Knowledge Bank

Emission lifetimes have been measured for almost all of the bound vibrational bands of the $A0\mathrm{<mrow\; data-mjx-texclass="ORD">1</mrow>}$ state of $C2N2$. They range from $1.3\mu s$ for the $41\mathrm{<mrow\; data-mjx-texclass="ORD">0</mrow>}$ band to $0.6\mu s$ for the $40\mathrm{<mrow\; data-mjx-texclass="ORD">1</mrow>}$ band. Self-quenching rate constants range from gas kinetic $(4.3\times 1010cm3/molecule-s)$ for the $40\mathrm{<mrow\; data-mjx-texclass="ORD">1</mrow>}$ to $13.0\times 10-10cm3/molecule-s$ for the $10\mathrm{<mrow\; data-mjx-texclass="ORD">1</mrow>}40\mathrm{<mrow\; data-mjx-texclass="ORD">1</mrow>}$ band. In addition, foreign quenching rates have been measured for most of the bands. We used $He,Ar,N2$ and $CH4$. The quenching rates from the foreign gases were less than the respective self-quenching rates and with an increasing trend with respect to increasing molecular structure. We are currently acquiring dispersed fluorescence spectra and high resolution excitation spectra for some of the strong bands of $C2N2$.