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Abstract
Spectroscopic characterizations of the stereochemistry of complexes of ammonia (NH(3)) have strongly confirmed some long-held ideas about the weak interactions of NH(3) while casting doubt on others. As expected, NH(3) is observed to be a nearly universal proton acceptor, accepting hydrogen bonds from even some of the weakest proton donors. Surprisingly, no evidence has been found to support the view that NH(3) acts as a proton donor through hydrogen bonding. A critical evaluation of the work that has been done to gather such evidence, as well as of earlier work involving condensed-phase observations, suggests that NH(3) might well be best described as a powerful hydrogen-bond acceptor with little propensity to donate hydrogen bonds.
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Affiliation(s)
- W Klemperer
- DEPARTMENT OF CHEMISTRY, HARVARD UNIVERSITY, CAMBRIDGE, MASSACHUSETTS
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Leopold KR, Fraser GT, Klemperer W. Rotational spectroscopy of molecular complexes of boron fluoride with ethanedinitrile, carbon dioxide, and nitrous oxide. J Am Chem Soc 2002. [DOI: 10.1021/ja00316a010] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Janda KC, Bernstein LS, Steed JM, Novick SE, Klemperer W. Synthesis, microwave spectrum, and structure of ArBF3, BF3CO, and N2BF3. J Am Chem Soc 2002. [DOI: 10.1021/ja00494a008] [Citation(s) in RCA: 128] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Baiocchi FA, Williams JH, Klemperer W. Molecular beam studies of hexafluorobenzene, trifluorobenzene, and benzene complexes of hydrogen fluoride. The rotational spectrum of benzene-hydrogen fluoride. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100235a012] [Citation(s) in RCA: 80] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Cavanagh RR, Altman RS, Herschbach DR, Klemperer W. Molecular beam electric deflection analysis of (SN)x vapor. Evidence for a nonpolar tetramer. J Am Chem Soc 2002. [DOI: 10.1021/ja00510a052] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Cooksy AL, Tao FM, Klemperer W, Thaddeus P. Structures, Electronic Properties, and Isomerization of the HCCCO Radical. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100028a009] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Affiliation(s)
- W Klemperer
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA.
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Chang H, Klemperer W. A phenomenological model for the vibrational dependence of hydrogen interchange tunneling in HF dimer. J Chem Phys 1996. [DOI: 10.1063/1.471499] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Schramm DN, Rosner R, Luo X, Klemperer W. On the possibility of coherently stimulated recombination and cosmological structure generation: cosmological consequences. Proc Natl Acad Sci U S A 1995; 92:6171-4. [PMID: 11607553 PMCID: PMC41664 DOI: 10.1073/pnas.92.13.6171] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Given a specific physical mechanism for instabilities during cosmological recombination discussed in an earlier paper, we examine the nonlinear growth of density structures to form fractal-like structural patterns out to the horizon scale at that epoch (approximately 200 Mpc today). A model for such fractal patterns is presented. Such effects could explain observed large-scale structure patterns and the formation of objects at high z, while keeping microwave background anisotropies at the observed minimal levels. We also discuss possible microwave background implications of such a transition and note a potentially observable spectral signature at lambda approximately 0.18 mm as well as a weak line near the peak in the microwave background.
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Affiliation(s)
- D N Schramm
- Department of Astronomy and Astrophysics, University of Chicago, Chicago, IL 60637, USA
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Klemperer W, Luo X, Rosner R, Schramm DN. On the possibility of coherently stimulated recombination and cosmological structure generation: recombination instability. Proc Natl Acad Sci U S A 1995; 92:6166-70. [PMID: 11607552 PMCID: PMC41663 DOI: 10.1073/pnas.92.13.6166] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Possible instabilities during cosmological recombination may produce an epoch of nonlinear density growth and fractal-like structural patterns out to the horizon scale at that epoch (approximately 200 Mpc today). With this motivation, we examine the consequences of the change in effective radiative recombination reaction rate coefficients produced by intense stimulated emission. The proton-electron recombination is considered as a natural laser, leading to the formation of spatially nonuniform distributions of neutral matter earlier than the recombination epoch.
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Affiliation(s)
- W Klemperer
- Department of Chemical Physics, Harvard University, Cambridge, MA 02138, USA
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Cooksy AL, Elrod MJ, Saykally RJ, Klemperer W. Dipole moment analysis of excited van der Waals vibrational states of ArH35Cl. J Chem Phys 1993. [DOI: 10.1063/1.465128] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Zolandz D, Yaron D, Peterson KI, Klemperer W. Water in weak interactions: The structure of the water–nitrous oxide complex. J Chem Phys 1992. [DOI: 10.1063/1.463028] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Zwart E, Linnartz H, Meerts WL, Fraser GT, Nelson DD, Klemperer W. Microwave and submillimeter spectroscopy of Ar–NH3 states correlating with Ar+NH3 (j=1,‖k‖=1). J Chem Phys 1991. [DOI: 10.1063/1.461086] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Yaron D, Peterson KI, Zolandz D, Klemperer W, Lovas FJ, Suenram RD. Water hydrogen bonding: The structure of the water–carbon monoxide complex. J Chem Phys 1990. [DOI: 10.1063/1.458250] [Citation(s) in RCA: 107] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Nelson DD, Klemperer W. Classification of the tunneling‐rotational energy levels of ammonia dimer in the molecular symmetry group. J Chem Phys 1987. [DOI: 10.1063/1.453707] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Nelson DD, Fraser GT, Peterson KI, Zhao K, Klemperer W, Lovas FJ, Suenram RD. The microwave spectrum of the K=0 states of Ar–NH3. J Chem Phys 1986. [DOI: 10.1063/1.451562] [Citation(s) in RCA: 85] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Peterson KI, Klemperer W. Water–hydrocarbon interactions: Structure and internal rotation of the water–ethylene complex. J Chem Phys 1986. [DOI: 10.1063/1.451279] [Citation(s) in RCA: 57] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Fraser GT, Nelson DD, Gerfen GJ, Klemperer W. The rotational spectrum, barrier to internal rotation, and structure of NH3–N2O. J Chem Phys 1985. [DOI: 10.1063/1.449714] [Citation(s) in RCA: 36] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Fraser GT, Nelson DD, Charo A, Klemperer W. Microwave and infrared characterization of several weakly bound NH3complexesa). J Chem Phys 1985. [DOI: 10.1063/1.448303] [Citation(s) in RCA: 172] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Leopold KR, Fraser GT, Lin FJ, Nelson DD, Klemperer W. Microwave and radiofrequency Stark spectrum of ArHCN: A highly nonrigid molecule. J Chem Phys 1984. [DOI: 10.1063/1.447476] [Citation(s) in RCA: 80] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Peterson KI, Klemperer W. Water–hydrocarbon interactions: Rotational spectroscopy and structure of the water–acetylene complex. J Chem Phys 1984. [DOI: 10.1063/1.448167] [Citation(s) in RCA: 91] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Marshall MD, Klemperer W. Deuterium nuclear quadrupole coupling constants in vibrationally excited C2HD: Evidence for electron reorganization. J Chem Phys 1984. [DOI: 10.1063/1.448041] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Baiocchi FA, Reiher W, Klemperer W. Comments on ‘‘Do electrostatic interactions predict structures of van der Waals molecules?’’. J Chem Phys 1983. [DOI: 10.1063/1.445722] [Citation(s) in RCA: 71] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Lehmann KK, Scherer GJ, Klemperer W. Variational calculation of the rotational constants for acetylene and its isotopic derivatives. J Chem Phys 1983. [DOI: 10.1063/1.445893] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Lehmann KK, Scherer GJ, Klemperer W. Comment on ‘‘The overtone spectrum of acetylene: A rotational analysis based on a local model description’’a). J Chem Phys 1983. [DOI: 10.1063/1.445512] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Altman RS, Marshall MD, Klemperer W, Krupnov A. Electric dipole moment and quadrupole hyperfine structure of OC–HCl and OC–DCl. J Chem Phys 1983. [DOI: 10.1063/1.445511] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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