Doppler-free two-photon resonances in theν2bands ofN14H3at high Stark fields

Additional two-photon resonances have been observed and identified in the ${\nu }_2$ bands of ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ ${\mathrm{H}}_3$ at high Stark fields with the Doppler-free technique. With an excitation energy of 1880.481 ${\mathrm{cm}}^{-1\mathrm{}}$ provided by two C${\mathrm{O}}_2$ 10.4-μm laser quanta [$P\left(14\right)\mathrm{}$ and $P\left(34\right)\mathrm{}$] the observed $({\nu }_2,J,K)\to (\nu _2^{}{}_{}{}^{\prime },J^{\prime },K^{\prime })$ resonances are identified as ($0^{+}$,4,4)→($2^{-}$,4,4) and ($0^{-}$,2,2)→($2^{-}$,2,2). Violation of the parity rule in the former case is induced by the static Stark field.