Hello,
We would like to perform low temperature absorption experiments on a liquid sample placed in a cryostat. Our particular cryostat has the sample in vacuum. To start cooling, we have to pump the vacuum chamber where the sample sits before cooling. So if there is any liquid in there, the liquid will simply evaporate/degas. I would like to know if there are special cells that can seal and withstand negative pressure (so it won’t pop when the vacuum chamber is pumped).
Any feedback is appreciated.
Thank-you
Hello,
these cells are very bulky (i'm not sure you have enough space in your cryostat), but they are made of materials used at low temperatures
http://www.themcnab.com/products/modular_optical_cell/mcnab_modular_optical_cell.htm
It would be better to try these cells
http://www.internationalcrystal.net/type1sc.htm
you should change a screw cap for another made of Teflon (with the same sizes).
to seal a cell you may be needed a Teflon band (to wind it around a srew-thread).
quarts and Teflon are good for low temperatures.
good luck!
Is optical absorption what you want to do? Does the transmission of the windows play an essential role? For in-vacuum applications involving VUV and soft x-rays, people (including myself) have successfully used silicon nitride membranes. Thesehave a funite risk of failure though. There might thus be the need for an interlock system protecting sensitive vacuum instrumentation following failure.
Also, with whatever cell: if your liquid freezes, mind the possible volume change and concomitant mechanical stress on components, especially windows.
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