Unimolecular dissociation of metastable excited states of (O,),,-\* into (02);-l cluster anions has been detected and studied quantitatively for n in the range of 13 to 22. The apparent metastable (decay rates determinedincrease with cluster size in from -5000 s-l (for n = 13) up to-8 5 0 0 ~-~ for
Unimolecular metastable decay of molecular clusters ions via monomer-fragment ejection: [(O2)n]−*→[(O2)n−1O]−+O
✍ Scribed by D. Margreiter; G. Walder; Z. Herman; T.D. Märk
- Publisher
- Elsevier Science
- Year
- 1990
- Tongue
- English
- Weight
- 511 KB
- Volume
- 167
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
The stability of ( 02); ions produced by electron attachment to a neutral cluster beam has been studied with a double-focusing sector field mass spectrometer. Besides monomer evaporation via metastable dissociation reactions (Oz);*-(Oi);?, t O2 it was possible to observe for the fint time metastable cluster ion dissociations via ejection of a monomer-fragment, i.e. [ (Oi).]-*-[ (02)._,0] -to. Mechanism, dynamics and energetics of this reaction are presented and discussed.
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## Abstract For Abstract see ChemInform Abstract in Full Text.
The mechanism of [ H, C, N] loss from metastable molecular ions of benzyl cyanides containing an F, CI, CF, , CH,, HO or CH,O substituent was investigated by deuterium and I3C labelling. The elimination of [H, C, N] from the metastable molecular ions of benzyl cyanides substituted with F, CI or CF,
The decomposition of metastable (Nz):', ((N,),Oz) +\* and (0,):' Ions (n up to 10) has been studied quantitatively with a double-focusing sector field mass spectrometer as a function of cluster size n, and the number of evaporated neutral monomers p (with p up to n -1 for each cluster ion series).
The rate constants for collisional quenching of Oz(b 'x:) by COz, NzO. NO, NHs\_ HCl and SOz. and of Oz(a '+.I by NO. NH3 and HCl have been measured at room tempera& by studying 'he emissions of singlet moleculx a\pg.en at 762 and 634 nm in D flowing discharge. The rate constant for deactivation of