DR2 First Analysis#

  • Anita meeting: 14/03/2023

This week I have performed the DR2 Notebook for:

  • Water Samples

  • Ethane

  • Ethane + ASW

I have also fixed the Data_Analysis_Binder Notebook, that is now working on my local machine (not on the binder cloud system)

Below is a first (rough analysis of what I observed)

Water#

Reference Sample#

2020_09_28

  • Deposition Temperature: 20 K

  • Deposition time: 20 min

  • Deposition pressure: 1 * 10-7 mbar

  • Thickness: ?

  • Ramp: 4 scans per temperature step (1 annealing and 3 isotherm)

Note

How can I convert µm thickness into monolayer (ML)

../../../_images/DR2_2020_09_28_A.png

Fig. 53 Caption#

OH Stretch peak evolution#

Frequency

../../../_images/DR2_2020_09_28_PeakA-frequency_shift_no_legend.png

Fig. 54 Caption#

Legend
../../../_images/DR2_2020_09_28_PeakA-frequency_shift_legend.png

Fig. 55 Caption#

Intesity

../../../_images/DR2_2020_09_28_PeakA-Intensity_shift_no_legend.png

Fig. 56 Caption#

Legend
../../../_images/DR2_2020_09_28_PeakA-Intensity_shift_legend.png

Fig. 57 Caption#

Observations#

  • The peak intensity fluctuate a lot (+- 5 cm-1)

Comparison#

Litterature#
This work#

  • Changes happening at 135 K (bellow glass transition)

    • insert right plot

2020_10_15#

  • Big change at 140 K (nothing seen at 135)

C2H6#

Ethane Ice phases

  • Crystaline

  • Amorphous

  • Clathrate

C2H6/ASW#

2021/03/08#

  • Dodgy sample (CO2 contamination + unsmoothed sample)

  • We can observe that some ethane remain embeded within the ice during all the annealing step (Embeded into the pores)

  • Big peak growing at (?)

../../../_images/DR2_2021_03_08_A.png

Fig. 58 Caption#

../../../_images/DR2_2021_03_08_PeakA-frequency_shift_no_legend.png

Fig. 59 Caption#

Note

A more friendly view of the sample (splitted by the different ranges) will be generated during the data-processing phase

2021/03/24#

  • (C2H6:ASW 1:1 Mixture)

  • Step to 130K

Again, dodgy sample with some unsmoothed scans

Note

Will need to put something in place to take care of those

ie (in the processing phase)

2021/07/16#

Nice sample but lots of CO2 contamination

Note

would that influence the sample signal

  • No because it is only the detector box that is contaminated and not the chamber itself

How can I supress that contribution

2021/09/20#

  • Layered sample.

Note

Is there still some ethane present at high temperature ?

We dont see a modification of the OH stretch as is happening for the codeposition samples above.

OK sample (some CO2 contamination but contained)

Not too much ethane though

2021/10/04#

Very Intersting sample

Warning

Is the peak growing when we go down in temperature the same as the one that grow when we have codeposition of ASW + ethane

  • What would that mean ?

Insert plots

2021/10/07#

Scan 3,4,5 very interesting dangling bond feature, is it due to CO2 contamination