CO2 snow with 0.1% H2O ice | GhoSST

Sample

Database

Experimentalists

Origin of sample

Thickness: 60.5 $\pm$ 2.5 $mm$
Diameter: 80.0 $mm$
Volume: 312000.0 $mm^3$
Substrate material: cooper
Substrate comments: cylindrical 80mm diameter, 60mm deep
Comments: the CO2+H2O mixture is deposited over 5mm of martian analogue dust

Type

molecular gas

Fluids

Fluid temperature

148.15

\pm

$\pm$ 0.5

K

$K$

Fluid pressure

6.47

\pm

$\pm$ 0.03

m b a r

$mbar$

Publications

Number

Arrangement

CO2+H2O snow mixture deposited over a 5 mm thick flat layer of martian analogue dust

Layers

Title

preparation of the mixture of CO2 snow and H2O ice

Matters

Sample

CO2 snow with 0.1% H2O ice (this sample)

Processing steps

Step	Chronology	Date	Type	Process	Changes
#1	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
#2	before layer formation	2015-01-01	mechanical	grinding CO2 snow	150µm powdered $CO_2$ snow (contain minor amount of H2O frost: ~0.03%)
#3	before layer formation	2015-01-01	fluid physical	spraying small liquid H2O droplets on CO2 snow in cold chamber (-4°C)	CO2 snow with frozen H2O ice droplets (weighted to determine the H2O mass fraction: 0.1% added)
#4	before layer formation	2015-01-01	mixing	mixing CO2 snow with H2O ice	mixture of CO2 snow and H2O ice
#5	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)
#6	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
#7	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

a very thin and very fine grained (~1µm) layer of water frost may condense on the sample during closure of the cryogenic cell