VIS-NIR reflectance spectra collected during low-temperature and near-vacuum sublimation of spherical salty ice particles (67 µm average diameter) produced by freezing droplets of a solution of 5wt.% MgCl2 | BYPASS

Experiment

Title: VIS-NIR reflectance spectra collected during low-temperature and near-vacuum sublimation of spherical salty ice particles (67 µm average diameter) produced by freezing droplets of a solution of 5wt.% MgCl2

DOI

10.26302/SSHADE/EXPERIMENT_RO_20240328_000

Data reference

Ottersberg, Rafael (2024): VIS-NIR reflectance spectra collected during low-temperature and near-vacuum sublimation of spherical salty ice particles (67 µm average diameter) produced by freezing droplets of a solution of 5wt.% MgCl2. SSHADE/BYPASS (OSUG Data Center). Dataset/Spectral Data. https://doi.org/10.26302/SSHADE/EXPERIMENT_RO_20240328_000

Publications

Ottersberg et al., 2025, Icarus

Owner

Database(s)

BYPASS

Experimentalists

Rafael Ottersberg

Spectra preview

Experiment type

Type(s): laboratory measurement
Description: Spherical ice particles are produced by spraying droplets of salt solution (5 wt.% MgCl2) into liquid nitrogen with the SPIPA-B setup. A centimeter-thick sample made of these particles is then introduced in the SCITEAS-2 simulation chamber and its slow sublimation at low temperature and in secondary vacuum is followed for several tens of hours by VIS-NIR hyperspectral imaging. The surface temperature of the sample is monitored continuously using a thermopile sensor, which measures the thermal emission in the far infrared.
Number of spectra: 68

Variable parameters

Variable type(s)

time
temperature
pressure

Location

Laboratory: Space Research & Planetary Sciences Division of the University of Bern (WP Unibe)

Instrument #1

Instrument: MoHIS - Hyperspectral imaging system Vis-NIR

Spectral parameters

Standard medium

vacuum

Observation mode

spectrum

Spectral range type(s)

Vis, NIR

Valid spectral range(s)

	Min - Max ( $nm$ )	Sampling ( $nm$ )	Resolution ( $nm$ )	Position accuracy ( $nm$ )	Absorption edge
#1	400.0 - 2000.0	5.0	5.4
#2	2000.0 - 2400.0	5.0	10.8

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: biconical
Observation mode: fixed angles
Incidence angle: 0.0°
Emergence angle: 5.0°
Azimuth angle: 0.0°
Phase angle: 5.0°

Spatial parameters

Observation mode: roi averaged

History

Date begin - end: 2024-03-28 - 2024-04-04

Versions

Release date: 2025-04-17 15:46:02+0000 UTC
Version (Date): #1 (2025-04-17 15:46:02+0000 UTC, Updated: 2025-04-17 15:46:02+0000 UTC)

Image

View of the sample in the simulation chamber at the beginning of the experiment. All reflectance spectra shown here are integrated over the ROI drawn in red over the sample.