Weak water absorption lines around 1.455 and 1.66 μm by CW-CRDS

Abstract The absorption spectra of water vapor near 1.455 and 1.66 μm have been recorded with a typical absorption sensitivity of 5 × 10 −10  cm −1 by using CW-cavity ring down spectroscopy. A series of 18 distributed feed-back (DFB) lasers was used as sources and allowed for the coverage of the 5911.0–5922.5, 5926–5941.8, 5957.0–6121.6, and 6745–7015.6 cm −1 spectral regions. These regions extend to lower and higher energies our previous study of the water spectrum in the important 1.5 μm transparency window [P. Macko, D. Romanini, S.N. Mikhailenko, O.V. Naumenko, S. Kassi, A. Jenouvrier, Vl.G. Tyuterev, J. Mol. Spectrosc. 227 (2004) 90–108]. The line parameters were determined with the help of an interactive least squares multi-lines fitting program which uses a Voigt function as line profile. More than 1900 water lines with intensities ranging between 10 −28 and 5 × 10 −24  cm/molecule at 296 K were measured, about 690 of them being reported for the first time. The rovibrational assignment was performed on the basis of previously determined energy levels and of the results of the variational global calculations [H. Partridge, D.W. Schwenke, J. Chem. Phys. 106 (1997) 4618–4639]. The assignment results were validated by using the Ritz combination principle together with previously reported water transitions. Several new energy levels were determined for the H 2 16 O, H 2 17 O, and HD 16 O isotopologues. The retrieved line lists of the H 2 16 O, H 2 17 O, H 2 18 O, and HD 16 O isotopologues are compared with the available calculated and experimental (FTS) databases for water.

[1]  Daniele Romanini,et al.  High sensitivity cw-cavity ringdown and Fourier transform absorption spectroscopies of 13CO2 , 2004 .

[2]  J. Flaud,et al.  Spectrum of H218O and H217O in the 6974 to 7387 cm−1 region , 1977 .

[3]  S. Mikhailenko,et al.  High sensitivity CW-cavity ring down spectroscopy of water in the region of the 1.5 μm atmospheric window , 2004 .

[4]  Harry Partridge,et al.  The determination of an accurate isotope dependent potential energy surface for water from extensive ab initio calculations and experimental data , 1997 .

[5]  S. Tashkun,et al.  CDSD-1000, the high-temperature carbon dioxide spectroscopic databank , 2003 .

[6]  Daniele Romanini,et al.  High-sensitivity CW-cavity ringdown spectroscopy of 12CO2 near 1.5 μm , 2005 .

[7]  V. I. Starikov,et al.  Water Spectra in the Region 4200-6250 cm −1 , Extended Analysis of ν1 + ν2, ν2 + ν3, and 3ν2 Bands and Confirmation of Highly Excited States from Flame Spectra and from Atmospheric Long-Path Observations , 2002 .

[8]  B. Bussery-Honvault,et al.  Very high sensitivity CW-cavity ring down spectroscopy: Application to the a1Δg(0)–X3Σg-(1) O2 band near 1.58 μm , 2005 .

[9]  Ann Carine Vandaele,et al.  Fourier transform measurements of water vapor line parameters in the 4200–6600 cm−1 region , 2007 .

[10]  S. Tashkun,et al.  CW-cavity ringdown spectroscopy of carbon dioxide isotopologues near 1.5 μm , 2006 .

[11]  A. Barbe,et al.  Fourier transform and high sensitivity cw-cavity ringdown absorption spectroscopies of ozone in the 6030–6130 cm−1 region. First observation and analysis of the 3ν1+3ν3 and 2ν2+5ν3 bands , 2006 .

[12]  S. Mikhailenko,et al.  (0 0 0) and (0 1 0) States of H 2 18 O: analysis of rotational transitions in hot emission spectrum in the 400-850 cm -1 region , 2003 .

[13]  Toth.  Line Positions and Strengths of HDO between 6000 and 7700 cm-1 , 1997, Journal of molecular spectroscopy.

[14]  J. Flaud,et al.  Line intensities in the ν1 + 2ν2, 2ν2 + ν3, 2ν1, ν1 + ν3, 2ν3, and ν1 + ν2 + ν3 − ν2 bands of H216O, between 6300 and 7900 cm−1 , 1986 .

[15]  Robert A. Toth,et al.  Measurements of positions, strengths and self-broadened widths of H2O from 2900 to 8000 cm−1: line strength analysis of the 2nd triad bands , 2005 .

[16]  Le Wang,et al.  High-resolution Fourier-transform spectroscopy of 18O-enriched water molecule in the 1080–7800 cm−1 region , 2006 .

[17]  Daniele Romanini,et al.  Two schemes for trace detection using cavity ringdown spectroscopy , 2004 .

[18]  Gang Li,et al.  The HITRAN 2008 molecular spectroscopic database , 2005 .

[19]  J. Flaud,et al.  Line positions and intensities for the ?1 + ?2 and ?2 + ?3 bands of H218O , 1978 .

[20]  R A Toth,et al.  Transition frequencies and strengths of H217O and H218O: 6600 to 7640 cm(-1). , 1994, Applied optics.

[21]  J. Flaud,et al.  The first hexad {(040), (120), (021), (200), (101), (002)} of H218O: experimental energy levels and line intensities , 1986 .

[22]  J. Flaud,et al.  Vibration-rotation intensities for the 3ν2, ν1 + ν2, and ν2 + ν3 bands of H216O , 1977 .

[23]  Herbert Over,et al.  Rotational levels of the (0 0 0) and (0 1 0) states of D216O from hot emission spectra in the 320–860 cm−1 region , 2004 .

[24]  J. Flaud,et al.  H218O: The (030), (110), and (011) interacting states. Line positions and intensities for the 3ν2, ν1 + ν2, and ν2 + ν3 bands , 1985 .

[25]  S. Mikhailenko,et al.  Analysis of the first triad of interacting states (020), (100), and (001) of D216O from hot emission spectra , 2005 .

[26]  R A Toth,et al.  Extensive measurements of H216O line frequencies and strengths: 5750 to 7965 cm(-1). , 1994, Applied optics.

[27]  C. Camy‐Peyret,et al.  The 4ν2 band of H216O , 1980 .

[28]  Harry Partridge,et al.  Convergence testing of the analytic representation of an ab initio dipole moment function for water: Improved fitting yields improved intensities , 2000 .