Comb-assisted cavity ring down spectroscopy of 17O enriched water between 7443 and 7921 cm−1

Accurate empirical rovibrational energies and transitions of H216O

“…During this qualification, described in detail in Appendix E, (a) the energy levels are equipped with uncertainties, dependability grades, and useful connectivity parameters, (b) the transitions are rated using the grades of their upper and lower energy levels, and (c) segments are associated with statistical data concerning their wavenumber ranges and their accuracy. 45,46,62,[98][99][100][101][102] Note that a complete update of the IUPAC Part III paper 17 is in progress. 107 In Table 2 segments of experimental sources, old and new, are collected reporting highly accurate measured transitions, defined as having ESU ≤ 10 −4 cm −1 .…”

“…30 Since 2013, there have been many new studies of water spectra and, in particular, the use of optical-frequency-comb-based measurements to determine very accurate frequencies for selected transitions in the infrared, see, e.g., Refs. 5,45,46. The advent and availability of new, precise experimental techniques act as an impetus to further improve the MARVEL treatment of measured transitions allowing the determination of highly accurate empirical energy levels.…”

High accuracy line positions of the ν 1 fundamental band of 14 N 2 16 O

“…On the other hand, optical frequency combs have been seldom applied to broad line surveys to extract spectroscopic parameters of molecular absorption bands. In the near-infrared (near-IR), extended measurements have been performed only on a few bands of C 2 H 2 , NH 3 and H 2 O in a sub-Doppler regime [6][7][8][9][10] and of CO, CO 2 and H 2 O in a Doppler broadening regime [11][12][13][14][15], quite often in conjunction with optical cavities to extend the effective absorption path length (as well as to enhance the laser intensity in saturated surveys). In the mid-IR, surveys over more than 50 cm -1 have been provided for the  3 band of N 2 O [16] and of CH 4 [17,18], as well as for CO 2 near 4.3 and 2.7 m [19,20].…”

“…(36) b 0.4172550738(14) 0.172768(13) 0.1164(46) P(38)-R(18) Tachikawa et al [14] Notes The uncertainties (1) are given in parenthesis in the unit of the last quoted digit. a Root Mean Square of the (Meas.-Calc.)…”

Recent advances in collisional effects on spectra of molecular gases and their practical consequences

“…These experiments yielded line positions and intensities with relative uncertainties of 6x10 -8 and 1 %, respectively. In several other line shape experiments [7,30,53,54,[56][57][58][59], the OFC was used as an optical frequency reference for a singlefrequency probe laser or for measuring the mode spacing of an optical resonator [60]. The OFC-assisted technique yields a much more accurate and precise (< 100 kHz) frequency axis than conventional techniques using a wavelength meter (> 1 MHz precision).…”