Pure solids or solutions can be analysed. The
sample should be vacuum compatible (no high vapour pressure material
will be allowed). Literature on analysis details (in the case
of known compounds) will be useful. On unknown/new samples, information
on similar samples will be helpful. This reduces the time for
optimizing the spectrometer performance.
Quantity should be of the order of 1 mg (for
pure solids) or about 1 ml (in the case of solutions). For completely
unknown samples, larger quantities are better as several trials
may have to be done.
(1) Dry powder or solution which evaporates on
the TEM grid to form a dry film or (2) a thin film already prepared
on the TEM grid or (3) microtomed biological specimen of <
70 nm thickness, etc. Nothing vacuum incompatible will be analysed.
The typical column vacuum in our machine is < 1x10-5 pa. Samples
which can cause strong beam induced damage should not be submitted
which may harm the instrument. Sample must be submitted in advance
as the grids will be prepared on the previous night (to reduce
pumping time). Supporting information such as XRD / lower resolution
TEM / SEM will be useful for the operator.
Solids, solutions, liquids, thin films. Quantity
should be of the order of 1 mg (for pure solids) or about 1 ml
(in the case of solutions).