Sample
Name
CO2 snow with 1.5% H2O ice
Date
2015-01-01
Provider
IPAG
Thickness
60.5 $\pm$ 2.5 $mm$
Diameter
80.0 $mm$
Volume
312000.0 $mm^3$
Sample changes
$CO_2$ sublimation: initial sample
Substrate material
cooper
Substrate comments
cylindrical 80mm diameter, 60mm deep
Comments
the CO2+H2O mixture is deposited over 5mm of martian analogue dust
Temperature
148.15 $\pm$ 0.5 $K$
Type
molecular gas
Fluids
Fluid temperature
148.15 $\pm$ 0.5 $K$
Fluid pressure
6.47 $\pm$ 0.03 $mbar$
Number
3
Arrangement
CO2+H2O snow mixture deposited over a 5 mm thick flat layer of martian analogue dust
Layers
Title
preparation of a mixture of H2O ice and CO2 snow

Precursors

Matters

Produced sample

Sample
CO2 snow with 0.10% of a PAH mix
Processing steps
Step Chronology Date Type Process Changes
#1 before layer formation 2015-01-01 mechanical grinding a monocrystal of H2O ice in cold chamber (-4°C) powdered H2O ice
#2 before layer formation 2015-01-01 mechanical sieving powdered H2O ice between 250 and 280µm sieves in cold chamber (-4°C) 250-280µm powdered H2O ice
#3 before layer formation 2015-01-01 fluid physical solidification of liquid CO2 droplets by decompression from a CO2 bottle with plunger within the SnowPack (R) device formation of a dense pellet (312.5 cm3) of $CO_2$ snow
#4 before layer formation 2015-01-01 mechanical grinding CO2 snow 150µm powdered $CO_2$ snow (contain minor amount of H2O frost: ~0.03%)
#5 before layer formation 2015-01-01 mixing mixing a weighted amount of sieved H2O ice with CO2 snow mixture of CO2 snow and H2O ice (weighted to determine the H2O mass fraction: 1.5%)
#6 during layer formation 2015-01-01 layer formation filling the CarboN-IR cell at -125°C with 5mm of volcanic tuff plus some manual surface flattening flat homogeneous 5mm thick volcanic tuff layer (grains <25µm)
#7 during layer formation 2015-01-01 layer formation filling the CarboN-IR cell at -125°C with 55mm of CO2 snow + H2O ice mixture plus some manual surface flattening flat 55mm thick homogeneous CO2 snow + H2O ice mixture layer over 5mm thick volcanic tuff layer
#8 after layer formation 2015-01-01 pressure pumping air from the CarboN-IR cell at -125°C CO2 snow + H2O ice sample in thermodynamical equilibrium with CO2 gas
Comments
some very thin and very fine grained layer of water ice may condense on the sample during closure of the cryogenic cell