%0 Journal Article
%A Campargue, Alain
%A Kassi, Samir
%A Yachmenev, Andrey
%A Kyuberis, Aleksandra A.
%A Küpper, Jochen
%A Yurchenko, Sergei N.
%T Observation of electric-quadrupole infrared transitions in water vapor
%J Physical review research
%V 2
%@ 2643-1564
%C College Park, MD
%I APS
%M PUBDB-2020-01627
%P 023091
%D 2020
%X Molecular absorption of infrared radiation is generally due to rovibrational electric-dipole transitions. Electric-quadrupole  transitions  may  still  occur,  but  they  are  typically  a  million  times  weaker  than  electric-dipoletransitions,  rendering  their  observation  extremely  challenging.  In  polyatomic  or  polar  diatomic  molecules,rovibrational quadrupole transitions have never been observed. Here, we report the direct detection of quadrupoletransitions  in  water  vapor.  The  detected  quadrupole  lines  have  intensity  largely  above  the  standard  dipoleintensity cutoff of spectroscopic databases and thus are important for accurate atmospheric and astronomicalremote sensing.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000602775900005
%R 10.1103/PhysRevResearch.2.023091
%U https://bib-pubdb1.desy.de/record/437589