Re: Spectrum of XBO
- From: hcb@xxxxxxxxxxxxxxxx (Hans-Christian Becker)
- Date: 24 May 2007 11:02:25 +0200
In article <1179947285.137938@athprx03>, Ioannis <morpheus@xxxxxxxxxxxx> wrote:
"Hans-Christian Becker" <hcb@xxxxxxxxxxxxxxxx> wrote in message
news:46548cb8$1@xxxxxxxxxxxxxxxxxxxx
As usual, things were a bit more complicated than I first thought. The spectrum
I measure is corrected for the wavelength dependence of the detector, but *not*
for the characteristics of the excitation monochromator. In principle I think
this could be overcome by driving the excitation monochromator to zero order
and using a perfectly white diffusor in the sample chamber---we have correction
factors for the emission monochromator. However, that still leaves the problem
of finding a suitably white object. I think barium oxide deposited on pure
cellulose filter paper is very close to white over a quite large wavelength
range.
Yes, please. Send it over! Is it in .jpg format?I have the data in text format at
http://www.anst.uu.se/habec255/tmp/XBO.txt
and the spectrum as a PDF at
http://www.anst.uu.se/habec255/tmp/XBO.pdf
The caveats are that (1) the spectrum is distorted by the wavelength dependent
transmittance of the monochromator (it is a Jobin-Yvon double monochromator
with gratings blazed at 330 nm, 1 nm slit widths), and (2) second order light,
although probably weak, is not filtered out.
The lamp is a 450 W ozone-free short-arc Xe lamp.
I would say that sounds like a pretty good deal, actually. The lamps aloneThis must be the most expensive lamp I've ever bought: Total cost, supportOuch! From where do you get your lamps?
unit, transformer, lamphouse and lamps: 480 Euros.
Is it expensive? One Zeiss/ludl power supply, one step down transformer
220/110V/150VA, a lamphouse and three XBO 75W/2, (one brand new OSRAM, one
used OSRAM and a third used one)
must be a few hundred Euros, and one would think that the Zeiss power supply
is of good quality.
--
Dr. Hans-Christian Becker
'96 VN750 SM5TLH KG6POK
Uppsala, Sweden
.
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