Weak Line Water Vapor Spectrum in the 11 787–13 554 cm−1 Region

Abstract

New Fourier Transform spectra of water vapor are presented in the range 6,500 -16,400 cm¥ § ¦

Water vapour line assignments in the 9250–26000cm−1 frequency range

“…This CRDS study of water vapour and a similar one performed in the mid-infrared [45] have confirmed what was already suspected from theoretical analysis [46], as one looks deeper into the spectrum of water vapour more and more lines appear. There are a number of studies available [6,8,[17][18][19]47] which probe deeper at the lower frequency end of the spectral range considered here. With the exception of the study by Brown et al [6], these studies are most useful for characterising the position and strength of the weak lines.…”

“…The complexity of weak rotation-vibration spectrum of water at these wavelengths has encouraged the development of assignment procedures based on variational nuclear motion calculations [11,12]. These have been widely applied to the spectrum of water vapour at near-infrared and visible wavelengths [13][14][15][16][17][18][19]. The result has been a considerable advance in our understanding of the spectroscopy of water in these regions, see [20] for example.…”

Intracavity laser absorption spectroscopy of HDO between 11645 and 12330cm−1

“…As far as possible, we used the line positions accurately measured by FTS [2] to calibrate the ICLAS spectrum. Lines due to H 2 O [23,24] appearing superimposed to the HDO spectrum were also used as references in the high energy region where no HDO lines were observed by FTS [2].…”

Water line parameters for weak lines in the range 7400–9600cm−1

“…While several of these spectra have already been analysed [9][10][11], the lowest frequency spectrum, which probed the region between 6500 and 11 000 cm À1 , has been ignored until now. Fig.…”

“…Similarly the whole visible region has similarly been updated using spectra recorded by the Brussels-Rheims collaboration [3][4][5]. The near infrared region between 9500 and 11 000 cm À1 was the subject of a particularly careful study by Brown et al [6] which is also included in HITRAN-2004. There is observational evidence that further weak water lines in both the mid infrared [8] and visible [9][10][11] need to be considered before the database is complete. However, it would appear that the gap in HI-TRAN updates between 8000 and 9500 cm À1 is probably a more serious problem.…”