Observation of stimulated hyper-Raman scattering inH2

Abstract

Along with two-photon excitation of ${\mathrm{H}}_2$ (X->EF) stimulated electronic hyper-Raman scattering (SEHRS) is observed on four of seven two-photon resonances. The tunable Stokes transitions to B-state levels are in the range 750–840 nm. This is, to our knowledge, the first observation of SEHRS with a molecule. In addition, an unassigned stimulated line, redshifted by 26.7 ${\mathrm{cm}}^{\mathrm{-}1}$ relative to the EF(v’=6)->B(v’ ’=1) P(2) line, is observed. This transition entails four additional vacuum ultraviolet lines, blueshifted by the same amount relative to tabulated B→X transitions.