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103 papers · 1 filter
Jets, knots and tails in planetary nebulae: NGC 3918, K 1-2 and Wray 17-1
Romano L. M. Corradi, Mario Perinotto, Eva Villaver +2
We analyze optical images and high-resolution, long-slit spectra of three planetary nebulae which possess collimated, low-ionization features. NGC 3918 is composed of an inner, spi…
High-velocity collimated outflows in planetary nebulae: NGC 6337, He 2-186, and K 4-47
Romano L. M. Corradi, Denise R. Goncalves, Eva Villaver +4
We have obtained narrow-band images and high-resolution spectra of the planetary nebulae NGC 6337, He 2-186, and K 4-47, with the aim of investigating the relation between their ma…
Landau Zener method to study quantum phase interference of Fe8 molecular nanomagnets
W. Wernsdorfer, R. Sessoli, A. Caneschi +3
We present details about an experimental method based on the Landau Zener model which allows to measure very small tunnel splittings in molecular clusters Fe8. The measurements…
Quantum Hole Digging in Magnetic Molecular Clusters
W. Wernsdorfer, T. Ohm, C. Sangregorio +3
Below 360 mK, Fe8 magnetic molecular clusters are in the pure quantum relaxation regime. We showed recently that the predicted ``square-root time'' relaxation is obeyed, allowing u…
Quantum Phase Interference in Magnetic Molecular Clusters
W. Wernsdorfer, I. Chiorescu, R. Sessoli +2
The Landau Zener model has recently been used to measure very small tunnel splittings in molecular clusters of Fe8, which at low temperature behaves like a nanomagnet with a spin g…
Diophantine conditions and real or complex Brjuno functions
P. Moussa, S. Marmi
The continued fraction expansion of the real number $x=a_0+x_0, a_0\in {\ZZ},$ is given by $0\leq x_n<1, x_{n}^{-1}=a_{n+1}+ x_{n+1}, a_{n+1}\in {\NN},$ for The Brjuno f…