Experiment
Title
Ion irradiation ($He^+$, $Ar^+$) of an Allende meteorite pellet probed by IR spectroscopy in the MIR range
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.
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
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 (2017-07-07 11:16:42 UTC+0000, Updated: 2019-10-26 10:01:20 UTC+0000)