Knowledge Bank

Both 1- and 2-photon rotationally resolved spectra of the $S1\leftarrow S0$ transition in jet cooled trietilene- diammine (DABCO) were observed in the spectral region around 280nm. In addition to $e\prime$ modes, accessible by 1-photon ""perpendicular"" transition, and $a1\prime$ modes, by 2-photon ""parallel"" transition, we will present results on $a2\prime \prime$ modes, accessible by 1-photon ""parallel"" transition, and $a1\prime$ modes, accessible by 1-photon ""quadrupole"" transition.