\\
$(\rm cm^{-1})$ & ($\mu $m) & \\
\hline
3300 & 3.03 & alkyne  CH  stretching\\
3078 & 3.25 & olefinic CH$_{2}$ asymmetric stretching\\
3050 & 3.28 & aromatic CH stretching\\
3010 & 3.32 & olefinic CH  stretching\\
2955 & 3.38 & aliphatic  CH$_{3}$ asymmetric stretching\\
2925 & 3.42 & aliphatic  CH$_{2}$ asymmetric stretching\\
2870 & 3.48 & aliphatic  CH$_{3}$ symmetric stretching\\
2855 & 3.50 & aliphatic  CH$_{2}$ symmetric stretching\\
2100 & 4.76 & alkyne  CC  stretching\\
1900 & 5.26 &  C\ =\ C\ =\ C  stretching\\
1550--1650 & 6.0 -- 6.4 &  C\ =\ C  stretching\\
1450 & 6.89 & aliphatic CH$_{2}$ bending\\
1375 & 7.27 & aliphatic CH$_{3}$ symmetric bending\\
970 & 10.3 &  CH\ =\ CH  out of plane bending\\
890--910 & 10.9--11.2 &  CH\ =\ CH$_2$ out of plane bending\\
\hline
\end{tabular}
\end{table}