horiba FluoroMax-3, Operation Manual, Page: 166 / 220

FluoroMax-3 v. 3.1 (7 Mar 2006) Components & Accessories
12-6
Note:
If condensation appears on
the outside of the Dewar flask, it
must be re-evacuated.
Warning
:
Refer to your Material Safety Data Sheet
(MSDS) for information on the hazards of cryogenic
materials such as liquid nitrogen.
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 sam-
ple-tube centered in the Dewar flask. The Teflon
®
cover on the top of the Dewar flask holds any ex-
cess liquid nitrogen that bubbled out of the as-
sembly. A pedestal holds the Dewar flask in the
sampling module. A special stove-pipe sample
cover replaces the standard sample lid, so that liq-
uid nitrogen can be added to the Dewar flask as
needed. The Dewar flask holds liquid nitrogen for
at least 30 min with minimal outside condensation
and bubbling.
Included in the FL-1013 Liquid Nitrogen 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.
FL-1013 Liquid Nitrogen
Dewar Assembly.