Close

Search

Search Menu
Photonics Media Photonics Buyers' Guide Photonics EDU Photonics Spectra BioPhotonics EuroPhotonics Industrial Photonics Photonics Showcase Photonics ProdSpec Photonics Handbook
More News
SPECIAL ANNOUNCEMENT
2016 Photonics Buyers' Guide Clearance! – Use Coupon Code FC16 to save 60%!
share
Email Facebook Twitter Google+ LinkedIn Comments

Researchers Measure Vibrationally Excited Water

Photonics Spectra
Sep 2002
At a minimum, predicting the absorption spectrum for water vapor requires a set of line positions and intensities and a shape function. Line intensities can be determined from a dipole moment surface, but a team of researchers from École Polytechnique Fédérale de Lausanne in Switzerland, University of Rochester in New York and University College London suggests in the Aug. 9 issue of Science that the best available surfaces are not accurate in the optical spectrum.

The researchers based their observations on a series of dipole moment measurements of water that had been highly excited vibrationally. They did not measure line intensities but relied on a sequence of three pulses approximately 10 ns in width from Nd:YAG lasers to measure Stark splittings in very weak overtone transitions.

The researchers found that these experimental dipole moments differed by as much as 9.2 percent from current predictions from the best dipole moment surfaces.


Comments
Terms & Conditions Privacy Policy About Us Contact Us
back to top

Facebook Twitter Instagram LinkedIn YouTube RSS
©2016 Photonics Media
x Subscribe to Photonics Spectra magazine - FREE!