Zobrazeno 1 - 10
of 332
pro vyhledávání: '"Spiegelman F."'
In this paper we emphasize the non-Lorentzian behavior of the Balmer series in helium-dominated DBA white dwarf stars for which the decades-old problem exists for the determination of the hydrogen abundance. In a very recent work, we have shown that
Externí odkaz:
http://arxiv.org/abs/2201.03294
In order to investigate the near wing of the Lyman-alpha line, accurate line profile calculations and molecular data are both required due to the existence of a close line satellite responsible for its asymmetrical shape. Lyman-alpha lines observed w
Externí odkaz:
http://arxiv.org/abs/2201.00878
Spectral observations below Lyman-alpha are now obtained with the Cosmic Origin Spectrograph (COS) on the Hubble Space Telescope (HST). It is therefore necessary to provide an accurate treatment of the blue wing of the Lyman-alpha line that enables c
Externí odkaz:
http://arxiv.org/abs/2106.00766
Publikováno v:
EPJ Web of Conferences, Vol 18, p 06003 (2012)
Quantum Chemistry methods offer powerful tools for the computation of various properties of molecules and nanoparticles or clusters such as structure, thermodynamics, infrared and electronic spectroscopy, in some cases on a routine basis. However, ne
Externí odkaz:
https://doaj.org/article/c302528d26e34d4296677ec0e3e6c408
The opacity of alkali atoms, most importantly of Na and K, plays a crucial role in the atmospheres of brown dwarfs and exoplanets. We present a comprehensive study of NaH2 collisional profiles at temperatures from 500 to 3000 K, the temperatures prev
Externí odkaz:
http://arxiv.org/abs/1908.01989
Autor:
Joblin, C., Dontot, L., Garcia, G. A., Spiegelman, F., Rapacioli, M., Nahon, L., Parneix, P., Pino, T., Bréchignac, P.
Publikováno v:
J. Phys. Chem. Lett., 2017, 8 (15), pp 3697-3702
We report the first experimental measurement of the near-threshold photo-ionization spectra of polycyclic aromatic hydrocarbon clusters made of pyrene C16H10 and coronene C24H12, obtained using imaging photoelectron photoion coincidence spectrometry
Externí odkaz:
http://arxiv.org/abs/1704.05683
The competition between the formation and destruction of coronene clusters under interstellar conditions is investigated theoretically. The unimolecular nucleation of neutral clusters is simulated with an atomic model combining an explicit classical
Externí odkaz:
http://arxiv.org/abs/astro-ph/0609186
Clusters of polycyclic aromatic hydrocarbon (PAH) molecules are modelled using explicit all-atom potentials using a rigid body approximation. The PAH's considered range from pyrene (C10H8) to circumcoronene (C54H18), and clusters containing between 2
Externí odkaz:
http://arxiv.org/abs/physics/0407119
Autor:
Calvo, F., Spiegelman, F.
Melting in Na_n clusters described with an empirical embedded-atom potential has been reexamined in the size range 55<=n<=147 with a special attention at sizes close to 130. Contrary to previous findings, premelting effects are also present at such m
Externí odkaz:
http://arxiv.org/abs/physics/0312049
We investigate theoretically the progressive coating of C60 by several sodium atoms. Density functional calculations using a nonlocal functional are performed for NaC60 and Na2C60 in various configurations. These data are used to construct an empiric
Externí odkaz:
http://arxiv.org/abs/cond-mat/0305654