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Citation: Jiang Bo*, Xie Jinchun, Sha Guohe, Xie Xinbing, Zhang Cunhao. OODR-MPI SPECTROSCOPY OF AMMONIA INVOLVING A FAST PREDISSOCIATING INTERMEDIATE STATE[J]. Acta Physico-Chimica Sinica, ;1989, 5(03): 293-298. doi: 10.3866/PKU.WHXB19890309 shu

OODR-MPI SPECTROSCOPY OF AMMONIA INVOLVING A FAST PREDISSOCIATING INTERMEDIATE STATE

1.
Dalian Institute of Chemical Physica; Academic Sinica

Received Date: 27 September 1987
Available Online: 15 June 1989

OOD-RMPI spectroscopy Of ammonia using the fast predissoeiating Ã state as the intermediate has proved to be a feasible approach to uncover hidden spectroscopic information on both the upper electronic states and the intermediate predissociating species. The rotationally resolved MPI spectra of NH_3 and ND_3 X→(2hν_1)Ã→(hν_2)C′transition and correspondingly the rotational constants of ND_3 C′ ~1A_1′(v_2=0,1) haStebeen obtained. We found that only Q branch lines of NH_3 X→Ã 2-photon transition appeared when linearly polarised pumping light was used. At a series of different v_1 frequences, we can always get 2v_1+v_2 resonant with a fixed X→C′rovibronic transition line by tunning v_2. The intensity envelope of the ion signal thus obtained represents the rotational line profile of Ã state. From the width of the profile predissociation life time of Ã is obtained.
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