Welcome
to the Experimental Astrophysics Laboratory
at
Catania Astrophysical
Observatory, Italy
|
Last update of this page was:
|
|
|
In
this section, we provide diffuse reflectance spectra of HED
meteorites (Bereba and Dar al Gani 684) irradiated by Ar+
and C+
ions. Experiments are a simulation of space weathering of Vesta and
V-type asteroids. We collected hemispherical reflectance spectra in
the spectral range 0.4-2.5 µm (resolution 2 nm) of unirradiated
and irradiated samples using a VIS-NIR spectrometer (Perkin Elmer -
Lambda 19) equipped with an integrating sphere in BaSO4.
Meteorite spectra were referred to a blank spectrum of a standard
BaSO4.
The error in the reflectance spectra is of about 5%. More details on
the experiments and samples are given in Table 1 and Fulvio et al.,
2012 (Astronomy and Astrophysics, 2012 in press). Please refer to
this paper when using these spectra. Pellet ion Energy (keV) Tot.
fluence (ions/cm2) Scaled
BI slope (µm-1) Scaled
BI slope error (µm-1) foldername DaG
1 Ar+ 200 8x1016 0.103 0.015 DaG
2 Ar+ 60 2.5x1017 0.08 0.015 Bereba
1 (b) Ar+ C+ 200 200 4.35x1017 a.b.
+ 3.5x1015 0.187 0.262 0.010 0.015 Bereba
2 (a) Bereba 2 (b) Bereba 2 (c) Bereba 2 (d) Ar+ C+ C+ C+ 200 200 200 200 5x1016 a.b.
+ 3x1015 8x1015 2.3x1016 0.015 0.095 0.158 0.258 0.010 0.014 0.013 0.018 DaG
3 (a) DaG
3 (b) DaG
3 (c) DaG
3 (d) DaG
3 (e) Ar+ C+ Ar+ C+ C+ 200 200 200 200 200 5x1016 a.b.
+ 3x1015 a.b.
+ 2x1016 a.b.
+ 8x1015 1.3x1016 0.040 0.138 0.168 0.363 0.506 0.015 0.015 0.014 0.019 0.027 Table
1.
Bereba and Dar Al Gani 684 (here referred to as DaG) pellets along
with used ions, energy, total fluence, BI slopes scaled to the
initial value (i.e., slope of the irradiated spectrum - slope of the
virgin one), BI slope error, and link to the folder from where it is
possible to download the spectra. When considering consecutive
irradiation steps with the same ion, the total fluence reached with
that ion is reported. When a pellet was consecutively irradiated with
different ions, ``a.b." (= as before) appears in the row where
the irradiation with the new ion is considered. In that case, the
fluence following the ``a.b." label is the one with the new ion
(to be added to the previous value). Fig. 1
. VIS-NIR reflectance spectra of Dar Al Gani 684 pellet 1 and 2,
before and after irradiation. Spectra in original hemispherical
reflectance. Fig.
2. VIS-NIR reflectance spectra of Bereba pellet 1 and Bereba pellet
2, before and after irradiation. Spectra
in original hemispherical reflectance. Fig.
3. VIS-NIR reflectance spectra of Dar Al Gani 684 pellet 3, before
and after multiple irradiation steps with different ions and
fluences. Spectra
in original hemispherical reflectance. |
||||||||||||||||||||||||||||||||||||||||||
|
|
WebEditors GLe e FS e-mail
gle@oact.inaf.it
