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

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.

本数据集所用球形冰粒子通过SPIPA-B装置将质量分数为5%的氯化镁（MgCl₂）盐溶液液滴喷入液氮中制备而成。随后将由该类粒子构成的厘米级厚度样品置入SCITEAS-2模拟舱内，并借助可见光-近红外（VIS-NIR）高光谱成像技术，对该样品在低温及次级真空环境下的缓慢升华过程开展数十小时的连续观测。样品表面温度通过热电堆传感器持续监测，该传感器可采集远红外波段的热辐射信号。