Knowledge Bank

In some $Rg\cdot SH$ complexes (Rg = Ar and Kr), the natural lifetime of the $A¯$ state has remarkably lengthened compared with uncomplexed SH ($\tau =3$ ns for the $A2\Sigma \prime v=0$ level). We have $reported-1$ the natural lifetime of v, to $v,+4$ levels of $Ar\cdot SH$ to be 600, 543, 405, 158 and 49 ns where the absolute value of the vibrational quantum number v. has not yet been determined. In $Kr\cdot SH$, the natural lifetimes of different vibrational levels of the $A~$ state do not vary dramatically. All the measurements indicate the natural lifetime of the $A~$ state is about 600 ns. However, the natural lifetime of all observed $Ne\cdot SH$ bands are shorter than our instrumental limit (20ns). The details of the analysis and its physical interpretation will be discussed.