High-resolution rotational absorption spectra of H_2^16O, HD^16O, and D_2^16O between 110 and 500 cm^−1

Paso, R.; Horneman, V.‐M.

doi:10.1364/josab.12.001813

Cited by 51 publications

(50 citation statements)

References 15 publications

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“…D 2 0 absorption data are rare due to the difficulty in establishing experimental conditions for measuring pure D20 vapor, since it is hardly possible to remove H20 molecules completely from the sample volume and maintain pure D20 vapor in the cell [29], [30] .…”

Section: Heavy Water Vapor (D 2 0)mentioning

confidence: 99%

High-Resolution Terahertz Spectrometer

Klatt

Gebs

Schäfer

et al. 2011

IEEE J. Select. Topics Quantum Electron.

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Abstract-Terahertz time-domain spectroscopy (THz-TDS) based on high-speed asynchronous optical sampling (ASOPS) with two offset-locked GHz femtosecond lasers requires no mechanical time-delay scanner. Consequently, measurements with 1-GHz frequency resolution are performed at intrinsically high scan rates in the muItikilohertz range. This is at least one order, in most cases several orders of magnitude faster than conventional approaches employing mechanical time-delay scanners. We report a system offering a unique combination of high-frequency resolution (1 GHz) and high scan rate (2 kHz) with a spectral coverage of more than 6 THz. Its capabilities for high-precision spectroscopy are demonstrated by measuring the absorption spectrum of a mixture of H 2 0, D 2 0, and hydrogen deuterium oxide (HDO) vapor. H20 and HDO vapor absorption spectra are accurately tabulated in databases. However, D 2 0 absorption data are rare, because of residual H 2 0 and HDO often present when measuring pure D2 O. Here, we present a high-resolution absorption spectrum of D 2 0 vapor numerically extracted from the absorption spectrum of the three-component mixture. In addition, we show that the high spectral resolution of the ASOPS THz-TDS system provides benefit~ in the analysis of frequency-selective surface sensors, which are promising candidates for biosensing applications in the THz regime.

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Section: Heavy Water Vapor (D 2 0)mentioning

confidence: 99%

High-Resolution Terahertz Spectrometer

Klatt

Gebs

Schäfer

et al. 2011

IEEE J. Select. Topics Quantum Electron.

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“…The measurements were carried out at room temperature with a pressure of 1 Torr; 12 h of acquisition time was necessary to reach an acceptable signal-to-noise ratio. The spectrum was calibrated with 89 H 2 O lines, [18][19][20] which cover the 180-640 cm −1 region and have experimental accuracies ranging from 0.0001 to 0.0002 cm −1 . The experimental uncertainty of ammonia line positions was estimated to be 0.0003 cm −1 .…”

Section: Far-ir Fourier Transform Absorption Measurements At Synchmentioning

confidence: 99%

Submillimeter-wave and far-infrared spectroscopy of high-J transitions of the ground and ν2=1 states of ammonia

Pearson

Drouin

et al. 2010

The Journal of Chemical Physics

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Complete and reliable knowledge of the ammonia spectrum is needed to enable the analysis and interpretation of astrophysical and planetary observations. Ammonia has been observed in the interstellar medium up to J=18 and more highly excited transitions are expected to appear in hot exoplanets and brown dwarfs. As a result, there is considerable interest in observing and assigning the high J (rovibrational) spectrum. In this work, numerous spectroscopic techniques were employed to study its high J transitions in the ground and ν2=1 states. Measurements were carried out using a frequency multiplied submillimeter spectrometer at Jet Propulsion Laboratory (JPL), a tunable far-infrared spectrometer at University of Toyama, and a high-resolution Bruker IFS 125 Fourier transform spectrometer (FTS) at Synchrotron SOLEIL. Highly excited ammonia was created with a radiofrequency discharge and a dc discharge, which allowed assignments of transitions with J up to 35. One hundred and seventy seven ground state and ν2=1 inversion transitions were observed with microwave accuracy in the 0.3–4.7 THz region. Of these, 125 were observed for the first time, including 26 ΔK=3 transitions. Over 2000 far-infrared transitions were assigned to the ground state and ν2=1 inversion bands as well as the ν2 fundamental band. Of these, 1912 were assigned using the FTS data for the first time, including 222 ΔK=3 transitions. The accuracy of these measurements has been estimated to be 0.0003–0.0006 cm−1. A reduced root mean square error of 0.9 was obtained for a global fit of the ground and ν2=1 states, which includes the lines assigned in this work and all previously available microwave, terahertz, far-infrared, and mid-infrared data. The new measurements and predictions reported here will support the analyses of astronomical observations by high-resolution spectroscopy telescopes such as Herschel, SOFIA, and ALMA. The comprehensive experimental rovibrational energy levels reported here will permit further refinement of the potential energy surface to improve ammonia ab initio calculations and facilitate assignment of new high-resolution spectra of hot ammonia.

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“…The lines in Fig. 2 We picked up the candidate lines of our measurement from the frequency tables obtained by FT spectrometers previously [14,15]. Frequency of about 150 rotational lines of D 2 O were determined.…”

Section: Resultsmentioning

confidence: 99%

“…He also reported the measurements of other isotopic species of water molecule and gave the sets of molecular parameters for each species. The table was extended to 420 cm −1 by Paso and Horneman in 1995 [15]. The spectral resolution of the FT spectrometer is typically about 0.0025 cm −1 .…”

Section: Introductionmentioning

confidence: 99%

Frequency measurement of pure rotational transitions of D₂O using tunable terahertz spectrometer

Matsushima

Kobayashi

Moriwaki

2009

J. Phys.: Conf. Ser.

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High-resolution rotational absorption spectra of H_2^16O, HD^16O, and D_2^16O between 110 and 500 cm^−1

Cited by 51 publications

References 15 publications

High-Resolution Terahertz Spectrometer

High-Resolution Terahertz Spectrometer

Submillimeter-wave and far-infrared spectroscopy of high-J transitions of the ground and ν2=1 states of ammonia

Frequency measurement of pure rotational transitions of D₂O using tunable terahertz spectrometer

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High-resolution rotational absorption spectra of H_2^16O, HD^16O, and D_2^16O between 110 and 500 cm^−1

Cited by 51 publications

References 15 publications

High-Resolution Terahertz Spectrometer

High-Resolution Terahertz Spectrometer

Submillimeter-wave and far-infrared spectroscopy of high-J transitions of the ground and ν2=1 states of ammonia

Frequency measurement of pure rotational transitions of D2O using tunable terahertz spectrometer

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Frequency measurement of pure rotational transitions of D₂O using tunable terahertz spectrometer