Combined analysis of the high sensitivity Fourier transform and ICLAS-VeCSEL absorption spectra of D2O between 8800 and 9520cm−1

Abstract

The absorption spectrum of dideuterated water, D 2 O, has been recorded between 8800 and 9520 cm À1 by intracavity laser absorption spectroscopy (ICLAS) based on a vertical external cavity system emitting laser (VeCSEL) and by high sensitivity Fourier Transform spectroscopy. The combined analysis of the spectra has allowed attributing 1223 transitions to the D 2 O species. The spectrum assignment was performed on the basis of the recent results of variational calculations based on an optimized potential energy surface of D 2 O. A set of 687 energy levels was derived from transitions assigned to eight upper vibrational states, 577 of them being reported for the first time. A detailed line list has been generated. The line intensities were retrieved mainly from the FTS spectrum and the absolute integrated intensities of the 2v 1 + v 2 + v 3 and the v 2 + 3v 3 bands dominating the spectrum have been determined.

Intracavity laser absorption spectroscopy of D2O between 11400 and 11900cm−1

“…Table 2 Rovibrational term values (cm À1 ) of the (3 1 1), (1 1 3), (2 1 2) and (4 1 0 first stage of this study, as well as new data from Refs. [3,16,17] were combined and used by Shirin et al [18] for a further optimization of the D 2 O PES. A new synthetic spectrum [18], referred below as ''calculation 2'', was generated with the new D 2 O PES and again with the DMS of Ref.…”

“…1): the 3m 1 + m 2 + m 3 and the m 1 + m 2 + 3m 3 centered at 11 500.247 and 11 816.636 cm À1 , respectively, belonging to the (m 1 + m 2 / 2 + m 3 ) = 4.5 polyad which is the first pentadecad of resonating states. We have recently reported the analysis of the second decad lying in the 8800-9520 cm À1 from a combined study by FTS with a 600 m path length in Reims and by ICLAS based on vertical external cavity surface emitting lasers (VeCSEL) in Grenoble [3]. This work showed that, in this spectral range, the two experimental approaches have specific advantages but a roughly equivalent sensitivity.…”

VECSEL Semiconductor Lasers: A Path to High‐Power, Quality Beam and UV to IR Wavelength by Design

“…Rovibrational analysis has been used to assign the detected lines [247]. Some of the measured molecular species are nitrous oxide (N 2 O) [245], water (H 2 O) [148,244,[246][247][248], carbon dioxide (CO 2 ) [148,246], hydrogen sulfide (H 2 S) [249], acetylene (HCCH) [248], and carbonyl sulfide (OCS) [250], as well as a variety of isotopic variants such as D 2 O [251]. Prior to the development of semiconductor VECSELs, ICLAS relied primarily on Ti:sapphire laser in the 700-900 nm range and dye lasers in the visible range.…”

Intracavity Laser Absorption Spectroscopy of D2O between 12850 and 13380cm−1

“…Although several recent papers [1][2][3][4][5][6] have extended to higher energies the experimental investigations of the D 2 O absorption spectroscopy, the highest transitions reported so far have been observed by ICLAS around 12 800 cm À1 [3,6] (see Fig. 1).…”