Absorption spectrum of water vapor between 4.5 and 13 microns

Abstract

The absorption spectrum of water va l~o r has bee nrneas~ll'e d from ' 1.5 to l~ micro ns w! th a 3,600 lin~ per inch replica echelette grating a s t he disperSin g. ele me nt. Varr ous absorblOg path lengtns and concentrations of water vapor at atmosphe rIC press ure were used up to 8 me ters of steam near noD C. Almost all of the previous ly un reported lines that have been found are also present in the solar spectrum . ~ .ro tationa l ana l.ys is shows that JTlO~t. of the lines can bo assigne d eit her to rotatIOnal t ranSitIO ns or to rotation-vibratIO n tranSItIOn s of t he " 2 fundam enta l of the water-vapor mol ec ule . In addition, a few lines have a lso bee n a ss igned to the t ransitions (2"2-"2) , ("1-"2), a nd . ("3-"2)'

The ro-vibrational Raman spectrum of water vapour υ2 and 2υ2

“…For the vibrational ground state and the excited levels ~'1, 2v2 and vz, energies and wave functions were kindly provided by Ftaud and Camy-Peyret from their recent work [2]. For v2, literature values for the energies of the ro-vibrational levels [12] were fitted using a Watson hamiltonian including sextic centrifugal distortion constants; the resulting wave functions were used in the intensity calculations. The higher accuracy measurements of v 2 transition frequencies determined recently [13,14] were not used since the author became aware of them after completion of the calculations described here ; if they were used, it is expected that the variation in the calculated spectrum would be small compared to the noise in our experimental results.…”

Water Cluster Growth in Hydrophobic Solid Nanospaces

“…For instance, water molecules in nanopores cannot form large clusters that are larger than the nanopore width due to the size restriction, while in the bulk vapor clusters are not formed as evidenced by IR spectroscopy. [13,14] Instead they associate to form larger clusters on condensation. Thus, the properties and structures of water in hydrophobic nanopores have been actively studied.…”

Propagation of Visible and Infrared Waves in the Atmosphere (Rasprostranenie Vidimykh i Infrakrasnykh Voln v Atmosfere)

“…Benedict, Claassen and Shaw [166] found under laboratory conditions the intensities of several rotation lines and lines from the vibration-rotation v2 band at a relatively high temperature and H 2 0 concentration.…”

“…The water vapor spectrum in the regions 4.5 -5.7 and 6.6 -13 p have been studied in detail by Benedict, Claassen and Shaw [166].…”

“…The absorption functions for the 2.5 cm-1 intervals were calculated using the resuilts of article [166].…”