Sökning: WFRF:(Zappa F) >
Ionization of doped...
Ionization of doped helium nanodroplets : Complexes of C-60 with water clusters
-
Denifl, S (författare)
-
Zappa, F (författare)
-
Maehr, I (författare)
-
visa fler...
-
- Mauracher, Andreas (författare)
- Uppsala universitet,Strukturkemi
-
Probst, M (författare)
-
Urban, J (författare)
-
Mach, P (författare)
-
Bacher, A (författare)
-
Bohme, D.K. (författare)
-
Echt, O (författare)
-
Maerk, T.D. (författare)
-
Scheier, P (författare)
-
visa färre...
-
(creator_code:org_t)
- American Institute of Physics, 2010
- 2010
- Engelska.
-
Ingår i: Journal of Chemical Physics. - : American Institute of Physics. - 0021-9606 .- 1089-7690. ; 132:23, s. 234307-
- Relaterad länk:
-
http://apps.isiknowl...
-
visa fler...
-
https://urn.kb.se/re...
-
https://doi.org/10.1...
-
visa färre...
Abstract
Ämnesord
Stäng
- Water clusters are known to undergo an autoprotonation reaction upon ionization by photons or electron impact, resulting in the formation of (H2O)(n)H3O+. Ejection of OH cannot be quenched by near-threshold ionization; it is only partly quenched when clusters are complexed with inert gas atoms. Mass spectra recorded by electron ionization of water-doped helium droplets show that the helium matrix also fails to quench OH loss. The situation changes drastically when helium droplets are codoped with C-60. Charged C-60-water complexes are predominantly unprotonated; C-60(H2O)(4)(+) and (C-60)(2)(H2O)(4)(+) appear with enhanced abundance. Another intense ion series is due to C-60(H2O)(n)OH+; dehydrogenation is proposed to be initiated by charge transfer between the primary He+ ion and C-60. The resulting electronically excited C-60(+)* leads to the formation of a doubly charged C-60-water complex either via emission of an Auger electron from C-60(+)*, or internal Penning ionization of the attached water complex, followed by charge separation within {C-60(H2O)(n)}(2+). This mechanism would also explain previous observations of dehydrogenation reactions in doped helium droplets. Mass-analyzed ion kinetic energy scans reveal spontaneous (unimolecular) dissociation of C-60(H2O)(n)(+). In addition to the loss of single water molecules, a prominent reaction channel yields bare C-60(+) for sizes n=3, 4, or 6. Ab initio Hartree-Fock calculations for C-60-water complexes reveal negligible charge transfer within neutral complexes. Cationic complexes are well described as water clusters weakly bound to C-60(+). For n=3, 4, or 6, fissionlike desorption of the entire water complex from C-60(H2O)(n)(+) energetically competes with the evaporation of a single water molecule. (C) 2010 American Institute of Physics.
Ämnesord
- NATURVETENSKAP -- Kemi -- Oorganisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Inorganic Chemistry (hsv//eng)
Nyckelord
- ELECTRON-IMPACT IONIZATION
- ION-MOLECULE REACTIONS
- KINETIC-ENERGY RELEASE
- GAS-PHASE REACTIONS
- SYNCHROTRON-RADIATION; LIQUID-HELIUM
- AB-INITIO
- METASTABLE DECAY
- GLOBAL MINIMA
- MAGIC NUMBERS
- Inorganic chemistry
- Oorganisk kemi
- Kemi med inriktning mot oorganisk kemi
- Chemistry with specialization in Inorganic Chemistry
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
Hitta via bibliotek
Till lärosätets databas
- Av författaren/redakt...
-
Denifl, S
-
Zappa, F
-
Maehr, I
-
Mauracher, Andre ...
-
Probst, M
-
Urban, J
-
visa fler...
-
Mach, P
-
Bacher, A
-
Bohme, D.K.
-
Echt, O
-
Maerk, T.D.
-
Scheier, P
-
visa färre...
- Om ämnet
-
- NATURVETENSKAP
-
NATURVETENSKAP
-
och Kemi
-
och Oorganisk kemi
- Artiklar i publikationen
-
Journal of Chemi ...
- Av lärosätet
-
Uppsala universitet