Fluorolog-3 v. 2.2 (10 Sep 2002)
Components & Accessories
6-6
Note:
If condensation ap-
pears on the outside of the
Dewar flask, it must be
re-evacuated.
FL-1013 Liquid Nitrogen Dewar Assembly
For phosphorescence or delayed fluorescence measurements, samples are often frozen
at liquid-nitrogen temperature (77 K) to preserve the fragile triplet state. The sample is
placed in the quartz cell and slowly immersed in the liquid-nitrogen-filled Dewar flask.
The white Teflon
®
cone in the bottom of the Dewar flask keeps the quartz sample-tube
centered in the Dewar flask. The Teflon
®
cover on the top of the Dewar flask holds any
excess liquid nitrogen that bubbled out of the assembly. A pedestal holds the Dewar
flask in the sampling module. A special stove-pipe sample cover replaces the standard
sample lid, so that liquid nitrogen can be added to the Dewar flask as needed. The De-
war flask holds liquid nitrogen for at least 30 min with minimal outside condensation
and bubbling.
FL-1013 Liquid Nitrogen Dewar Assembly.
Included in the FL-1013 Liquid Nitro-
gen Dewar Assembly, the Dewar flask
can be purchased as a spare. The bottom
portion, which sits directly in the light
path, is constructed of fused silica.
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