- Title
- Ion irradiation ($He^+$, $Ar^+$) of an Allende meteorite pellet probed by IR spectroscopy in the MIR range
- DOI
- 10.26302/SSHADE/EXPERIMENT_RB_20130101_003
- Data reference
- Brunetto, Rosario (2013): Ion irradiation ($He^+$, $Ar^+$) of an Allende meteorite pellet probed by IR spectroscopy in the MIR range. SSHADE/DAYSY (OSUG Data Center). Dataset/Spectral Data. https://doi.org/10.26302/SSHADE/EXPERIMENT_RB_20130101_003
- Publications
- Database(s)
- Experimentalists
- Type(s)
- laboratory measurement
- Description
- Mid-IR spectra of pellet n°2 of the Allende meteorite, with different irradiation spots on the surface.
- Number of spectra
- 3
- Variable type(s)
-
- irradiation dose
- Comments
- We irradiated two pellets of Allende using the SIDONIE isotope separator in CSNSM, Orsay, using $He^+$ and $Ar^+$ ions at 40 keV. Sample were mounted vertically and ion irradiation was performed at normal incidence. We produced four separate irradiation spots (4 mm in diameter each) on each pellet, using different fluences: $5 10^{14}, 2 10^{15}, 1 10^{16}, 3 10^{16}$ for $He^+$ ions $cm^{-2}$, and 1 10^{14}, 5 10^{14}, 2 10^{15}, 6 10^{15} for $Ar^+$ ions $cm^{-2}$. Earlier irradiated spots were masked to protect them from contamination of sputter deposits from the subsequent irradiation steps. A central area (diameter 2 mm) of each pellet remained non-irradiated.
- Instrument
- SMIS NEXUS 6700 - confocal reflexion Mid-IR
- Sample holder
- samples mounted horizontally on X-Y stage of microscope
- Standard medium
- vacuum
- Observation mode
- spectrum
- Spectral range type(s)
- MIR
- Valid spectral range(s)
-
Min - Max ($cm^{-1}$) Sampling ($cm^{-1}$) Resolution ($cm^{-1}$) Position accuracy ($cm^{-1}$) Absorption edge #1 740.0 - 1020.0 0.96425 2.0 1.0
Definition: incidence and emergence angles are positive with origin at nadir, and vary in same direction. Azimuth origin (increasing clockwise) is for i = e (opposition geometry).
- Observation geometry
- biconical
- Observation mode
- fixed angles
- Comments
- Confocal measurement with a x50 objective at long working distance
- Observation mode
- averaged
- Spots number
- 25
- Objective type
- x32
- Image size
- 15.0 x 15.0 ${\mu}m$
- Date begin - end
- 2013-01-01 - 2013-12-31
Versions
- Release date
- 2018-01-31 23:51:01 UTC+0000
- Version (Date)
- #1 (2018-01-31 23:51:01 UTC+0000, Updated: 2019-10-26 10:01:20 UTC+0000)