Metastable ion studies. IX—Thermochemistry and ion structures among fragmentating  ions, an electron impact and field ionization investigation

Holmes, John L.; Weese, Gwynneth M.; Blair, A. S.; Terlouw, J. K.

doi:10.1002/oms.1210120704

Cited by 23 publications

(4 citation statements)

References 21 publications

(4 reference statements)

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“…Other examples of mechanistic studies involve reactions whose KERs are bimodal30 such as the iodine atom loss from iodotoluenes, C 7 H 7 I + → C 7 H 7 + + I. The relative contributions of the low‐ and high‐KER components to the metastable peaks was observed to be time dependent 31.…”

Section: Ion Structure Determination and Reaction Mechanismsmentioning

confidence: 99%

Kinetic energy release distributions in mass spectrometry

2001

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Kinetic energy releases (KERs) in unimolecular fragmentations of singly and multiply charged ions provide information concerning ion structures, reaction energetics and dynamics. This topic is reviewed covering both early and more recent developments. The subtopics discussed are as follows: (1) introduction and historical background; (2) ion dissociation and kinetic energy release: kinematics; potential energy surfaces; (3) the kinetic energy release distribution (KERD); (4) metastable peak observations: measurements on magnetic sector and time-of-flight instruments; energy selected results by photoelectron photoion coincidence (PEPICO); (5) extracting KERDs from metastable peak shapes; (6) ion structure determination and reaction mechanisms: singly and multiply charged ions; biomolecules and fullerenes; (7) theoretical approaches: phase space theory (PST), orbiting transition state (OTS)/PST, finite heat bath theory (FHBT) and the maximum entropy method; (8) exit channel interactions; (9) general trends: time and energy dependences; (10) thermochemistry: organometallic reactions, proton-bound clusters, fullerenes; and (11) the efficiency of phase space sampling.

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Section: Ion Structure Determination and Reaction Mechanismsmentioning

confidence: 99%

Kinetic energy release distributions in mass spectrometry

2001

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“…for all the alkene isomers,7 and the metastable peak shapes are the same for a number of decompositions. 8 The translational energy released during the formation of [C3H5]+ in the EI source (i.e. faster decomposition) is, however, larger with 2-methylpropene than with but-lene.…”

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confidence: 99%

Unimolecular decomposition in the picosecond time-frame following field ionization of acyclic C4H8 alkenes

Morgan¹,

Derrick²,

Loudon³

1979

J. Chem. Soc., Perkin Trans. 2

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The kinetics of decomposition of 2Hand l3C-labeIled but-l -ene and 2-methylpropene and 2H-labelled cis-but-2-ene following field ionization have been determined in the picosecond time-frame. Mechanisms are proposed to account for the major decomposition processes. Carbon randornization in the [but-1 -enel+' ion is a relatively slow process, and it is suggested that this fact could be due to slow vibrational relaxation.

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“…An orbital interaction of 0.29 eV is not inconsequential, and approximates that calculated in like fashion for 13. 21 The interaction energies for the endocyclic analogues 1447 and 1548 are expectedly higher, The UV absorption spectra of MBN and MeBN are presented in Figure 4 (Results). There is a small (~2 nm) bathochromic shift of the B2u band and some diminution of intensity upon introduction of the double bond.…”

Section: Spectroscopy Of Mbn a Absorption And Fluorescencementioning

confidence: 99%