CO2 snow with 0.10% of a PAH mix | CSS

Sample

Database

Experimentalists

Origin of sample

Mass: 31.0327 $\pm$ 1.5001 $g$
Sample changes: $CO_2$ sublimation: sample thickness decreased before spectrum - possible increase of PAH concentration
Substrate material: aluminium
Substrate comments: cylindrical 48mm diameter, 20mm deep
Comments: sublimating sample with an initial thickness of 20 mm decreasing with time

Type

molecular gas

Fluids

Fluid temperature

173.0

\pm

$\pm$ 2.0

K

$K$

Fluid pressure

6.0

\pm

$\pm$ 0.5

m b a r

$mbar$

Source: Quartz-Tungsten lamp
Chronology: before spectrum
Irradiation time: 33.0 $\pm$ 1.0 $min$
Comments: illuminate surface with halogen office lamp. Lamp-window distance is 24 cm

Number

Layers

Title

preparation of a mixture of PAH and CO2 snow

Matters

Sample

CO2 snow with 0.10% of a PAH mix (this sample)

Processing steps

Step	Chronology	Date	Type	Process	Changes
#1	before layer formation		mixing	mixing a weighted amount of PAHs mix with CO2 ice in a liquid N2 cooled stainless steel bowl	the final mixture of CO2 ice and PAH is weighted to determine the PAH mass fraction
#2	before layer formation		layer formation	filling the liq N2 cooled cell with the PAHs/CO2 ice mixture, plus some manual densification and surface flattening	flat homogeneous PAHs/CO2 ice mixture sample

Comments

some very thin and very fine grained layer of water ice may condense on the sample during closure of the cryogenic cell