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1.
A. Heidenreich I. Schek D. Scharf J. Jortner 《Zeitschrift für Physik D Atoms, Molecules and Clusters》1991,20(1):227-229
The time resolved dynamics of diffusionless cube → ring isomerization of the Na4Cl4 cluster was interrogated by constant energy molecular dynamics simulations, utilizing the first passage time method. The nonreactive isomerization induced by nonselective vibrational excitation is well accounted for in terms of the statistical RRK theory, opening avenues for experimental exploration of time-resolved cluster isomerization dynamics. 相似文献
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A. Heidenreich Joshua Jortner 《Zeitschrift für Physik D Atoms, Molecules and Clusters》1993,26(1):377-381
Spectral lineshapes of the electronic origin of tetracene·Arn (n=1–3,19) clusters have been simulated by the semiclassical spectral density method [L. E. Fried, S. Mukamel, J. Chem. Phys.96, 116 (1992)]. Information is obtained concerning the spectral shifts, the homogeneous linewidths and their temperature dependence. 相似文献
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Andrew J. Heidenreich Judit E. Puskas Michel Schappacher Emmanuel Ibarboure Alain Deffieux 《Journal of polymer science. Part A, Polymer chemistry》2012,50(6):1238-1247
This article presents the utilization of “molecular amplification” to visualize the molecular architecture of “arborescent” (tree‐like) polystyrenes (arbPSs) using atomic force microscopy (AFM). arbPSs with Mn > 80,000 g/mol were synthesized via initiator‐monomer‐type (inimer) RAFT polymerization of styrene mediated by 4‐vinylbenzyl dithiobenzoate in bulk. These arbPS were then used as macrochain transfer agents for polymerization of vinylbenzyl chloride (VBCl) to give arborescent poly(styrene‐block‐vinylbenzyl chloride) (arbPS‐b‐VBCl). Poly(styryl) diphenylethyl lithium (Mn = 11,000 g/mol) was then grafted onto the VBCl units of the arbPS‐b‐VBCl. The Mn of the amplified arbPSs increased over >10 million g/mol, exceeding the exclusion limit of our size exclusion chromatography equipment. AFM confirmed the proposed branches on branches architecture in the samples, together with lesser branched species. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012 相似文献
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H. Stettin H. Kresse S. Haas W. Schfer G. Heidenreich H. Zaschke 《Crystal Research and Technology》1989,24(6):649-655
New liquid crystalline substances with four benzene rings have been synthesized. A nematic two frequency mixture containing some of these compounds was produced and dielectrically as well as electrooptically investigated. With dielectric measurements a very low frequent and distributed relaxation mechanism at room temperature could be estimated (fR = 0.0565 kHz, h = 0.25 at 294.2 K). Although new substances have been used the switching behaviour in a TN cell showed disturbances as on an earlier developed two frequency mixture. 相似文献
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Heidenreich BJ Elliott OT Charney ND Virgien KA Bridges AW McKeon MA Peck SK Krause D Gordon JE Hunter LR Lamoreaux SK 《Physical review letters》2005,95(25):253004
A new method for the detection of the electron electric dipole moment (EDM) using a solid is described. The method involves the measurement of a voltage induced across the solid by the alignment of the sample's magnetic dipoles in an applied magnetic field, H. A first application of the method to GdIG has resulted in a limit on the electron EDM of 5 x 10(-24)e cm, which is a factor of 40 below the limit obtained from the only previous solid-state EDM experiment. The result is limited by the imperfect discrimination of an unexpectedly large voltage that is even upon the reversal of the sample magnetization. 相似文献
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P. Jannasch und O. Heidenreich 《Fresenius' Journal of Analytical Chemistry》1897,36(1):382-384
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