52 research outputs found
Surprises in the Orbital Magnetic Moment and g-Factor of the Dynamic Jahn-Teller Ion C_{60}^-
We calculate the magnetic susceptibility and g-factor of the isolated
C_{60}^- ion at zero temperature, with a proper treatment of the dynamical
Jahn-Teller effect, and of the associated orbital angular momentum, Ham-reduced
gyromagnetic ratio, and molecular spin-orbit coupling. A number of surprises
emerge. First, the predicted molecular spin-orbit splitting is two orders of
magnitude smaller than in the bare carbon atom, due to the large radius of
curvature of the molecule. Second, this reduced spin-orbit splitting is
comparable to Zeeman energies, for instance, in X-band EPR at 3.39KGauss, and a
field dependence of the g-factor is predicted. Third, the orbital gyromagnetic
factor is strongly reduced by vibron coupling, and so therefore are the
effective weak-field g-factors of all low-lying states. In particular, the
ground-state doublet of C_{60}^- is predicted to show a negative g-factor of
\sim -0.1.Comment: 19 pages RevTex, 2 postscript figures include
Far-infrared study of the Jahn-Teller distorted C60 monoanion in C60 tetraphenylphosphoniumiodide
We report high-resolution far-infrared transmission measurements on C(60)-tetraphenylphosphoniumiodide as a function of temperature. In the spectral region investigated (20-650 cm(-1)), we assign intramolecular modes of the C(60) monoanion and identify low-frequency combination modes. The well-known F(1u)(1) and F(1u)(2) modes are split into doublers at room temperature, indicating a D(5d) or D(3d) distorted ball. This result is consistent with a dynamic Jahn-Teller effect in the strong-coupling limit or with a static distortion stabilized by low-symmetry perturbations. The appearance of silent odd modes is in keeping with symmetry reduction of the hall, while activation of even modes is attributed to interband electron-phonon coupling and orientational disorder in the fulleride salt. Temperature dependences reveal a weak transition in the region 125-150 K in both C(60)(-) and counterion modes, indicating a bulk, rather than solely molecular, effect. Anomalous softening (with decreasing temperature) in several modes may correlate with the radial character of those vibrations. [S0163-1829(98)03245-7]
Biofilm formation and antibiotic production in <em>Ruegeria mobilis</em> are influenced by intracellular concentrations of cyclic dimeric guanosinmonophosphate
Persistent photoinduced electron transfer from functionalized dendrimers to Buckminsterfullerene
ChemInform Abstract: CHLORINE PERCHLORATE A MAJOR PHOTOLYSIS PRODUCT OF CHLORINE DIOXIDE
Chlorine perchlorate. A major photolysis product of chlorine dioxide
Gaseous chlorine perchlorate, ClOClO3, is found to be a major photolysis product of chlorine dioxide (OClO). Experiments were performed at room temperature with both continuous wave (mercury lamp) and pulsed (XeCl UV laser) light sources. The technique of time-resolved IR spectral photography (TRISP) was used to monitor the growth of the strong 1282-cm-1 ClOClO3 IR band following the application of a single ∼35 ns long, ∼70 mJ/cm2, XeCl laser pulse to a mixture of ∼30 torr of OClO and ∼700 torr of N2. It was found that under these conditions this band forms with a time constant of ∼1 μs. A transient IR band of unknown origin at ∼1232 cm-1 was also observed to develop on the same time scale. © 1982 American Chemical Society
Describing isotropic and anisotropic out-of-plane deformations in thin cubic materials by use of Zernike polynomials
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