Refractive index of acetone, heptane, methanol, ethanol
texnic
I wonder if anyone can point me to a source of refractive index data
of acetone, heptane, methanol, ethanol in the range of 800...1100 nm.
The data (except for heptane) is readily available till 800...830 nm,
but not beyond that. There was an old (1990ers) post in this group
pointing to a Russian-American measurement of refractive index of a
few liquids, but they didn't measure these ones.
Thanks in advance!
Kotya
Salmon Egg
<a0f7f412-34e2-42fa...@l30g2000vbn.googlegroups.com>,
texnic <kotya.ka...@gmail.com> wrote:
How have you searched so far? Rubber Handbook? Critical Tables?
Landolt-Bornstein (sp)? Chemical Abstracts?
Bill
--
If inflation is under control, why is my dollar now worth only 2¢ of my youth?
I considered huge valuegains for electronics.
texnic
> Landolt-Bornstein (sp)? Chemical Abstracts?
I've searched on the internet and in the papers. Thought that if those
would be available, they should have been measured by someone. But
apart from doi:10.1117/12.188006 and therein cited doi:
10.1117/12.165230 there is nothing. The authors haven't published any
ethanol, methanol or acetone data however (probably because they were
not interesting from their point of view).
I'll check the references you mentioned. Thanks.
Kotya
brakadabras
> > How have you searched so far? Rubber Handbook? Critical Tables?
> > Landolt-Bornstein (sp)? Chemical Abstracts?
>
>
> I'll check the references you mentioned. Thanks.
Look for an old edition of Handbook of Optics circa 1978. This book is
filled with tables. It might have refractive indexes of your liquids
in NIR.
texnic
> Landolt-Bornstein (sp)? Chemical Abstracts?
>
> filled with tables. It might have refractive indexes of your liquids
> in NIR.
In vain. It seems chemists do not care about IR or, perhaps,
dispersion in general. All reference books (saw Handbook of Optics,
CRC Handbook, Landolt-Boernstein) give refractive indices at 589 nm,
if any at all. I was unable to check the current versions of the
Critical Tables and Chemical Abstracts, though.
However am I wrong to think that if the dispersion values have been
measured, they should have been published in papers as well? Besides
those Russian measurements that do not include "my" liquids and the
Rheims measurement cited in refractiveindex.info, which doesn't go
beyond 830 nm, I couldn't find anything.
The heptane refractive index is probably available in the Industrial
Solvents Handbook, but we don't have access to it. I wonder if anyone
here has. It's all here http://www.knovel.com/web/portal/main and the
search terms are 'acetone (ethanol, methanol, heptane) refractive
index'
p.ki...@ic.ac.uk
> The heptane refractive index is probably available in the Industrial
> Solvents Handbook, but we don't have access to it. I wonder if anyone
> here has. It's all here http://www.knovel.com/web/portal/main and the
> search terms are 'acetone (ethanol, methanol, heptane) refractive
> index'
From a quick scan online, the ISH has single "Literature values" of
refractive index only (I looked at just acetone and heptane).
--
---------------------------------+---------------------------------
Dr. Paul Kinsler
Blackett Laboratory (Photonics) (ph) +44-20-759-47734 (fax) 47714
Imperial College London, Dr.Paul...@physics.org
SW7 2AZ, United Kingdom. http://www.qols.ph.ic.ac.uk/~kinsle/
texnic
> texnic <kotya.karapet...@gmail.com> wrote:
> > The heptane refractive index is probably available in the Industrial
> > Solvents Handbook, but we don't have access to it. I wonder if anyone
> > search terms are 'acetone (ethanol, methanol, heptane) refractive
> > index'
>
> From a quick scan online, the ISH has single "Literature values" of
> refractive index only (I looked at just acetone and heptane).
Paul, thanks a lot! That's what I suspect already and what is once
again confirmed. The publishers want hundreds of euros for their
reference books, and unless I buy all of them, I cannot be sure that
the value is not known.
So I hope my search for scientific publications where the measurements
would have been reported is enough to conclude these values are
unknown. Now we have to decide what to do next.
I wonder if there are commercial devices to precisely measure the
refractive index in near-IR. Then may be we could ask the
manufacturers to measure these liquids for us...
texnic
http://physics.stackexchange.com/questions/10271/refractive-index-of-organic-solvents-in-near-infrared:
Steve B wrote:
> I can't find any tabulation.
>
> You can do a Sellmeier equation fit from visible data and extrapolate it to near-IR. BUT, the visible index is determined by the UV absorptions, so the extrapolation will only be reliable as long as you are much closer to the UV absorption bands than to the IR absorption bands. Since these solvents all have pretty strong high-frequency IR bands (CH stretch and OH stretch around 3um), you probably shouldn't extrapolate past 1um or so. (That's just a guess.)
>
> I can't really say any more unless I know how accurate you need (what application) and what wavelength range you're interested in. You can figure everything out with an FTIR, but it can be a bit complicated.
>
> ADDENDUM: If you calculate the index of refraction in the range 850nm-2.5um by extrapolating from the visible, you will overestimate it. The longer the wavelength, the more severe the overestimation. That's because the effect of a resonance, e.g. the CH stretch resonance, is to increase the refractive index for wavelengths longer than the resonance wavelength, and decrease the refractive index for wavelengths shorter than the resonance wavelength. Since your extrapolation from the visible would ignore the IR resonances, it would be an overestimate.