Photofragment excitation spectra of roomhyphen;temperature HNF and DNF have been measured by monitoring laser fluorescence of the NH(Xthinsp;3Sgr;minus;) and ND(Xthinsp;3Sgr;minus;) fragments, respectively. These fragments were observed upon the excitation of the following parent moleculeAtilde;thinsp;2Arsquo;vibrational levels: HNF (0,v2rsquo;,0), withv2rsquo;= 3ndash;6; and DNF (0,v2rsquo;,0), withv2rsquo;= 5ndash;7, and (0,v2rsquo;,1), withv2rsquo;= 3 and 4. With the exception of the highest levels, the photofragment excitation spectra were found to have complicated structures which were drastically different and more complicated than theKstructure in the parent molecule absorption and fluorescence excitation spectra. The internal energy content of the fragments was also measured. For the lower HNF (DNF) levels the fragments possess very little rotational energy; for higher parent molecule levels the fragment rotational energy is correlated with the parent energy. The fragmentation of excited HNF (DNF) is complicated by the fact that there are three closehyphen;lying possible dissociation channels, to NH(Xthinsp;3Sgr;minus;)+F(2P), NF(Xthinsp;3Sgr;minus;)+H(2S), and HF(Xthinsp;1Sgr;+)+N(2D). These results on the photofragmentation of excited HNF (DNF) and other observations from this laboratory on the parent laser fluorescence spectrum and measured decay lifetimes are discussed.
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