Metastable Ions Formed by Electron Impact in Hydrocarbon Gases

Hipple, J. A.; Fox, Ronald F.; Condon, E. U.

doi:10.1103/physrev.69.347

Cited by 167 publications

(20 citation statements)

References 10 publications

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“…These experimental findings demonstrate that anion fragmentation is very slow. At low energies (the exact upper limit also depends upon the particular instrumental conditions) it is thus possible to describe these processes in the framework of a statistical approximation [32][33][34]. NIs which dissociate inside the ion source, but after a time much longer than a nuclear vibrational period, are detected as "normal" species.…”

Section: Discussion Of Anion Decay Kineticsmentioning

confidence: 99%

Temporary anion states and dissociative electron attachment to nitrobenzene derivatives

Asfandiarov

Pshenichnyuk

Lukin

et al. 2007

International Journal of Mass Spectrometry

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Section: Discussion Of Anion Decay Kineticsmentioning

confidence: 99%

Temporary anion states and dissociative electron attachment to nitrobenzene derivatives

Asfandiarov

Pshenichnyuk

Lukin

et al. 2007

International Journal of Mass Spectrometry

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“…A possible example of this behaviour is to be found in the ratio ml*/m,* for the reactions of [C3H70]+ ions derived from diethyl ether. [ (2). This pair of competing reactions is discussed further in the section on Gaussian metastable peaks; as will be seen, the system is indeed complex.…”

Section: (2) Experimental Conditionsmentioning

confidence: 94%

The scope of metastable peak observations

Holmes

Terlouw

1980

Org. Mass Spectrom.

251

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This short review focuses attention upon the present status of metastable ion studies with emphasis upon the relationship between metastable peak shapes, ion structures and fragmentation mechanisms. Some recommendations are made concerning nomenclature and the reporting of observations on Gaussian-type metastable peaks. Experimental methods for recording relative abundances of metastable peaks are critically appraised. The relationship between metastable ion phenomena and isomerization of gaseous ions is reviewed with particular attention drawn to the effect of rate-determining isomerizations. The shapes of Gaussian-type metastable peaks are discussed in some detail and selected examples from recent studies are used to show that such peaks may, by appropriate experiments, be separated into two Gaussian-type components thus revealing new features of the fragmentation reaction. The magnitude and significance of released kinetic energies, T, are considered and it is stated that few conclusions can be drawn from the evaluation of T alone; the importance of accurate thermochemical data as an aid to understanding and interpreting kinetic energy release data is emphasized. Other topics discussed include composite metastable peaks, metastable peaks produced in chemical ionization and field ionization and the partitioning of internal energy of the fragmenting ion into translational degrees of freedom of the products, for reactions with and without a reverse energy barrier.

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“…The probability of removing two dell teriums rather than a deuterium and a protium from B 2D 4H + is 3 j4 X 4 j5=3 /5 , and one would predict a pattern coefficient of 14 compared with 18 observed. Similarly, for B2DI-:I+ one would predict 0.4 X 66.9 = 27 instead of 29 , and for BDH+, 8.8 instead of 10. For B 2H + one would expect 0.9 instead of zero, and for BH+, 2.4 as observed.…”

Section: Discussionmentioning

confidence: 99%

Mass spectra of diborane-d6 and ethane-d6

Dibeler¹,

Mohler²,

Williamson³

1950

J. RES. NATL. BUR. STAN.

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The comple te mass spectra of B2D6 and C2D6 and t he partial spectrum of B2DSH h ave been obtained for ioni zin g voltages of 50 volts and 70 volts. An analytical procedure is given for deriving the contribu tion of all ions containing a hydrogen atom from the polyisotopic spectrum of a m ixture of B2D6 and B2DsH . A comparison of spectra of B2D6 and B2H6 and of C2D6 an d C2H6 indi cates that substitution of deuterium for hydrogen has only a sli gh t effect on t he di ssociation probabilities in dibor ane and ethane. An excep tion is t he occurren ce of a metastable t ran it ion in B2D6 that does not occur in B2Hij viz B2DS+ ...... B2D3++ 2D .S im ple statistical consid erations, based upon the assumption of equal probabi lities for t he removal of a deuterium or a protium , g ive a di ssociatio ll pattern that differs by more t han experimental error fr om th at observed .

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Metastable Ions Formed by Electron Impact in Hydrocarbon Gases

Cited by 167 publications

References 10 publications

Temporary anion states and dissociative electron attachment to nitrobenzene derivatives

Temporary anion states and dissociative electron attachment to nitrobenzene derivatives

The scope of metastable peak observations

Mass spectra of diborane-d6 and ethane-d6

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