Re: spectral line identification (approx. 670 nm)
- From: tadchem <tadchem@xxxxxxxxxxx>
- Date: Sun, 28 Sep 2008 08:11:18 -0700 (PDT)
On Sep 28, 5:42 am, dudi24 <sven.dud...@xxxxxx> wrote:
Thanks for your answers.
On 26 Sep., 19:55, Uncle Al <Uncle...@xxxxxxxxxxxxx> wrote:
You want high purity graphite (http://www.poco.com/, nuclear grade,
maybe Grafoil) not an artist's pencil. Commercial graphite is
typcally boron-contaminated as a processing aid. Silicon is also
common.
The main purpose of the experiment was not to get a pure carbon-
spectrum. I used the graphite of the pencil to simulate material
impurities while welding and shot the laser on the pencil itself to
get some kind of reference spectrum.
The information about the boron and silicon might be usefull.
Check out fullerene gas phase spectra and carbon-based astronomic
lines including comet tails (Swan bands).
I'll have a look.
Thanks,
Sven
Please be advised that most pencil graphite consists of graphite
powder has been admixed with clay as a binder, with the proportion of
clay being used to control hardness. The chemical composition of clay
is not simple. Typically they contain alkali metals (your sodium and
potassium), alkaline earths, with aluminum and silicon as
aluminosilicates without as fixed composition.
Tom Davidson
Richmond, VA
.
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