Monthly Archives: March 2018

Sulfur hydrogen bonds

Hydrogen bonds (HBs) involving sulfur are considered much weaker than those of more electronegative atoms. We recently published a comparison between the HBs in the furfuryl mercaptan – water dimer and compared the HBs with those in furfuryl alcohol. The investigation was published in Chemistry – A European Journal. and highlighted in the Journal cover.

The cover below shows a 3D map of electronegativity along the periodic table and the observed dimers.

 


Cosmic dawn

Category : Cosmology , General News

A VHF absorption signal at 78 MHz in the sky-averaged spectrum has been interpreted as a result of the formation of the first stars, a process that illuminated the universe with UV radiation and is called the cosmic dawn, as reported in a comment and article in Nature. The UV radiation would modify the excitation state of the 1420.4  MHz hydrogen spin atomic transition and would indicate the universe temperature. The linewidth suggest that the first stars appear 180 Myears after the Big Bang, while the flatten line profile has been connected speculatively with the interaction between normal matter and dark matter, which, if confirmed, would be truly remarkable.