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

ICLAS of HDO between 13,020 and 14,115cm−1

“…Note that the same ICLAS:Ti-Sa set up was recently used to investigate the H 2 16 O [10] and D 2 O [11,12] spectra in the same region. The obtained line lists will be used in the assignment process to discriminate the D 2 O and H 2 16 O transitions superimposed with the HDO lines.…”

D216O: ICLAS between 13 600 and 14 020 cm−1 and normal mode labeling of the vibrational states

“…Except for the stronger lines, the Lorentzian component was found unnecessary and a purely Gaussian profile (accounting for both the Doppler broadening and the spectrograph apparatus function) was used. As in our previous papers [1][2][3], we found more convenient and probably more accurate to obtain absolute intensity values by normalizing the relative intensity values retrieved from each elementary spectrum to the intensity values calculated in Ref. [4].…”

“…The spectra were obtained with the ICLAS spectrometer based on a Ti:Sapphire laser described in our previous papers [3,5,6]. The generation time was fixed to 190 ls corresponding to an equivalent absorption path length of 24 km.…”

“…This paper continues our series of studies of the D 2 16 O absorption spectrum by high sensitivity spectroscopy above 11 000 cm À1 [1][2][3]. We used the Intracavity Laser Absorption (ICLAS) technique to detect very weak absorption transitions of dideuterated water between 13 600 and 14 020 cm À1 .…”

“…A few of the conflicting labels concern states which have a clearly dominant normal mode character in our calculations. For example, we label as (5 0 0) (maximal fraction of 66%) the vibrational state at 12 988.432 cm À1 [3], while this state is labeled as (3 0 2) in [4]. In the region under study, we preferred the vibrational label (3 1 2) (58% contribution) …”