Knowledge Bank

In this talk we report our study of $\mathrm{<mrow\; data-mjx-texclass="ORD">12</mrow>}C2H4$ monomer and its clusters in $\mathrm{<mrow\; data-mjx-texclass="ORD">4</mrow>}He$ with the new, ""second generation"" helium droplet/infrared spectroscopy apparatus at UNC. The region containing the $\nu 11$ and $\nu 9$ asymmetric C-H stretches of the monomer was scanned using a tunable, cw OPO aligned collinearly with the droplet beam and detected with a quadrupole mass spectrometer. Rotationally resolved spectra were observed with line widths as narrow as $0.08cm-1$, FWHM. Details of the new instrument and the analysis of the spectra will be presented.