Thermodynamic properties of hydrated and ammoniated electrons

Lepoutre, G.; Jortner, Joshua

doi:10.1021/j100649a015

Cited by 39 publications

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“…This value seems reasonable if compared to literature values. With increasing cluster size, the EA is expected to asymptotically approach 1.65 eV which is the heat of solvation determined for the condensed phase hydrated electron [29]. Barnett et al [30,31] have reported a model which adapts a dielectric continuum framework in describing the size dependence of the EA's of neutral water clusters, and using their model we can estimate EA's of 0.73, 1.25, and 1.49 eV for n = 10 2 , 10 3 , and 10 4 , respectively.…”

Section: Discussionmentioning

confidence: 92%

Ionization of water clusters by collisions with graphite surfaces

Andersson

Pettersson

1997

Z Phys D - Atoms, Molecules and Clusters

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We present experimental results on the scattering of neutral water clusters from graphite surfaces. We use cluster beams with an average cluster size up to 3700 molecules and an incident velocity of 1300 m/s, and study the emission of negatively and positively charged cluster fragments from the surface. The ionization probability is found to depend on cluster size and surface temperature, and for a given mean cluster size the emission rate of positive and negative cluster ions follows the Arrhenius equation. In the surface temperature range 950-1450 K, activation energies of 0.52±0.02 and 3.1 ± 0.3 eV are determined for the emission of positive and negative ions, respectively. The emission of negative cluster fragments is attributed to electron transfer from the surface, and we estimate an electron affinity of 1.4 ± 0.3 eV for large water clusters. Positive cluster fragments are proposed to be formed by dissocative ionization inside the cluster, followed by removal of the negative ion during surface contact.

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Section: Discussionmentioning

confidence: 92%

Ionization of water clusters by collisions with graphite surfaces

Andersson

Pettersson

1997

Z Phys D - Atoms, Molecules and Clusters

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“…However, their calculated values of EA(n) appear to be overestimations, given that they are larger than the corresponding experimental VDE(n) values, and that their EA(n) values appear to be on a course that would overestimate EA(ϱ), i.e., the literature value of ⌬H s for bulk ammoniated electrons. 51,52 In subsequent work, these authors explain that such overestimations are expected within this model, since it uses only a pair-potential approximation, neglecting induced polarization which would serve to decrease the effective polarization. 17 Later, a refined dielectric sphere model was presented by Landman and co-workers, 15,16,[53][54][55] and also by Stampfli and Bennemann themselves.…”

Section: Discussionmentioning

confidence: 99%

Ammonia cluster anions and their relationship to ammoniated (solvated) electrons: The photoelectron spectra of (NH3)n=41–1100−

Sarkas¹,

Arnold²,

Eaton³

et al. 2002

The Journal of Chemical Physics

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A theoretical prediction on intermolecular monoelectron dihydrogen bond H e H in the cluster anion ( FH ) 2 {e}( HF ) 2We report the negative ion photoelectron spectra of (NH 3 ) nϭ41-1100 Ϫ , recorded using 2.540 eV photons. The largest cluster anion in this series has a diameter of approximately 4.3 nm. The vertical detachment energies ͑VDEs͒ of these cluster anions increase smoothly from 0.55 eV for nϭ41 to 1.05 eV for nϭ1100. The VDEs throughout this size range are linear with n Ϫ1/3 and extrapolate to a VDE (nϭϱ) value, which is very close to the measured photoelectric threshold energy of condensed phase ammoniated electrons. The linear extrapolation of this data to an analogous condensed phase property implies that these cluster anions are gas-phase counterparts to ammoniated electrons, i.e., they are embryonic forms of ammoniated electrons which will mature with increasing cluster size to become condensed phase-solvated electrons. The VDE data further implies that these embryonic ammoniated electrons were generated in solid ammonia environments, consistent with the source conditions under which they were produced.

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“…The EA a 's for the larger clusters are expected to approach 1.65 eV asymptotically; the limiting adiabatic value corresponds to ⌬H s , the heat of solvation for the condensed phase hydrated electron. 19,20 Barnett et al 21,22 have reported a model which adapts a dielectric continuum framework in describing the size dependence of the water cluster anion vertical detachment energies ͑VDE's͒ and the EA a 's of the neutral water clusters. The VDE's and the EA a 's are represented as follows:…”

Section: Discussionmentioning

confidence: 99%

Competition between electron detachment and monomer evaporation in the thermal destruction of hydrated electron clusters

Arnold¹,

Morris²,

Viggiano³

1995

The Journal of Chemical Physics

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Articles you may be interested inHydrogen detachment of the hydrated hydrohalogen acids upon attaching an excess electron On the origin of the competition between photofragmentation and photodetachment in hydrated electron clusters, (H2O)− n J. Chem. Phys. 91, 6536 (1989); 10.1063/1.457371 Photochemistry of hydrated electron clusters (H2O)− n (15≤n≤40) at 1064 nm: Size dependent competition between photofragmentation and photodetachment

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Thermodynamic properties of hydrated and ammoniated electrons

Cited by 39 publications

References 0 publications

Ionization of water clusters by collisions with graphite surfaces

Ionization of water clusters by collisions with graphite surfaces

Ammonia cluster anions and their relationship to ammoniated (solvated) electrons: The photoelectron spectra of (NH3)n=41–1100−

Competition between electron detachment and monomer evaporation in the thermal destruction of hydrated electron clusters

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