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Abstract
In this work, it is demonstrated that a simple analytical expression, (A/R2) exp(-B/μ-μcr), where μ is the dipole moment, μcr is the critical dipole moment, and A and B are constants, accurately describes the binding energy of an electron in the field of a finite fixed dipole over a wide range of dipole moments. It is also demonstrated that this expression provides an accurate fit to the experimental electron binding energies for the dipole-bound anions of a series of phenoxy radicals. A simple extension of this expression is found to be applicable when the dipole model is extended to include short-range repulsion and polarization interactions.
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Examining Opioid-Dependent Chronic Pain Patients Experiences On Buprenorphine Maintenance Therapy In The Texas Workers Compensation System: Pilot Study - Part 2. VALUE IN HEALTH : THE JOURNAL OF THE INTERNATIONAL SOCIETY FOR PHARMACOECONOMICS AND OUTCOMES RESEARCH 2014; 17:A769-A770. [PMID: 27202827 DOI: 10.1016/j.jval.2014.08.308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
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3
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Assessment of the performance of common density functional methods for describing the interaction energies of (H2O)6 clusters. J Chem Phys 2010; 132:134303. [DOI: 10.1063/1.3373815] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Infrared Spectroscopy of Small Protonated Water Clusters, H+(H2O)n (n = 2−5): Isomers, Argon Tagging, and Deuteration. J Phys Chem A 2010; 114:4570-9. [DOI: 10.1021/jp100778s] [Citation(s) in RCA: 143] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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5
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Application of the Diffusion Monte Carlo Method to the Binding of Excess Electrons to Water Clusters. J Phys Chem A 2009; 114:1364-6. [DOI: 10.1021/jp9066108] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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Model systems for exploring electron correlation effects in the buckling of SiSi dimers on the Si(100) surface. Mol Phys 2008. [DOI: 10.1080/00268970802317504] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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9
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Infrared photodissociation spectroscopy of Mg(+)(H2O)Ar(n) complexes: isomers in progressive microsolvation. J Phys Chem A 2007; 109:7057-67. [PMID: 16834068 DOI: 10.1021/jp051877t] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Ion-molecule complexes of the form Mg(H2O)Ar(n)+ (n = 1-8) are produced by laser vaporization in a pulsed-nozzle cluster source. These complexes are mass-selected and studied with infrared photodissociation spectroscopy in the O-H stretch region. The spectra are interpreted with the aid of ab initio calculations on the n = 1-5 complexes, including examination of various isomeric structures. The combined spectroscopic and theoretical studies reveal the presence of multiple isomeric structures at each cluster size, as the argon atoms assemble around the Mg(+)(H2O) unit. Distinct infrared resonances are measured for argon-on-metal, argon-on-OH and argon-on-two-OH isomers.
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Molecular Dynamics Simulations of Methane Hydrate Using Polarizable Force Fields. J Phys Chem B 2007; 111:6486-92. [PMID: 17511493 DOI: 10.1021/jp068505k] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Molecular dynamics simulations of methane hydrate have been carried out using the polarizable AMOEBA and COS/G2 force fields. Properties calculated include the temperature dependence of the lattice constant, the OC and OO radial distribution functions, and the vibrational spectra. Both the AMOEBA and COS/G2 force fields are found to successfully account for the available experimental data, with overall somewhat better agreement with experiment being found for the AMOEBA model. Comparison is made with previous results obtained using TIP4P and SPC/E effective two-body force fields and the polarizable TIP4P-FQ force field, which allows for in-plane polarization only. Significant differences are found between the properties calculated using the TIP4P-FQ model and those obtained using the other models, indicating an inadequacy of restricting explicit polarization to in-plane only.
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Abstract
Adsorption structures of the dibenzo[a,j]coronene (C(32)H(16)) molecule on the clean Si(001)-2 X 1 surface were investigated by scanning tunneling microscopy (STM) in conjunction with electronic structure calculations. The dibenzo[a,j]coronene molecules were found to adsorb on three different sites: one major adsorption site and two minor adsorption sites. The formation of four to eight Si-C covalent bonds is responsible for the different surface bonding structures observed. Bond strain effects due to out-of-plane bending of the molecule play a significant role in governing the surface bond energies. The geometries of the three adsorption sites were established by comparison of the experimental and simulated STM images. By applying an electrical pulse, the molecule can be made to hop from one site to another site without breaking the dibenzo[a,j]coronene molecular structure.
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Abstract
The bending vibrational spectrum of the perdeutero isotopomer of the water trimer anion has been measured and compared with spectra calculated using the MP2, CCSD, and Becke3LYP electronic structure methods. Due to its low electron binding energy (approximately 150 meV), only the OD bending region of the IR spectrum of (D2O)3(-) is accessible experimentally, with electron ejection dominating at higher photon energies. The calculated spectrum of the isomer having three water molecules arranged in a chain agrees best with the experimental spectrum. In the chain isomer, the excess electron is bound to the terminal water monomer with two dangling OH groups. This is consistent with the electron binding mechanism established previously for the (H2O)n(-) (n = 2, 4-6) anions.
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Abstract
The formation of negative ions in molecular beams of ethylene sulfite (ES, alternately called glycol sulfite or ethylene glycol, C(2)H(4)SO(3)) molecules has been studied using both Rydberg electron transfer (RET) and free electron attachment methods. RET experiments with jet-cooled ES show an unexpected broad profile of anion formation as a function of the effective quantum number (n(*)) of the excited rubidium atoms, with peaks at n(max)(*) approximately 13.5 and 16.8. The peak at n(max)(*) approximately 16.8 corresponds to an expected dipole-bound anion with an electron binding energy of 8.5 meV. It is speculated that the peak at n(max)(*) approximately 13.5 derives from the formation of a distorted C(2)H(4)SO(3)(-) ion. We suggest that quasifree electron attachment promotes the breaking of one ring bond giving a long-lived acyclic anion and term this process incomplete dissociative electron attachment. Theoretical calculations of plausible ionic structures are presented and discussed. Electron beam studies of ES reveal the presence of multiple dissociative attachment channels, with the dominant fragment, SO(2)(-), peaking at 1.3 eV and much weaker signals due to SO(3)(-), SO(-), and (ES-H)(-) peaking at 1.5, 1.7, and 0.9 eV, respectively. All of these products appear to originate from a broad temporary negative ion resonance centered at approximately 1.4 eV.
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Calculation of the photodetachment cross sections of the HCN- and HNC- dipole-bound anions as described by a one-electron Drude model. J Chem Phys 2004; 121:1824-9. [PMID: 15260733 DOI: 10.1063/1.1766296] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
The Drude model for treating the interaction of excess electrons with polar molecules is extended to calculate continuum functions and to evaluate photodetachment cross sections. The approach is applied to calculate the cross sections for photodetachment of dipole-bound electrons from HCN(-) and HNC(-). In addition, an adiabatic model separating the angular and radial degrees of freedom of the excess electron is introduced and shown to account in a qualitative manner for the cross sections.
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Abstract
We report the OH stretching vibrational spectra of size-selected H+(H2O)n clusters through the region of the pronounced "magic number" at n = 21 in the cluster distribution. Sharp features are observed in the spectra and assigned to excitation of the dangling OH groups throughout the size range 6 </= n </= 27. A multiplet of such bands appears at small cluster sizes. This pattern simplifies to a doublet at n = 11, with the doublet persisting up to n = 20, but then collapsing to a single line in the n = 21 and n = 22 clusters and reemerging at n = 23. This spectral simplification provides direct evidence that, for the magic number cluster, all the dangling OH groups arise from water molecules in similar binding sites.
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Parallel-tempering Monte Carlo simulations of the finite temperature behavior of (H2O)6−. J Chem Phys 2003. [DOI: 10.1063/1.1624597] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
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Theoretical study of small water clusters: low-energy fused cubic structures for (H2O)n, n = 8, 12, 16, and 20. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100122a005] [Citation(s) in RCA: 223] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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21
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22
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Ionization potentials, electron affinities, and molecular orbitals of 2-substituted norbornadienes. Theory of 1,2 and homo-1,4 carbene cycloaddition selectivities. J Am Chem Soc 2002. [DOI: 10.1021/ja00355a006] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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23
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Attractive nature of excited argon(3P) + molecular hydrogen interaction and the excited argon(3P0.2) + molecular hydrogen .fwdarw. argon(1S) + atomic hydrogen + atomic hydrogen process. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100232a007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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24
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Experimental observations of large interactions of .pi.* orbitals through four bonds. J Am Chem Soc 2002. [DOI: 10.1021/ja00388a094] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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25
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Use of an eigenmode method to locate the stationary points on the potential energy surfaces of selected argon and water clusters. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100145a019] [Citation(s) in RCA: 186] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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26
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Study of long-range .pi.*,.pi.* interactions in rigid molecules by electron transmission spectroscopy. J Am Chem Soc 2002. [DOI: 10.1021/ja00257a010] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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27
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Electron energy loss studies of vibrational and electronic excitation processes in 1,3-butadiene: the role of core-excited anion states. J Am Chem Soc 2002. [DOI: 10.1021/ja00020a001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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28
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Ab initio calculation of the energy of recombinative hydrogen desorption from the monohydride phase of silicon (100). ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100147a019] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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29
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Theoretical study of the low-lying triplet and singlet states of tetramethyleneethane: prediction of a triplet below singlet state at the triplet equilibrium geometry. J Am Chem Soc 2002. [DOI: 10.1021/ja00054a038] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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30
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Theoretical study of the structures and stabilities of the carbon dioxide dimer ((CO2)2-) ions. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100290a006] [Citation(s) in RCA: 90] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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31
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32
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Electron transmission studies of the negative ion states of substituted benzenes in the gas phase. J Am Chem Soc 2002. [DOI: 10.1021/ja00439a014] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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The importance of f functions and 3d electron correlation effects in the bonding in diatomic copper (Cu2). ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100249a017] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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35
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36
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Comparison of Density Functional and MP2 Calculations on the Water Monomer and Dimer. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100091a024] [Citation(s) in RCA: 717] [Impact Index Per Article: 32.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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37
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Ab initio study of the structure and vibrational frequencies of the Grignard reagent methylmagnesium chloride. J Am Chem Soc 2002. [DOI: 10.1021/ja00378a047] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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38
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Temporary anion states of hydrogen cyanide, methyl cyanide, and methylene dicyanide, selected cyanoethylenes, benzonitrile, and tetracyanoquinodimethane. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100198a017] [Citation(s) in RCA: 101] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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39
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Dissociative Attachment as a Probe of the Distance Dependence of Intramolecular Electron Transfer. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100033a003] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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40
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Temporary anion states of phosphabenzene, arsabenzene, and stibabenzene. Trends in the .pi. and .pi.* orbital energies. J Am Chem Soc 2002. [DOI: 10.1021/ja00366a009] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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41
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42
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Experimental study of the negative ion states of styrene. A test of the pairing theorem. J Am Chem Soc 2002. [DOI: 10.1021/ja00436a059] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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43
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Stabilization calculations on the .pi.* anion states of 1,4-cyclohexadiene: confirmation of the .pi.-* below .pi.+* orbital ordering. J Am Chem Soc 2002. [DOI: 10.1021/ja00008a018] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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44
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Use of the X.alpha. method for the characterization of temporary negative ions of benzene and substituted benzenes. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100306a017] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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45
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Geometrics of the radical anions of ethylene, fluoroethylene, 1,1-difluoroethylene, and tetrafluoroethylene. J Am Chem Soc 2002. [DOI: 10.1021/ja00368a060] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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46
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Electron transmission spectroscopy of 1,3,5-hexatriene: isomeric differences in .pi. orbital energies. J Am Chem Soc 2002. [DOI: 10.1021/ja00383a051] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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47
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Determination of the energies and spectroscopic constants of the low-lying electronic states of aluminum dimers (Al2, Al2+, and Al2-). ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100321a017] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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48
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Temporary negative ions of methyl-substituted ethylenes: trends in the electron affinities, ionization potentials, and excitation energies. J Am Chem Soc 2002. [DOI: 10.1021/ja00542a053] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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49
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Comment on the boron(2P) + water .fwdarw. boron monoxide (BO)(X2.SIGMA.,A2.PI.) + molecular hydrogen(X1.SIGMA.g) reaction. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100236a011] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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50
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Application of a Drude model to the binding of excess electrons to water clusters. J Chem Phys 2002. [DOI: 10.1063/1.1461811] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
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