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Volumn 115, Issue 25, 2011, Pages 7378-7391

Dielectron attachment and hydrogen evolution reaction in water clusters

Author keywords

[No Author keywords available]

Indexed keywords

EXCESS ELECTRONS; FIRST-PRINCIPLES SIMULATIONS; HYDROGEN EVOLUTION REACTIONS; HYDROGEN MOLECULE; NANO-SIZE; SPIN-DENSITY-FUNCTIONAL THEORY; VALENCE ELECTRON; VERTICAL DETACHMENT ENERGIES; WATER CLUSTER; WATER DROPLETS; WATER MOLECULE;

EID: 79959548101     PISSN: 10895639     EISSN: 15205215     Source Type: Journal    
DOI: 10.1021/jp201560n     Document Type: Article
Times cited : (38)

References (88)
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    • Alternative decay channels of the doubly-charged clusters include (i) single electron emission (note the calculated low values for the first vertical detachment energies), VDE(1), and (ii) the DEHE reaction on which we focus in this study
    • Alternative decay channels of the doubly-charged clusters include (i) single electron emission (note the calculated low values for the first vertical detachment energies), VDE(1), and (ii) the DEHE reaction on which we focus in this study.
  • 73
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    • To account for the estimated experimental thermal conditions (that is, several tens of degrees Kelvin, see Experimental Section), the information that we give for the singly- and doubly-charged clusters (see text and Figure 3) was obtained from simulations where in the final stage of preparation (for details, see Appendix A) the clusters were cooled to 50 K and dynamically evolved using the FPBOMD method (see ref 41) for up to 5 ps. Simulations where the clusters were allowed to evolve at higher temperatures (200-250 K) yielded similar results pertaining to energetics (in particular, average vertical detachment energies) but with larger fluctuations and somewhat smaller radii of gyration (particularly for the singly-charged clusters); in this context, see theoretical discussions of preparation and thermal effects in refs 11d, 11e, 18c, and 20a
    • To account for the estimated experimental thermal conditions (that is, several tens of degrees Kelvin, see Experimental Section), the information that we give for the singly- and doubly-charged clusters (see text and Figure 3) was obtained from simulations where in the final stage of preparation (for details, see Appendix A) the clusters were cooled to 50 K and dynamically evolved using the FPBOMD method (see ref 41) for up to 5 ps. Simulations where the clusters were allowed to evolve at higher temperatures (200-250 K) yielded similar results pertaining to energetics (in particular, average vertical detachment energies) but with larger fluctuations and somewhat smaller radii of gyration (particularly for the singly-charged clusters); in this context, see theoretical discussions of preparation and thermal effects in refs 11d, 11e, 18c, and 20a.
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    • Other attachment modes that we have explored include (a) a higher (total) energy surface state where both electrons are bound in a common surface cavity, characterized by a very diffuse electron distribution (similar in appearance to that shown here for the one-electron diffuse sd state, see Figure 3 F) with one of the excess electrons having a negative VDE and (b) an even higher (total) energy state with one electron localized internally and the other bound at the surface
    • Other attachment modes that we have explored include (a) a higher (total) energy surface state where both electrons are bound in a common surface cavity, characterized by a very diffuse electron distribution (similar in appearance to that shown here for the one-electron diffuse sd state, see Figure 3 F) with one of the excess electrons having a negative VDE and (b) an even higher (total) energy state with one electron localized internally and the other bound at the surface.
  • 79
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    • note
    • 2O molecule at the apex of the pyramide), we find for the four water molecules in the base, 〈 d (O -O)〉 = 2.68 Å, Δ(O -O) = 2.59-2.85 Å; 〈 d (O -H)〉 = 1.67 Å; Δ(O -H) =1.56-1.89 Å, 〈 d (O-O)〉 = 3.73 Å and Δ(O-O) = 3.31-4.13 Å, and 〈 d (O′-O)〉 = 4.32 Å, Δ(O′-O) = 3.5-5.4 Å; the somewhat larger ranges of distance variations for structure II indicate some deviation from planarity (as described above), which is obvious from inspection of the shown structure. For the water molecule above the plane in structure II, we find d (O -O′) = 3.08 Å and d (H -O′) = 2.15 Å (where H* is the hydrogen atom of the hydroxide anion).
  • 82
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    • note
    • 2O miss (each) an H-acceptor molecule.
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.