Re: 780nm absorption line in Iodine molecule

You made your search too narrow.

I found several hits on the spectroscopy of iodine.
Proceedings of SPIE -- Volume 5259
13th Polish-Czech-Slovak Conference on Wave and Quantum Aspects of
Contemporary Optics, Jerzy Nowak, Marek Zajac, Jan Masajada, Editors,
November 2003, pp. 192-195

Near-infrared absorption spectroscopy of dissociated iodine vapor with
semiconductor laser
Petr Jedlicka, Josef Lazar, and Ondrej Cip
Institute of Scientific Instruments (Czech Republic)


We present an experimental arrangement for the investigation of the spectra
of a iodine in the spectral region around 1315 nm. The work was motivated by
the need to assemble a stabilized laser system emitting at the wavelength
matching with the transition used in iodine laser optical amplifiers where
the laser frequency stabilityis limited by the linewidth of this 2P1/2-2P3/2
hyperfine transition. This stabilized laser system followed by an
electro-optic Q-switch and fibre-optic preemplifiers will serve as a master
oscillator for a pulsed high-power laser Asterix IV in the PALS facility.


===========================================

Here is a blog page with picture of apparatus and more:

http://radio.weblogs.com/0101365/stories/2002/11/15/halogenSpectroscopy.html

The iodine spectrum appeared similar to bromine's spectrum, but it appeared
to be shifted toward the red end of the spectrum. The bands were observed
between 600 and 675 nm, and the spectrum cut off at about 600 nm. The bands
appear sharper than were observed in the spectrum of bromine. The picture
below is the spectrum iodine vapor from 540 nm on the left to 775 nm on the
right:

============================================

So it would appear that your 780nm line is in fact, 775nm.


"alex" <aesbrown@xxxxxxxxxxx> wrote in message
news:1177715973.476943.81860@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
I will be using a 780 nm diode laser for absorption spectroscopy of
Iodine molecules.... My quick question is what is this equivalent to
in energy level terms measured in cm^-1? I have worked it out to be
12820 cm^-1... Is this correct?

Have any of you heard of absorption spectroscopy of iodine at 780 nm?
I can't find any when I google "spectra iodine 780 nm." The nearest I
have gotten is 760 nm. I hope a search with the more usual cm^-1
units will bare more fruit.

Thanks
ALex



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