Direct Observation of NF(X) Using Laser Induced Fluorescence: Determination of H + NF(2) Branching Ratio
AEROSPACE CORP EL SEGUNDO CA LAB OPERATIONS
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For the first time, the branching ratio for the H NF2 has been measured using direct detection of the excited NF a1 delta and the ground NFX3 delta - states. NF a1 delta was observed by its emission at 874 nm from both the 249 nm photolysis of NF2 and from the reaction of H atoms produced from HBr photolysis at 193 nm with NF2. While NF X3 delta - was easily detected by laser induced fluorescence on the NF b1 delta - X3 delta - transition following 249 nm NF2 photolysis, it was no observed following the H NF2 reaction. This result leads to a lower limit for the NFa branching ratio, NFaNF sub tot 0.90 or - 0.03, in accord with previous results. The measured NF a1 delta quantum yield from KrF photolysis of NF2, ThetaNFa 0.04 or - 0.02 also agrees with prior work. The NF2 photolysis quantum yield is observed to be unity, based on results from an HC1 titration of the F atoms from the 249 nm photolysis of NF2.
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