Knowledge Bank

The Spectrum of acetylene between $5700-7100cm-1$ has been measured at pressure limited resolution at room temperature with a Bruker FTS 120HR and a White-type cell adjusted to provide pathlengths of 16--352m. Samples pressures used were 0.075--50 mbar. Spectral line position were determined relative the 3--0 band of $CO1$ known to an accuracy better than $0.0001cm-1$ over 30 bands of $\mathrm{<mrow\; data-mjx-texclass="ORD">12</mrow>}C2H2$ and $\mathrm{<mrow\; data-mjx-texclass="ORD">13</mrow>}C13CH3$ have been identified. Pertubations have been taken into account I the analysis. The molecular parameters determined considerably improve our knowledge of the $spectrum.a$ The current interest of acetylene studies in this spectral region is evident from the information available in the report of Kou et $al.b$ and the recent photoacoustic measurement of Dermtr""{o}der, et $al.c$ The present study include region not covered by Guelachvili and $Rao.d$ The spectrum will be presented and the results discussed.