Wednesday, June 12, 2013

Take Five

For true joy, get them to play together (start the top one first:)


Scatter said...

Something like this?

Hank Roberts said...

Richard J. Saykally, Department of Chemistry, University of California, Berkeley, CA 94720, USA
Published February 25, 2013 | Physics 6, 22 (2013) | DOI: 10.1103/Physics.6.22

Water dimers have been detected in room-temperature water vapor, a key step toward understanding their effect on solar absorption and chemistry in the atmosphere.
Water Dimer Rotationally Resolved Millimeter-Wave Spectrum Observation at Room Temperature

M. Yu. Tretyakov, E. A. Serov, M. A. Koshelev, V. V. Parshin, and A. F. Krupnov
Phys. Rev. Lett. 110, 093001 (2013)
Published February 25, 2013 | PDF (free)
High-resolution spectroscopy is allowing scientists to detect the presence of water dimers—the simplest cluster of water molecules (inset)—in a sample of water vapor. The pink line is the measured spectrum and the white line is the calculated dimer spectrum. (The monomer contribution—indicated by the yellow trace—has been subtracted.) The vertical bars show the positions of the dimer rotational lines. The spectrum was measured in water vapor in equilibrium at 23 °C and 0.022 atm.

Water is the third most abundant molecule in the atmosphere and the principal absorber of both incoming sunlight and reradiated blackbody radiation. Yet models of atmospheric absorption that only take into account the water molecule’s well-known rotational and vibration-rotational transitions don’t match up with measurements of the atmosphere’s absorption spectrum [1]....


Anonymous said...


Thanks for the last link about water dimer in gas phase. Eli and I would both get a lot out of this paper, it is a really quite amazing spectroscopic achievement. As far as climate deniers using this, I think it is much too obscure, and a pretender can get exposed pretty quick.

Rib Smokin' Bunny