- Title
- Ion irradiation ($He^+$, $Ar^+$) of a Murchison meteorite pellets probed by Raman spectroscopy
- DOI
- 10.26302/SSHADE/EXPERIMENT_RB_20130101_002
- Data reference
- Brunetto, Rosario (2013): Ion irradiation ($He^+$, $Ar^+$) of a Murchison meteorite pellets probed by Raman spectroscopy. SSHADE/DAYSY (OSUG Data Center). Dataset/Spectral Data. https://doi.org/10.26302/SSHADE/EXPERIMENT_RB_20130101_002
- Publications
- Database(s)
- Experimentalists
- Type(s)
- laboratory measurement
- Description
- Raman spectra of pellets 1 and 2 of the Murchison meteorite, with different irradiation spots on the surface. Raman micro-spectroscopy was performed at the SMIS beamline at SOLEIL using a DXR Raman micro-spectrometer from Thermo Fisher with a 532 nm exciting laser radiation, and a power on the sample lower than 0.3 mW, producing power densities lower than 300 $W/mm^2$.
- Number of spectra
- 6
- Variable type(s)
-
- irradiation dose
- Comments
- We irradiated two pellets of Murchison 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
- Thermo DXR - Raman
- 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 #1 902.0 - 1798.0 0.964 4.0 1.0 - Comments
- Raman shift with respect to laser at 532 nm
- Comments
- Confocal measurement with a x50 objective at long working distance
- Observation mode
- averaged
- Spots number
- 50
- Objective type
- x50
- Image size
- 1.0 x 1.0 ${\mu}m$
- Comments
- We recorded Raman maps of the different areas (virgin and irradiated) on the pellets to better cope with surface heterogeneity issues
- Date begin - end
- 2013-01-01 - 2013-12-31
Versions
- Release date
- 2018-01-31 23:51:01+0000 UTC
- Version (Date)
- #1 (2018-01-31 23:51:01+0000 UTC, Updated: 2018-09-27 16:05:43+0000 UTC)
