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Zhang R, Chen J, Yan S, Jie W, Ning C. Photodetachment and Tunneling Dissociation of Cryogenic Double-Rydberg Anions NH 4. J Phys Chem Lett 2024; 15:5612-5617. [PMID: 38758204 DOI: 10.1021/acs.jpclett.4c01168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/18/2024]
Abstract
The Rydberg radical NH4 and the double Rydberg anion (DRA) NH4- have long aroused researchers' interests due to their potential for exploring the reaction dynamics of the H + NH3 → H2 + NH2 reaction, a prototypical penta-atomic system. In this study, we present high-resolution photodetachment spectroscopy of DRA NH4- and ion-molecule complex H-(NH3). We observed multiple new photodetachment channels of DRA NH4-. The energy level of the excited state (3p 2T2) of the Rydberg radical NH4 was determined to be 15052(94) cm-1, in excellent agreement with the principal Schüler band (15061.61 cm-1). Additionally, we observed the tunneling dissociation of NH4- in a cryogenic ion trap with its dissociation lifetime determined to be 19(2) ms.
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Affiliation(s)
- Rui Zhang
- Department of Physics, State Key Laboratory of Low Dimensional Quantum Physics, Frontier Science Center for Quantum Information, Tsinghua University, Beijing 100084, China
| | - Jiayi Chen
- Department of Physics, State Key Laboratory of Low Dimensional Quantum Physics, Frontier Science Center for Quantum Information, Tsinghua University, Beijing 100084, China
| | - Shuaiting Yan
- Department of Physics, State Key Laboratory of Low Dimensional Quantum Physics, Frontier Science Center for Quantum Information, Tsinghua University, Beijing 100084, China
| | - Wenru Jie
- Department of Physics, State Key Laboratory of Low Dimensional Quantum Physics, Frontier Science Center for Quantum Information, Tsinghua University, Beijing 100084, China
| | - Chuangang Ning
- Department of Physics, State Key Laboratory of Low Dimensional Quantum Physics, Frontier Science Center for Quantum Information, Tsinghua University, Beijing 100084, China
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2
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Affiliation(s)
- Jack P Simons
- Chemistry, University of Utah, United States of America
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3
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Abstract
By using high-level ab initio methods, we examine the nature of bonding between Rydberg electrons hosted by two four-coordinate nitrogen centers embedded in a hydrocarbon scaffold. The electronic structure of these species resembles that of diradicals, yet the diffuse nature of the orbitals hosting the unpaired electrons results in unusual features. The unpaired Rydberg electrons exhibit long-range bonding interactions, leading to stabilization of the singlet state (relative to the triplet) and a reduced number of effectively unpaired electrons. However, thermochemical gains due to through-space bonding are offset by strong Coulomb repulsion between positively charged nitrogen cores. The kinetic stability of these Rydberg diradicals may be controlled by a judicious choice of the molecular scaffold, suggesting possible strategies for their experimental characterization.
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Affiliation(s)
- Maxim V Ivanov
- Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States
| | - Anna I Krylov
- Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States
| | - Shmuel Zilberg
- Department of Chemical Sciences, Ariel University, Ariel 40700, Israel
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4
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Díaz-Tinoco M, Ortiz JV. Double Rydberg anions with solvated ammonium kernels: Electron binding energies and Dyson orbitals. J Chem Phys 2019. [DOI: 10.1063/1.5113614] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Affiliation(s)
- Manuel Díaz-Tinoco
- Department of Chemistry and Biochemistry, Auburn University, Auburn, Alabama 36849-5312, USA
| | - J. V. Ortiz
- Department of Chemistry and Biochemistry, Auburn University, Auburn, Alabama 36849-5312, USA
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5
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Hu Q, Song H, Johnson CJ, Li J, Guo H, Continetti RE. Imaging a multidimensional multichannel potential energy surface: Photodetachment of H−(NH3) and NH4−. J Chem Phys 2016; 144:244311. [DOI: 10.1063/1.4954187] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Qichi Hu
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0340, USA
| | - Hongwei Song
- Department of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131, USA
| | - Christopher J. Johnson
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0340, USA
| | - Jun Li
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China
| | - Hua Guo
- Department of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131, USA
| | - Robert E. Continetti
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0340, USA
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6
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Fujihara A, Matsuo S, Tajiri M, Wada Y, Hayakawa S. Hypervalent radical formation probed by electron transfer dissociation of zwitterionic tryptophan and tryptophan-containing dipeptides complexed with Ca2+ and 18-crown-6 in the gas phase. JOURNAL OF MASS SPECTROMETRY : JMS 2015; 50:1124-1129. [PMID: 26456780 DOI: 10.1002/jms.3628] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2015] [Revised: 06/08/2015] [Accepted: 06/08/2015] [Indexed: 06/05/2023]
Abstract
The relationship between peptide structure and electron transfer dissociation (ETD) is important for structural analysis by mass spectrometry. In the present study, the formation, structure and reactivity of the reaction intermediate in the ETD process were examined using a quadrupole ion trap mass spectrometer equipped with an electrospray ionization source. ETD product ions of zwitterionic tryptophan (Trp) and Trp-containing dipeptides (Trp-Gly and Gly-Trp) were detected without reionization using non-covalent analyte complexes with Ca(2+) and 18-crown-6 (18C6). In the collision-induced dissociation, NH3 loss was the main dissociation pathway, and loss related to the dissociation of the carboxyl group was not observed. This indicated that Trp and its dipeptides on Ca(2+) (18C6) adopted a zwitterionic structure with an NH3 (+) group and bonded to Ca(2+) (18C6) through the COO(-) group. Hydrogen atom loss observed in the ETD spectra indicated that intermolecular electron transfer from a molecular anion to the NH3 (+) group formed a hypervalent ammonium radical, R-NH3 , as a reaction intermediate, which was unstable and dissociated rapidly through N-H bond cleavage. In addition, N-Cα bond cleavage forming the z1 ion was observed in the ETD spectra of Trp-GlyCa(2+) (18C6) and Gly-TrpCa(2+) (18C6). This dissociation was induced by transfer of a hydrogen atom in the cluster formed via an N-H bond cleavage of the hypervalent ammonium radical and was in competition with the hydrogen atom loss. The results showed that a hypervalent radical intermediate, forming a delocalized hydrogen atom, contributes to the backbone cleavages of peptides in ETD.
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Affiliation(s)
- Akimasa Fujihara
- Department of Chemistry, Osaka Prefecture University, Sakai, Osaka, 599-8531, Japan
| | - Sou Matsuo
- Department of Chemistry, Osaka Prefecture University, Sakai, Osaka, 599-8531, Japan
| | - Michiko Tajiri
- Department of Molecular Medicine, Osaka Medical Center and Research Institute for Maternal and Child Health, Sakai, Osaka, 594-1101, Japan
| | - Yoshinao Wada
- Department of Molecular Medicine, Osaka Medical Center and Research Institute for Maternal and Child Health, Sakai, Osaka, 594-1101, Japan
| | - Shigeo Hayakawa
- Department of Chemistry, Osaka Prefecture University, Sakai, Osaka, 599-8531, Japan
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7
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Han H, Song H, Li J, Guo H. Near Spectroscopically Accurate Ab Initio Potential Energy Surface for NH4+ and Variational Calculations of Low-Lying Vibrational Levels. J Phys Chem A 2015; 119:3400-6. [DOI: 10.1021/acs.jpca.5b01835] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Huixian Han
- Department
of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131, United States
- School
of Physics, Northwest University, Xi’an, Shaanxi 710069, China
| | - Hongwei Song
- Department
of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131, United States
| | - Jun Li
- School
of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400030, China
| | - Hua Guo
- Department
of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131, United States
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Li J, Guo H. A nine-dimensional global potential energy surface for NH4(X2A1) and kinetics studies on the H + NH3 ↔ H2 + NH2 reaction. Phys Chem Chem Phys 2014; 16:6753-63. [DOI: 10.1039/c4cp00241e] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A nine-dimensional global potential energy surface (PES) for the NH4 system is developed from ∼105 high-level ab initio points and the hydrogen abstraction kinetics on the PES agree with experiment.
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Affiliation(s)
- Jun Li
- Department of Chemistry and Chemical Biology
- University of New Mexico
- Albuquerque, USA
| | - Hua Guo
- Department of Chemistry and Chemical Biology
- University of New Mexico
- Albuquerque, USA
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9
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Pepin R, Laszlo KJ, Peng B, Marek A, Bush MF, Tureček F. Comprehensive Analysis of Gly-Leu-Gly-Gly-Lys Peptide Dication Structures and Cation-Radical Dissociations Following Electron Transfer: From Electron Attachment to Backbone Cleavage, Ion–Molecule Complexes, and Fragment Separation. J Phys Chem A 2013; 118:308-24. [DOI: 10.1021/jp411100c] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Robert Pepin
- Department of Chemistry, Bagley Hall, Box 351700, University of Washington, Seattle, Washington 98195-1700, United States
| | - Kenneth J. Laszlo
- Department of Chemistry, Bagley Hall, Box 351700, University of Washington, Seattle, Washington 98195-1700, United States
| | - Bo Peng
- Department of Chemistry, Bagley Hall, Box 351700, University of Washington, Seattle, Washington 98195-1700, United States
| | - Aleš Marek
- Department of Chemistry, Bagley Hall, Box 351700, University of Washington, Seattle, Washington 98195-1700, United States
| | - Matthew F. Bush
- Department of Chemistry, Bagley Hall, Box 351700, University of Washington, Seattle, Washington 98195-1700, United States
| | - František Tureček
- Department of Chemistry, Bagley Hall, Box 351700, University of Washington, Seattle, Washington 98195-1700, United States
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10
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Affiliation(s)
- František Tureček
- Department of Chemistry, Bagley Hall, University of Washington , Seattle, Washington 98195-1700, United States
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11
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Zimnicka M, Chung TW, Moss CL, Tureček F. Perturbing Peptide Cation-Radical Electronic States by Thioxoamide Groups: Formation, Dissociations, and Energetics of Thioxopeptide Cation-Radicals. J Phys Chem A 2012; 117:1265-75. [DOI: 10.1021/jp305865q] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Magdalena Zimnicka
- Department of Chemistry, Bagley Hall, Box
351700, University of Washington, Seattle,
Washington 98195-1700,
United States
| | - Thomas W. Chung
- Department of Chemistry, Bagley Hall, Box
351700, University of Washington, Seattle,
Washington 98195-1700,
United States
| | - Christopher L. Moss
- Department of Chemistry, Bagley Hall, Box
351700, University of Washington, Seattle,
Washington 98195-1700,
United States
| | - František Tureček
- Department of Chemistry, Bagley Hall, Box
351700, University of Washington, Seattle,
Washington 98195-1700,
United States
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12
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13
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Whiteside A, Xantheas SS, Gutowski M. Is Electronegativity a Useful Descriptor for the Pseudo-Alkali Metal NH4? Chemistry 2011; 17:13197-205. [DOI: 10.1002/chem.201101949] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2011] [Indexed: 11/08/2022]
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14
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Yamada Y, Ishikawa H, Fuke K. Solvation Structure and Stability of [(CH 3) 2NH] m(NH 3) n–H Hypervalent Clusters: Ionization Potentials and Switching of Hydrogen-Atom Localized Site. J Phys Chem A 2011; 115:8380-91. [DOI: 10.1021/jp204331q] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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15
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David O, Dedonder-Lardeux C, Jouvet C. Is there an Excited State Proton Transfer in phenol (or 1 -naphthol)-ammonia clusters? Hydrogen Detachment and Transfer to Solvent: A key for non-radiative processes in clusters. INT REV PHYS CHEM 2010. [DOI: 10.1080/01442350210164287] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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16
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Oldani AN, Ferrero JC, Pino GA. Effect of the intermolecular hydrogen bond conformation on the structure and reactivity of the p-cresol(H2O)(NH3) van der Waals complex. Phys Chem Chem Phys 2009; 11:10409-16. [DOI: 10.1039/b916901f] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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Abstract
The experimental and theoretical study of molecular anions has undergone explosive growth over the past 40 years. Advances in techniques used to generate anions in appreciable numbers as well as new ion-storage, ion-optics, and laser spectroscopic tools have been key on the experimental front. Theoretical developments on the electronic structure and molecular dynamics fronts now allow one to achieve higher accuracy and to study electronically metastable states, thus bringing theory in close collaboration with experiment in this field. In this article, many of the experimental and theoretical challenges specific to studying molecular anions are discussed. Results from many research groups on several classes of molecular anions are overviewed, and both literature citations and active (in online html and pdf versions) links to numerous contributing scientists' Web sites are provided. Specific focus is made on the following families of anions: dipole-bound, zwitterion-bound, double-Rydberg, multiply charged, metastable, cluster-based, and biological anions. In discussing each kind of anion, emphasis is placed on the structural, energetic, spectroscopic, and chemical-reactivity characteristics that make these anions novel, interesting, and important.
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Affiliation(s)
- Jack Simons
- Chemistry Department, Henry Eyring Center for Theoretical Chemistry, UniVersity of Utah, Salt Lake City, Utah, USA
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18
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Chen X, Hao C. Where Does the Electron Go? Electron Distribution and Reactivity of Peptide Cation Radicals Formed by Electron Transfer in the Gas phase. J Am Chem Soc 2008; 130:8818-33. [DOI: 10.1021/ja8019005] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xiaohong Chen
- Department of Chemistry, Bagley Hall, Box 351700, University of Washington, Seattle, Washington 98195-1700
| | - Changtong Hao
- Department of Chemistry, Bagley Hall, Box 351700, University of Washington, Seattle, Washington 98195-1700
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19
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Gutsev GL, Boldyrev AI. The Theoretical Investigation of the Electron Affinity of Chemical Compounds. ADVANCES IN CHEMICAL PHYSICS 2007. [DOI: 10.1002/9780470142851.ch3] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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20
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Ritze HH, Lippert H, Stert V, Radloff W, Hertel IV. Theoretical study of the hydrogen atom transfer in the heterodimer indole-ammonia and comparison with experimental results. J Chem Phys 2006; 120:3619-29. [PMID: 15268523 DOI: 10.1063/1.1642598] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Ab initio calculations on the heterodimer C8H6NH...NH3 are carried out for its ground, the excited pisigma*, and the ground cationic electronic states, enabling the description of hydrogen or proton transfer, respectively. Two-dimensional quantum-dynamical computations on the pisigma* potential surface help one to understand the mechanism and the time scale of the hydrogen transfer. Subsequent decay processes are discussed depending on the vibrational excitation of the ammonium constituent. Finally, the theoretical results obtained are used for the interpretation of the time-dependent signals observed in femtosecond pump-probe experiments.
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Affiliation(s)
- H-H Ritze
- Max Born Institute, Max-Born-Strasse 2A, D-12489, Berlin-Adlershof, Germany
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21
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Radisic D, Stokes ST, Bowen KH. Two new double Rydberg anions plus access to excited states of neutral Rydberg radicals via anion photoelectron spectroscopy. J Chem Phys 2005; 123:011101. [PMID: 16035826 DOI: 10.1063/1.1950669] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
We have observed and characterized two new double Rydberg anions N6H19- and N7H22- through their anion photoelectron spectra. The vertical detachment energies of these anions were found to be 0.443 and 0.438 eV, respectively. In addition, for three of the seven double Rydberg anions now known, we measured photodetachment transitions not only to the ground electronic states of their corresponding neutral Rydberg radicals but also to their first electronically excited states. In each spectrum, the energy spacing between the resulting peaks provided the ground-to-first electronically excited-state transition energy for the double Rydberg anion's corresponding neutral Rydberg radical. For the radicals, N4H13, N5H16, and N6H19, the spacings were found to be 0.83, 0.70, and 0.67 eV, respectively. These values are in excellent agreement with ground-to-first excited-state transition energies measured in absorption for the same neutral Rydberg radicals by Fuke and co-workers [Eur. Phys. J. D 9, 309 (1999); J. Phys. Chem. A 106, 5242 (2002).] The duplication of this neutral Rydberg property by photodetachment of double Rydberg anions further confirms that double Rydberg anions are indeed the negative ions of their corresponding neutral Rydberg molecules and cluster-like systems.
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Affiliation(s)
- Dunja Radisic
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, USA
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22
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Syrstad EA, Turecek F. Toward a general mechanism of electron capture dissociation. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2005; 16:208-224. [PMID: 15694771 DOI: 10.1016/j.jasms.2004.11.001] [Citation(s) in RCA: 175] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2004] [Revised: 10/30/2004] [Accepted: 11/02/2004] [Indexed: 05/24/2023]
Abstract
The effects of positive charge on the properties of ammonium and amide radicals were investigated by ab initio and density functional theory calculations with the goal of elucidating the energetics of electron capture dissociation (ECD) of multiply charged peptide ions. The electronic properties of the amide group in N-methylacetamide (NMA) are greatly affected by the presence of a remote charge in the form of a point charge, methylammonium, or guanidinium cations. The common effect of the remote charge is an increase of the electron affinity of the amide group, resulting in exothermic electron capture. The N-Calpha bond dissociation and transition state energies in charge-stabilized NMA anions are 20-50 kJ mol(-1) greater than in the hydrogen atom adduct. The zwitterions formed by electron capture have proton affinities that were calculated as 1030-1350 kJ mol(-1), and are sufficiently basic for the amide carbonyl to exothermically abstract a proton from the ammonium, guanidinium and imidazolium groups in protonated lysine, arginine, and histidine residues, respectively. A new mechanism is proposed for ECD of multiply charged peptide and protein cations in which the electron enters a charge-stabilized electronic state delocalized over the amide group, which is a superbase that abstracts a proton from a sterically proximate amino acid residue to form a labile aminoketyl radical that dissociates by N-Calpha bond cleavage. This mechanism explains the low selectivity of N-Calpha bond dissociations induced by electron capture, and is applicable to dissociations of peptide ions in which the charge carriers are metal ions or quaternary ammonium groups. The new amide superbase and the previously proposed mechanisms of ECD can be uniformly viewed as being triggered by intramolecular proton transfer in charge-reduced amide cation-radicals. In contrast, remote charge affects N-H bond dissociation in weakly bound ground electronic states of hypervalent ammonium radicals, as represented by methylammonium, CH3NH3*, but has a negligible effect on the N-H bond dissociation in the strongly bound excited electronic states. This refutes previous speculations that loss of "hot hydrogen" can occur from an excited state of an ammonium radical.
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Affiliation(s)
- Erik A Syrstad
- Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, USA
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Ortiz JV, Martin I, Velasco AM, Lavin C. Ground and excited states of NH4: Electron propagator and quantum defect analysis. J Chem Phys 2004; 120:7949-54. [PMID: 15267710 DOI: 10.1063/1.1689646] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Vertical excitation energies of the Rydberg radical NH4 are inferred from ab initio electron propagator calculations on the electron affinities of NH4+. The adiabatic ionization energy of NH4 is evaluated with coupled-cluster calculations. These predictions provide optimal parameters for the molecular-adapted quantum defect orbital method, which is used to determine Einstein emission coefficients and radiative lifetimes. Comparisons with spectroscopic data and previous calculations are discussed.
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Affiliation(s)
- J V Ortiz
- Department of Chemistry, Kansas State University, Manhattan, Kansas 66506-3701, USA.
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24
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Okai N, Takahata A, Morita M, Nonose S, Fuke K. Ultrafast Relaxation Process of Excited-State NH4 Radical in Ammonia Clusters. J Phys Chem A 2004. [DOI: 10.1021/jp030784d] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Nobuhiro Okai
- Department of Chemistry, Faculty of Science, Kobe University, Nada-ku, Kobe 657-8501, Japan
| | - Akihiro Takahata
- Department of Chemistry, Faculty of Science, Kobe University, Nada-ku, Kobe 657-8501, Japan
| | - Masayuki Morita
- Department of Chemistry, Faculty of Science, Kobe University, Nada-ku, Kobe 657-8501, Japan
| | - Shinji Nonose
- Department of Chemistry, Faculty of Science, Kobe University, Nada-ku, Kobe 657-8501, Japan
| | - Kiyokazu Fuke
- Department of Chemistry, Faculty of Science, Kobe University, Nada-ku, Kobe 657-8501, Japan
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25
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Bakken V, Helgaker T, Uggerud E. Models of fragmentations induced by electron attachment to protonated peptides. EUROPEAN JOURNAL OF MASS SPECTROMETRY (CHICHESTER, ENGLAND) 2004; 10:625-638. [PMID: 15531796 DOI: 10.1255/ejms.665] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Invoking a number of theoretical levels ranging from HF/STO-3G to CCSD(T)/aug-cc-pVQZ, we have made a detailed survey of six potential energy surfaces (NH4+, NH4*, [CH3CONHCH3]H+, [CH3CONHCH3]H*, [HCONHCH2CONH2]H+, [HCONHCH2CONH2]H*). In conjunction with this, ab inito direct dynamics calculations have been conducted, tracing out several hundred reaction trajectories to reveal details of the electron-capture dissociation mechanism. The model calculations suggest the possibility of a bimodal pattern where some of the radicals, formed upon recombination, dissociate almost directly within one picosecond, the remaining radicals being subject to complete energy redistribution with a subsequent dissociation occurring at the microsecond timescale. Both processes give rise to c and z backbone fragments, resulting from cleavage of N-Calpha bonds of the peptide chain.
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Affiliation(s)
- Vebjørn Bakken
- Department of Chemistry, University of Oslo, P.O. Box 1033 Blindern, N-0315 Oslo, Norway
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Farrar† JM. Size-dependent reactivity in open shell metal-ion polar solvent clusters: spectroscopic probes of electronic-vibration coupling, oxidation and ionization. INT REV PHYS CHEM 2003. [DOI: 10.1080/01442350310001616896] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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27
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Tureček F. Transient Intermediates of Chemical Reactions by Neutralization-Reionization Mass Spectrometry. Top Curr Chem (Cham) 2003. [DOI: 10.1007/3-540-36113-8_3] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2023]
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28
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Turecek F. Stereochemical interactions in ammonium dications, hypervalent diammonium cation-radicals and ammonium radicals. A B3-MP2 computational study. EUROPEAN JOURNAL OF MASS SPECTROMETRY (CHICHESTER, ENGLAND) 2003; 9:267-277. [PMID: 12939479 DOI: 10.1255/ejms.548] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Hypervalent ammonium radicals and cation-radicals derived from cis and trans-cyclopentane-1,2-diamine have been studied computationally with the goal of elucidating intramolecular interactions between the ammonium and amine functional groups in a conformationally rigid model system. Hypervalent cis and trans-cyclopentane-1-ammonium-2-amine radicals are only marginally stable against dissociation by loss of an ammonium hydrogen atom and ammonia. The radicals are predicted to exhibit very similar dissociations originating from the ground and excited electronic states. The dissociation and transition state energies in bifunctional hypervalent ammonium radicals are analogous to those reported previously for monofunctional ammonium radicals. Stereochemical effects are predicted to occur in the formation and dissociations of hypervalent cis and trans-cyclopentane-1,2-diammonium cation-radicals. The cis-isomer is calculated to undergo very facile elimination of dihydrogen resulting from a dipolar H(+)....H(-) interaction between the ammonium groups. The trans-isomer is predicted to spontaneously dissociate to a complex of cyclopentene cation-radical and two ammonia molecules.
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Affiliation(s)
- Frantisek Turecek
- Department of Chemistry, Bagley Hall, Box 351700, University of Washington, Seattle, WA 981195-1700, USA
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Xu SJ, Nilles JM, Hendricks JH, Lyapustina SA, Bowen KH. Double Rydberg anions: Photoelectron spectroscopy of NH4−, N2H7−, N3H10−, N4H13−, and N5H16−. J Chem Phys 2002. [DOI: 10.1063/1.1499491] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Nonose S, Taguchi T, Chen F, Iwata S, Fuke K. Electronic Spectra and Structures of Solvated NH4 Radicals, NH4(NH3)n (n = 1−8). J Phys Chem A 2002. [DOI: 10.1021/jp0145457] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shinji Nonose
- Department of Chemistry, Faculty of Science, Kobe University, Kobe 657-8501, Japan, Japan Science and Technology Corporation, Japan, Institute of Molecular Science, Okazaki 444-8585, Japan, and Evaluation of University Education and Research, NIAD, Chiyoda, Tokyo 101-8436, Japan
| | - Tomokazu Taguchi
- Department of Chemistry, Faculty of Science, Kobe University, Kobe 657-8501, Japan, Japan Science and Technology Corporation, Japan, Institute of Molecular Science, Okazaki 444-8585, Japan, and Evaluation of University Education and Research, NIAD, Chiyoda, Tokyo 101-8436, Japan
| | - Feiwu Chen
- Department of Chemistry, Faculty of Science, Kobe University, Kobe 657-8501, Japan, Japan Science and Technology Corporation, Japan, Institute of Molecular Science, Okazaki 444-8585, Japan, and Evaluation of University Education and Research, NIAD, Chiyoda, Tokyo 101-8436, Japan
| | - Suehiro Iwata
- Department of Chemistry, Faculty of Science, Kobe University, Kobe 657-8501, Japan, Japan Science and Technology Corporation, Japan, Institute of Molecular Science, Okazaki 444-8585, Japan, and Evaluation of University Education and Research, NIAD, Chiyoda, Tokyo 101-8436, Japan
| | - Kiyokazu Fuke
- Department of Chemistry, Faculty of Science, Kobe University, Kobe 657-8501, Japan, Japan Science and Technology Corporation, Japan, Institute of Molecular Science, Okazaki 444-8585, Japan, and Evaluation of University Education and Research, NIAD, Chiyoda, Tokyo 101-8436, Japan
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Chen F, Davidson ER. Electronic, Structural, and Hyperfine Interaction Investigations on Rydberg Molecules: NH4, OH3, and FH2. J Phys Chem A 2001. [DOI: 10.1021/jp013053r] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Feiwu Chen
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405-7102
| | - Ernest R. Davidson
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405-7102
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Grégoire G, Dedonder-Lardeux C, Jouvet C, Martrenchard S, Solgadi D. Has the Excited State Proton Transfer Ever Been Observed in Phenol−(NH3)n Molecular Clusters? J Phys Chem A 2001. [DOI: 10.1021/jp0046039] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- G. Grégoire
- Laboratoire de Photophysique Moléculaire du CNRS, Bât. 210, Université de Paris Sud, 91405 Orsay Cedex, France
| | - C. Dedonder-Lardeux
- Laboratoire de Photophysique Moléculaire du CNRS, Bât. 210, Université de Paris Sud, 91405 Orsay Cedex, France
| | - C. Jouvet
- Laboratoire de Photophysique Moléculaire du CNRS, Bât. 210, Université de Paris Sud, 91405 Orsay Cedex, France
| | - S. Martrenchard
- Laboratoire de Photophysique Moléculaire du CNRS, Bât. 210, Université de Paris Sud, 91405 Orsay Cedex, France
| | - D. Solgadi
- Laboratoire de Photophysique Moléculaire du CNRS, Bât. 210, Université de Paris Sud, 91405 Orsay Cedex, France
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Barrios R, Skurski P, Simons J. Characterization of the Rydberg Bonding in (NH4)2-. J Phys Chem A 2000. [DOI: 10.1021/jp001322s] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Robyn Barrios
- Henry Eyring Center for Theoretical Chemistry, Department of Chemistry, University of Utah, Salt Lake City, Utah 84112
| | - Piotr Skurski
- Henry Eyring Center for Theoretical Chemistry, Department of Chemistry, University of Utah, Salt Lake City, Utah 84112
| | - Jack Simons
- Henry Eyring Center for Theoretical Chemistry, Department of Chemistry, University of Utah, Salt Lake City, Utah 84112
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Sperry DC, Lee JI, Farrar JM. Cluster size specific chemistry: deuterium atom pickup in Sr+ solvated by ammonia. Chem Phys Lett 1999. [DOI: 10.1016/s0009-2614(99)00331-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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36
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Park JK. Potential energy curves for the dissociation of the Rydberg NH4 radical into (NH2+H2). J Chem Phys 1998. [DOI: 10.1063/1.477645] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Martin I, Lavín C, Pérez-Delgado Y, Karwowski J, Diercksen G. Vertical Electron Transitions in Rydberg Radicals. ADVANCES IN QUANTUM CHEMISTRY 1998. [DOI: 10.1016/s0065-3276(08)60413-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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38
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Park JK. Avoided curve crossing for the dissociation of the Rydberg NH4 radical into (NH3+H). J Chem Phys 1997. [DOI: 10.1063/1.474942] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Nguyen VQ, Sadilek M, Ferrier J, Frank AJ, Tureček F. Metastable States of Dimethylammonium, (CH3)2NH2•. J Phys Chem A 1997. [DOI: 10.1021/jp964077e] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Viet Q. Nguyen
- Department of Chemistry, Bagley Hall, Box 351700, University of Washington, Seattle, Washington 98195-1700
| | - Martin Sadilek
- Department of Chemistry, Bagley Hall, Box 351700, University of Washington, Seattle, Washington 98195-1700
| | - Jordan Ferrier
- Department of Chemistry, Bagley Hall, Box 351700, University of Washington, Seattle, Washington 98195-1700
| | - Aaron J. Frank
- Department of Chemistry, Bagley Hall, Box 351700, University of Washington, Seattle, Washington 98195-1700
| | - František Tureček
- Department of Chemistry, Bagley Hall, Box 351700, University of Washington, Seattle, Washington 98195-1700
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Signorell R, Palm H, Merkt F. Structure of the ammonium radical from a rotationally resolved photoelectron spectrum. J Chem Phys 1997. [DOI: 10.1063/1.473653] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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41
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Laser photolysis of ND4. and trimethylamine formed by collisional neutralization of their cations in the gas phase. Chem Phys Lett 1996. [DOI: 10.1016/s0009-2614(96)01200-6] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Snyder E, Purnell J, Wei S, Buzza S, Castleman A. Real-time dynamics of ammonia clusters excited through the à state: formation of the protonated cluster ions. Chem Phys 1996. [DOI: 10.1016/0301-0104(95)00402-5] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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43
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Sadílek M, Tureček F. Probing Hypervalent Radicals by Neutralization−Laser Photoionization Mass Spectrometry. ACTA ACUST UNITED AC 1996. [DOI: 10.1021/jp960172b] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Martin Sadílek
- Department of Chemistry, Box 351700, University of Washington, Seattle, Washington 98195-1700
| | - František Tureček
- Department of Chemistry, Box 351700, University of Washington, Seattle, Washington 98195-1700
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Affiliation(s)
- James S. Wright
- Ottawa-Carleton Chemistry Institute, Department of Chemistry, Carleton University, 1125 Colonel By Dr., Ottawa, Canada K1S 5B6
| | - Dan McKay
- Ottawa-Carleton Chemistry Institute, Department of Chemistry, Carleton University, 1125 Colonel By Dr., Ottawa, Canada K1S 5B6
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Sonoda Y, Iwata S. Theoretical Studies of the Chemical Processes of Producing Methylamine and Methanol in the Interstellar Space. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1996. [DOI: 10.1246/bcsj.69.575] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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46
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Martin I, Lavin A, Velasco M, Martin M, Karwowski J, Diercksen G. Quantum defect orbital study of electronic transitions in Rydberg molecules: ammonium and fluoronium radicals. Chem Phys 1996. [DOI: 10.1016/0301-0104(95)00370-3] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Fuke K, Takasu R. Ultrafast Photochemistry of Ammonia Clusters: Formation and Decay of Hypervalent Molecular Clusters Containing the NH4Radical. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1995. [DOI: 10.1246/bcsj.68.3309] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Fuke K, Takasu R, Misaizu F. Photoionization of hypervalent molecular clusters: electronic structure and stability of NH4 (NH3)n. Chem Phys Lett 1994. [DOI: 10.1016/0009-2614(94)01115-x] [Citation(s) in RCA: 68] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Kuhns DW, Turecek F. Unimolecular neutral and ion kinetics by variable-time neutralization—reionization mass spectrometry. ACTA ACUST UNITED AC 1994. [DOI: 10.1002/oms.1210290904] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Beranová Š, Wesdemiotis C. The unimolecular chemistry of quaternary ammonium ions and their neutral counterparts. ACTA ACUST UNITED AC 1994. [DOI: 10.1016/0168-1176(94)03972-0] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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