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Topic: Jahn Teller effect

	Jahn-Teller effect - Wikipedia, the free encyclopedia
		The Jahn-Teller effect, sometimes also known as Jahn-Teller distortion, describes the geometrical distortion of the electron cloud in a non-linear molecule under certain situations.
		The Jahn-Teller effect can be demonstrated experimentally by investigation of the UV-VIS absorbance spectra of inorganic compounds.
		Jahn, H. A.; Teller, E. Stability of polyatomic molecules in degenerate electronic states.
	en.wikipedia.org /wiki/Jahn-Teller_effect (357 words)

	Edward Teller \| Biography \| atomicarchive.com
		Teller graduated with a degree in chemical engineering at the University of Karlsruhe and received his Ph.D. in physics under Werner Heisenberg in 1930 at the University of Leipzig; his doctoral dissertation dealt with one of the first accurate quantum mechanical treatments of the hydrogen molecular ion.
		In 1942, Teller was invited to be part of Robert Oppenheimer's summer planning seminar at UC Berkeley for the origins of the Manhattan Project.
		Teller continued to be a tireless advocate of a strong defense policy, calling for the development of advanced thermonuclear weapons and continued nuclear testing.
	www.atomicarchive.com /Bios/Teller.shtml (658 words)

	Dynamic Jahn–Teller Effect in Buckyball Cations
		From the valence photoelectron spectrum, the group was able to unambiguously identify the relaxed geometry of the ionic ground state and determine that it was different from that believed to hold in matrix-isolated ions.
		The Jahn–Teller effect in buckyball cations is associated with the breakdown of the widely used Born–Oppenheimer approximation that allows theorists to calculate the electronic and vibrational states separately with any interaction between the two systems treatable as a small perturbation.
		The structural distortion that accompanies the Jahn–Teller effect is reflected in the photoionization spectrum.
	www-als.lbl.gov /als/science/sci_archive/58buckyball.html (949 words)

	McGraw-Hill AccessScience: Jahn-Teller effect
		The effect occurs for all nonlinear molecules in degenerate electronic states, the degeneracy of the state being removed by the effect.
		It was first predicted in 1937 by H. Jahn and E. Teller.
		In early experimental work, the effect often "disappeared" or was masked by other molecular interactions.
	www.accessscience.com /Encyclopedia/3/35/Est_358200_frameset.html (202 words)

	Magnetic interactions and the co-operative Jahn-Teller effect in KCuF3
		The effect of the magnetic order on the density of states was found to be comparatively small.
		One of the principal problems appears to be the experimentally well-characterized zero-point deviations in the spin direction, which are included neither in the Hartree-Fock theory nor in the Ising model we use to interpret the data in terms of exchange constants.
		The second effect is an enhanced stabilization of the antiferromagnetic state relative to the ferromagnetic.
	www.tcm.phy.cam.ac.uk /~mdt26/kcuf3/kcuf3.html (5319 words)

	AP270: Magnetism and Long Range Order in Solids (Site not responding. Last check: 2007-10-25)
		Magnetism and superconductivity are somewhat exclusive phenomena, and in conventional superconductors magnetic impurities have a strong pair-breaking effect.
		However, non-local effects become significant in high fields, and for LuNi2B2C and related borocarbides a phase transition to a square vortex lattice is observed by a number of techniques.
		It is a single-ion effect, but in a periodic solid, coupling with the elastic properties of the lattice provides an effective interaction between neighboring magnetic ions, leading to the co-operative Jahn-Teller effect.
	www.stanford.edu /group/Fisher/teaching/AP270/presentations.html (2168 words)

	The Jahn-Teller Effect - Cambridge University Press
		The Jahn-Teller effect is one of the most fascinating phenomena in modern physics and chemistry, providing a general approach to understanding the properties of molecules and crystals and their origins.
		The effect inspired one of the most important recent scientific discoveries, the concept of high-temperature superconductivity.
		The Jahn-Teller Effect in spectroscopy: general theory; 7.
	www.cambridge.org /catalogue/print.asp?isbn=0521822122&print=y (242 words)

	materials science 01
		In a first stage it was then believed that the Jahn-Teller effect was either drastically reduced, dynamic in character or simply non existent in Ni perovskites.
		The origin of the O isotope effect in cuprates and manganites is actually a matter of discussion.
		The present work gives strong support to this picture since this concept is also able to give a qualitative explanation of the isotope effect in Ni perovskites.
	www.ill.fr /AR-97/page/18magnet.htm (908 words)

	Publisher description for Library of Congress control number 97009078
		Because of the high symmetry involved, the Jahn-Teller effect is the natural starting point for considering electron-phonon (or vibronic) interactions in icosahedral molecules.
		The electrical and spectroscopic properties of fullerene and fulleride compounds depend intimately on the coupling between the electronic and vibrational modes of these systems, and this book addresses the fundamental theoretical questions.
		In particular, a chapter is devoted to the connection between the theory and experimental observations, such as ESR (electron spin resonance) effects and molecular spectra.
	www.loc.gov /catdir/description/prin021/97009078.html (244 words)

	International Union of Pure and Applied Chemistry
		Jahn-Teller (JT) effect - Deals with molecular distortions due to an electronically degenerate ground state.
		The pseudo Jahn-Teller effect manifests itself in fluxional behaviour (see fluxional molecules) and stereochemical nonrigidity of molecules and ions.
		Kinetic stability - The propensity of a molecular system not to undergo chemical changes in a reasonable period of time even in the presence of small external perturbations, owing to a high activation barrier.
	www.iupac.org /reports/1999/7110minkin/j-k.html (380 words)

	CMS: Researchers: Shengbai Zhang - Publications
		D.J. Chadi and S.B. Zhang, "Vacancy complexes in GaAs: effects on impurity compensation", Phys.
		S.-H. Wei, S.B. Zhang, and A. Zunger; "Effects of Na on the electrical and structural properties of CuInSe2", J.
		C.Y. Yeh, S.B. Zhang and A. Zunger; "Confinement, surface, and chemisorption effects on the optical properties of Si quantum wires", Phys.
	www.nrel.gov /cms/zhang_pub.html (1277 words)

	The Jahn-Teller Theorem
		The shielding effect this has on the electrons is used to explain why the Jahn-Teller effect is generally only important for odd number occupancy of the e
		In these cases either the time frame of the measurement does not allow the distortion to be seen because of the molecule randomly undergoing movement or else the distortion is so small as to be negligible.
		Above these temperatures the molecules appear octahedral due to the dynamic Jahn-Teller effect.
	wwwchem.uwimona.edu.jm:1104 /courses/JahnTeller.html (597 words)

	[No title] (Site not responding. Last check: 2007-10-25)
		The interpretation of the fine structure by a Jahn-Teller effect is discussed controversially in many cases.
		Another example is the spectrum of the 2T2-2E transition in hexagonal Zn0:Cu2+, which shows not only an istope effect with respect to the impurity mass but also an isotope effect with respect to the mass of the O ligands[2].
		The isotope shift of a fine structure transition is calculated from the mass dependance of the energy of the LVMs and the change of the energy levels of the final and initial state of the transition with respect to the energy of the LVM caused by a dynamical Jahn-Teller effect.
	wwwitp.physik.tu-berlin.de /scherz/abstr/abstr5.html (430 words)

	Vibronic Interactions: Jahn-Teller Effect in Crystals and by Michael D. Kaplan [ISBN: 1402000448] - Find Cheap Textbook ... (Site not responding. Last check: 2007-10-25)
		The Jahn-Teller effect is manifested in a variety of phenomena in physics, chemistry and biochemistry, in many types of crystals and molecules.
		This book deals with fundamental questions of the quantum mechanics of systems with orbital electrons, concentrating on novel phenomena and materials such as colossal magnetoresistance, high Tc superconductivity, buckminsterfullerenes, magnetic materials and biologically important clusters.
		All chapters share a common general approach to the problems, based on the analysis of vibronic interaction: electron-vibrational interaction in molecules and electron-phonon interaction in crystals.
	www.gettextbooks.com /isbn_1402000448.html (104 words)

	ExE Jahn-Teller effect (Site not responding. Last check: 2007-10-25)
		ExE Jahn-Teller effect of a cluster of an octahedrally co-ordinated impurity d-ion.
		This interaction leads to a splitting of the doubly degenerate E-state, the Jahn-Teller effect.
		When dealing with the interaction of the central ion d-electron (in an E-state) with the E-mode motion of the six ligands, i.e., the Jahn-Teller effect, Q2 and Q3 are transformed to polar co-ordinates (in Q-space) by Q2 = rho * sin(theta) and Q3 = rho *cos(theta).
	www.physik.uni-osnabrueck.de /resonanz/hjreyher/soljanka/E-Mode (342 words)

	Laboratory for Neutron Scattering ETHZ & PSI: Publications (Site not responding. Last check: 2007-10-25)
		The effect of oxygen isotope substitution on the phase diagram of nearly half-doped R
		The effects of long-ranged and short-ranged forces in confined near-critical polymeric liquids
		On the effect of aging on martensitic transformations in Ni-rich NiTi shape memory alloys
	lns.web.psi.ch /lns/publications/publications.html?2005 (2280 words)

	Jahn-Teller Effect (Site not responding. Last check: 2007-10-25)
		This results in a distortion of the electronic potential and a splitting of the degenerate vibrations of the molecule.
		From the observed spectra, it is found that the CH O system is subject to a linear as well as a quadratic JTE.
		E potential surface of CH by the linear aund quartic Jahn-Teller effect of the v
	www.uni-kiel.de /phc/topics/fakt/fakt7.htm (229 words)

	Tsukerblat
		Group theory and theory of the irreducible tensor operators with application to the problems of molecular magnetism and Jahn-Teller effect.
		Manifestation of the Jahn-Teller effect in the vibronically assisted optical bands, zero-phonon lines and non-radiative transitions in the impurity ions in insulators and semiconductors.
		E.Coronado, S.I.Klokishner, O.Reu, B.S. Tsukerblat, A pseudo Jahn-Teller model of the photochromic effect in sodium nitroprusside, Polyhedron,22(2003)2527-2535.
	www.bgu.ac.il /chem/people/Tsukerblat.html (851 words)

	PSIgate - Physical Sciences Information Gateway: Search/Browse Results
		IoP Journal Abstracts [126 - 150] The Jahn-Teller and Barnett effects J R Fletcher and D R Pooler Journal of Physics C: Solid State Physics Vol.
		15 Issue 7 Article 016 1982-03-10 The Jahn-Teller effect and stress-induced dichroism in the GR1 luminescence band of diamond G Davies Journal of Physics C: Solid State Physics Vol.
		15 Issue 3 Article 013 1982-01-30 Jahn-Teller effect of the B absorption band of Tl+-type ions in a cubic field S Asano and Y Nakao Journal of Physics C: Solid State Physics Vol.
	www.psigate.ac.uk /roads/cgi-bin/searchpublishers2.pl?limit=125&term1=Jahn-Teller (818 words)

	Dr. Magdolna Hargittai, Research Professor
		The Jahn-Teller effect and its detection in gas-phase molecules
		The structural and chemical consequences of relativistic effects
		Molecular Structure, Bonding and Jahn-Teller Effect in Gold Chlorides: Quntum Chemical Study of AuCl3, Au2Cl6, AuCl4-, AuCl, and Au2Cl2 and Electron Diffraction Study of Au2Cl6
	www.chem.elte.hu /departments/mtaszerk/fio.html (761 words)

	Encyclopedia :: encyclopedia : Condensed matter physics (Site not responding. Last check: 2007-10-25)
		Electronic properties - Band gap; Bloch wave; Conduction band; Effective mass; Electrical conduction; Electron hole; Valence band
		Electronic phenomena - Kondo effect; Plasmon; Quantum Hall effect; Superconductivity; Wigner crystal; Thermoelectricity
		Lattice phenomena - Antiferromagnet; Ferroelectric effect; Ferromagnet; Magnon; Phonon; Spin glass; Topological defect
	www.hallencyclopedia.com /Condensed_matter_physics (416 words)

	Jahn-Teller effect and stability of the charge-ordered state in $\chem{La}$ $_{1-x}$ $\chem{Ca}$ $_x$ $\chem{MnO_3}$ ... (Site not responding. Last check: 2007-10-25)
		Jahn-Teller effect and stability of the charge-ordered state in $\chem{La}$ $_{1-x}$ $\chem{Ca}$ $_x$ $\chem{MnO_3}$ $(0.5\leq x\leq 0.9)$ manganites
		Jahn-Teller effect and stability of the charge-ordered state in
		43.35.+d - Ultrasonics, quantum acoustics, and physical effects of sound.
	www.edpsciences.org /articles/epl/abs/2002/23/7373/7373.html (177 words)

	PASPS III Conference: Poster Session
		Magnetic anisotropy of bulk GaMnN:Mg single crystals: the role of Jahn-Teller effect of Mn^3+(d^4) center
		This supposition was confirmed by EPR experiment which indicated that Mn^2+(d^5) configuration is not the dominant one in GaMnN:Mg sample [2].
		In contrast to Mn^2+(d^5), the non-spherical Mn^3+(d^4) ground state, being equivalent to Cr^2+ in II-VI compounds, should reveal static Jahn-Teller effect and magnetic anisotropy.
	www.sainc.com /pasps3/agendaposterView.asp?paperID=30 (379 words)

	American Journal of Physics 1993 August
		The Jahn-Teller effect (JTE) is defined and the historical background of the Jahn-Teller theorem is briefly discussed.
		The possible roles of the Jahn-Teller effect in C[sub 60] (buckminsterfullerene) and superconducting K[sub 3]C[sub 60] are also considered.
		The subtlety and the rich physical content of the problem show in the appearance of quite different stages in the evolution of the gas: switching on effects of the field, quasistationary linear response regime, long-time field dominated heating of the gas.
	www.acs.appstate.edu /orgs/tptindex/files/AJP1990s/1993/3892_6108_ajp1993_aug.html (1616 words)

	XVI Jahn-Teller Conference - Programme
		Influence of the Cooperative Jahn-Teller Effect on the Transport and Magnetic Properties of La Sr
		Jahn-Teller Effect and the Luminescence Spectra of V
		Dynamic Jahn-Teller Effects in the EPR Spectra of Copper Impurity Clusters embedded in BaF
	www.quantchem.kuleuven.ac.be /erwin/scientific.html (788 words)

	[No title]
		The Stark Effect in Molecules with Strong Nuclear Quadrupole Coupling, A.D. Buckingham and P.J. Stephens, Molecular Physics, 7, 48l-491 (l964).
		Dynamic Jahn-Teller Effect in Trigonally Distorted Cubic Systems, P.J. Stephens, J. Chem Phys., 51, 1995-2005 (1969).
		Polarizable Continuum Model (PCM) Calculations of Solvent Effects on Optical Rotations of Chiral Molecules, B. Mennucci, J. Tomasi, R. Cammi, J.R. Cheeseman, M.J. Frisch, F.J. Devlin, S. Gabriel and P.J. Stephens, J. Phys.
	www-rcf.usc.edu /~pstephen (10963 words)

	[No title]
		No stabilization and thus no distortion is expected for d3, d5 (high spin), d6 (low spin) and d8 configurations.
		In these cases a static Jahn-Teller effect can be observed and the species of D4h symmetry can exist in a solid phase.
		Much weaker stabilization corresponds to the case of the asymmetrically filled former t2g level such as in d1 species.
	www.chem.umd.edu /groups/vedernikov/Lecture2005-30n.ppt (1016 words)

	Visualization of the Molecular Jahn-Teller Effect in an Insulating K4C60 Monolayer -- Wachowiak et al. 310 (5747): 468 ... (Site not responding. Last check: 2007-10-25)
		Visualization of the Molecular Jahn-Teller Effect in an Insulating K4C60 Monolayer -- Wachowiak et al.
		Jump to: Page Content, Section Navigation, Site Navigation, Site Search, Account Information, or Site Tools.
		Visualization of the Molecular Jahn-Teller Effect in an Insulating K
	www.sciencemag.org /cgi/content/abstract/310/5747/468 (232 words)

	Modern Aspects of the Jahn-Teller Effect Theory and Applications To Molecular Problems
		Modern Aspects of the Jahn-Teller Effect Theory and Applications To Molecular Problems
		A.The Role and Place of Jahn-Teller Vibronic Coupling Effects in Theoretical Chemistry
		B.What Is and Is Not Considered in This Review
	pubs.acs.org /cgi-bin/abstract.cgi/chreay/2001/101/i04/abs/cr0004411.html (148 words)

	List of the publications written by J. Weber et al. (Site not responding. Last check: 2007-10-25)
		Density-functional investigation of the excited state properties and the Jahn-Teller effect in [CrX
		Kohn-Sham equations with constrained electron density : the effect of various kinetic energy functional parametrizations on the ground state molecular properties
		Analysis of paramagnetic NMR spectra of triple-helical lanthanide complexes with 2,6-dipocolinic acid revisited : a new assignment of structural changes and crystal-field effects 25 years later
	lcta.unige.ch /LCTA/publications.html (2500 words)

	The Jahn-Teller 2000 Symposium: Invited Speakers (Site not responding. Last check: 2007-10-25)
		Unusual Peierls Effect in MMX Chains: Quantumchemical and Model Analysis.
		The JTE: A Permanent Presence in the Frontiers of Science
		Los Alamos National Laboratory, U. Jahn- Teller Effect in Transition Metal Oxides
	physics.bu.edu /JTS2000/speakers.html (369 words)

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