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Volumn 109, Issue 26, 2005, Pages 5801-5813

Electron attachment step in electron capture dissociation (ECD) and electron transfer dissociation (ETD)

Author keywords

[No Author keywords available]

Indexed keywords

CLEAVAGE; ELECTRON CAPTURE DISSOCIATION (ECD); ELECTRON TRANSFER DISSOCIATION (ETD); POSITIVE SITES;

EID: 22344449081     PISSN: 10895639     EISSN: None     Source Type: Journal    
DOI: 10.1021/jp050218d     Document Type: Article
Times cited : (95)

References (50)
  • 7
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    • note
    • 3 is less exothermic by an amount equal to the electron affinity (EA) of the A species.
  • 8
    • 0035857240 scopus 로고    scopus 로고
    • Much of the pioneering work aimed at understanding the mechanising) by which ECD operates has been reported in refs 1 and by the Turecek group. See, for example: (a) Syrstad, E. A.; Turecek, F. J. Phys. Chem. A 2001, A105, 11144-11115.
    • (2001) J. Phys. Chem. A , vol.A105 , pp. 11144-111115
    • Syrstad, E.A.1    Turecek, F.2
  • 13
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    • (f) Syrstad, E. A.; Truecek, F. Am. Soc. Mass. Spectrom. 2004, 16, 208-224. (This latter paper contains the most up-to-date discussion of the mechanism of Scheme 1b.)
    • (2004) Am. Soc. Mass. Spectrom. , vol.16 , pp. 208-224
    • Syrstad, E.A.1    Truecek, F.2
  • 15
    • 22344455455 scopus 로고    scopus 로고
    • note
    • Rydberg states of high principal quantum number are known to have long lifetimes and large radial extents.
  • 19
    • 0346947012 scopus 로고    scopus 로고
    • (a) Sawicka, A.; Skurski, P.; Hudgins, R. R.; Simons, J. J. Phys. Chem. B 2003, B107, 13505-13511. (We should note that, later, in ref 5, Uggerud also considered the possibility of direct electron attachment to SS bonds.)
    • (2003) J. Phys. Chem. B , vol.B107 , pp. 13505-13511
    • Sawicka, A.1    Skurski, P.2    Hudgins, R.R.3    Simons, J.4
  • 21
    • 22344456185 scopus 로고    scopus 로고
    • note
    • 2 species interacting with the positive site(s).
  • 30
    • 0000478697 scopus 로고
    • This level of theory has been used successfully in the classic studies of dissociative electron attachment and through-bond electron transfer of, for, example, Jordan, K. D.; Paddon-Row, M. N. Chem. Rev. 1992, 92, 395-410.
    • (1992) Chem. Rev. , vol.92 , pp. 395-410
    • Jordan, K.D.1    Paddon-Row, M.N.2
  • 33
    • 22344435347 scopus 로고    scopus 로고
    • note
    • An analogous discussion could be made comparing the C=O π* orbital's attraction and that of a positive site elsewhere in a peptide or protein.
  • 35
    • 22344446115 scopus 로고    scopus 로고
    • note
    • As will become clear soon, most of the energy available in the collisions that we are studying will come from converting the cation-anion Coulomb attraction energy to relative translational energy. The initial internal vibrational-rotational energy of the cation or anion will be a small fraction of the total energy and can therefore be ignored.
  • 40
  • 41
    • 22344442505 scopus 로고    scopus 로고
    • note
    • 1,2.
  • 42
    • 22344447681 scopus 로고    scopus 로고
    • note
    • Electron-cation and anion-cation collision cross sections are usually considerably greater than, for example, gas-kinetic cross sections, especially when the relative kinetic energies are low. It is the effect of the long-range Coulomb attractive potentials that makes these collision cross sections so large.
  • 43
    • 22344437025 scopus 로고    scopus 로고
    • note
    • + sites are separated by more rigid units than methylene groups, so one could be more confident about knowing the distance between these two sites.
  • 44
    • 22344434622 scopus 로고    scopus 로고
    • note
    • The radial sizes of orbitals vary inversely as the square root of their electron binding energies. Because the Rydberg and σ* binding energies differ by a factor of 2, the radial sizes of the corresponding orbitals will be similar.
  • 46
    • 22344456318 scopus 로고    scopus 로고
    • note
    • We choose this electron energy because it is characteristic of the low-energy ECD experiments to which we are trying to relate.
  • 48
    • 0035860864 scopus 로고    scopus 로고
    • -1/2. Therefore, for electrons that have kinetic energy in the 0.1 -eV range, as we are considering here, the cross section is expected to be somewhat larger than that stated here.
    • (2001) J. Phys. B , vol.B34 , pp. 3855-3878
    • Klar, D.1    Fabrikant, I.2    Hotop, H.3
  • 50
    • 0034630936 scopus 로고    scopus 로고
    • These values are obtained by simply adding the unscreened Coulomb potentials of the two positive sites at the center of the S-S or C=O bond. We have shown (for example, see Skurski, P.; Simons, J.; Wang, X.-B.; Wang, L.-S. J. Am. Chem. Soc. 2000, 122, 4499-4507) that there is little, if any, dielectric screening produced by bonds within a molecule. The dielectric screening would be substantial if the molecule were surrounded by a bulk material that has a significant dielectric constant.
    • (2000) J. Am. Chem. Soc. , vol.122 , pp. 4499-4507
    • Skurski, P.1    Simons, J.2    Wang, X.-B.3    Wang, L.-S.4


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.