Experiment
Title
Ion irradiation ($He^+$) of an Alais meteorite pellet probed by NIR spectroscopy
Data reference
Lantz, Cateline (2015): Ion irradiation ($He^+$) of an Alais meteorite pellet probed by NIR spectroscopy. SSHADE/DAYSY (OSUG Data Center). Dataset/Spectral Data.
Publications
Database(s)
Experimentalists
Type(s)
laboratory measurement
Description
NIR spectra of Alais meteorite pellet, before and after ion irradiation at different doses.
Number of spectra
5
Variable type(s)
  • irradiation dose
Comments
We irradiated one pellet of Alais meteorite on the IRMA platforme (CSNSM, Orsay), using $He^+$ ions at 40 keV. The sample was mounted vertically and ion irradiation was performed at normal incidence. The pellet was irradiated at progressively increased fluences: $5.10^{15}, 1.10^{16}, 3.10^{16} and 6.10^{16} ions.cm{-2}$. The whole pellet surface is irradiated at each step except a corona of 500 μm thick on the pellet edge that was hidden by the sample holder.
Instrument
Bruker Tensor - reflection Near-IR
Sample holder
The sample is mounted on a vertical holder in the vacuum chamber of INGMAR setup (IrradiatioN de Glaces et Météorites Analysées par Réflectance VIS-IR, IAS-CSNSM/Orsay)
Standard medium
vacuum
Observation mode
spectrum
Spectral range type(s)
NIR
Valid spectral range(s)
Min - Max ($cm^{-1}$) Sampling ($cm^{-1}$) Resolution ($cm^{-1}$) Position accuracy ($cm^{-1}$) Absorption edge
#1 4011.40844562 - 11756.5316351 16.0 1.0
Observation geometry
bidirectional
Observation mode
fixed angles
Incidence angle
20.0°
Emergence angle
15.0°
Phase angle
15.0°
Observation mode
single spot
Spatial resolution
3000.0 ${\pm}$ 1000.0 ${\mu}m$
Comments
The collecting spot size is 3–4 mm, larger than the pellet heterogeneity, and thus representative of all constituents of the meteorite (matrix and chondrules).
Date begin - end
2015-03-05 - 2015-03-11

Versions

Release date
2018-12-02 18:39:18 UTC+0000
Version (Date)
#1 (2018-12-01 22:48:34 UTC+0000, Updated: 2018-12-02 20:48:57 UTC+0000)