- Database
- Experimentalists
- Date
- 2017-10-17
- Mass
- 31.0327 $\pm$ 1.5001 $g$
- Sample changes
- $CO_2$ sublimation: sample thickness decreased from 18 to 15 mm during spectrum
- Substrate material
- aluminium
- Substrate comments
- cylindrical 48mm diameter, 20mm deep
- Comments
- sublimating sample with an initial thickness of 20 mm decreasing with time
already 2 mm CO2 sublimated at start of spectrum - possible increase of PAH concentration
- Temperature
- 173.0 $\pm$ 2.0 $K$
- Time at T
- 0.5 $\pm$ 0.5 $h$
- Comments
- sample in cell about 30min before first spectrum, not taken into account in 'time'. Full spectrum takes about 1h
- Type
- molecular gas
- Fluids
-
- $CO_2$ 100.0 %
- Fluid temperature
- 173.0 $\pm$ 2.0 $K$
- Fluid pressure
- 6.0 $\pm$ 0.5 $mbar$
- Number
- 1
- 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