Knowledge Bank

Experimental resuIts concerning the self-broadening of about 100 lines in the $\nu 1+\nu 3$ band of $SO2$ near 2499$cm-1$ will be presented. The experiments were carried out with a tunable diode laser spectrometer in pulsed mode. The dependence of the broadening coefficient on the rotational quantum number $J\prime \prime$ and $Kua$ will be presented together with the comparison to our former results concerning the $\nu 1$ and $\nu 3$ band, respectively. In the studied quantum number range $2\le J\prime \prime \le 47.0\le Ka\prime \prime \le 13$ we observe similar to the other bands a pronounced $Ka\prime \prime$ dependence but only a weak $J\prime \prime$ dependence. The investigations are completed by measurements with the perturbers He, Ne, Ar, Kr, Xe, $N2$, $O2$, $H2$, and $D2$ for some selected lines.