Ion irradiation (He^+) of a FRO95002 meteorite pellet probed by NIR spectroscopy | DAYSY

Experiment

Title: Ion irradiation ( $He^+$ ) of a FRO95002 meteorite pellet probed by NIR spectroscopy

DOI

10.26302/SSHADE/EXPERIMENT_CL_20181202_01

Data reference

Lantz, Cateline (2015): Ion irradiation (

H e^{+}

$He^+$ ) of a FRO95002 meteorite pellet probed by NIR spectroscopy. SSHADE/DAYSY (OSUG Data Center). Dataset/Spectral Data. https://doi.org/10.26302/SSHADE/EXPERIMENT_CL_20181202_01

Publications

Lantz et al., 2017, Icarus, 285, 43 - 57

Owner

Database(s)

DAYSY

Experimentalists

Cateline Lantz

Spectra preview

Experiment type

Type(s): laboratory measurement
Description: NIR spectra of FRO95002 meteorite pellet, before and after ion irradiation at different doses.
Number of spectra: 5

Variable parameters

Variable type(s)

irradiation dose

Comments

We irradiated one pellet of FRO95002 meteorite on the IRMA platforme (CSNSM, Orsay), using

H e^{+}

$He^+$ 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} a n d {6.10}^{16} i o n s . c m - 2

$5.10^{15}, 1.10^{16}, 3.10^{16} and 6.10^{16} ions.cm{-2}$ . 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.

Location

Laboratory: Institut d'Astrophysique Spatiale (IAS)

Instrument #1

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)

Spectral parameters

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	4011.41 - 11756.5		16.0	1.0

Angular parameters

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: bidirectional
Observation mode: fixed angles
Incidence angle: 20.0°
Emergence angle: 15.0°
Phase angle: 15.0°

Spatial parameters

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).

History

Date begin - end: 2015-03-05 - 2015-03-11

Versions

Release date: 2018-12-02 18:40:55+0000 UTC
Version (Date): #1 (2018-12-02 18:40:55+0000 UTC, Updated: 2018-12-02 20:50:25+0000 UTC)

Image

Image of the FRO95002 pellet after irradiation with the highest dose (

H e^{+}

$He^+$ ions at 40 keV and a total fluence of

{6.10}^{16} i o n s . c m^{- 2}

$6.10^{16} ions.cm^{-2}$ ).