New wave-number calibration tables for H_2O, CO_2, and OCS lines between 500 and 900 cm^−1

Kauppinen, J.; Jolma, K.; Horneman, V.‐M.

doi:10.1364/ao.21.003332

Cited by 80 publications

(43 citation statements)

References 13 publications

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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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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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show abstract

“…This allows us to write the eigenvalues and eigenfunctions of Eq. [15], which are characterized by v, v 2 , J , and k, as [17] where |θ αβ n are the basis set functions for the bending wavefunctions (29) and the integer n Max is the n-value at which the expansion is truncated. The bending wavefunction given in Eqs.…”

Section: Diagonal Contributionsmentioning

confidence: 99%

“…The bending wavefunction given in Eqs. [17] will be used to calculate matrix elements of nondiagonal contributions arising from the zeroth-order Hamiltonian. In the next section, matrix elements arising from these contributions are evaluated.…”

Section: Diagonal Contributionsmentioning

confidence: 99%

High-Lying Rotational Levels of Water: An Analysis of the Energy Levels of the Five First Vibrational States

Lanquetin¹,

Coudert

Camy‐Peyret

2001

Journal of Molecular Spectroscopy

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“…Positions of absorption maxima were interpolated to 4 digits after the decimal point and carefully calibrated with H 20 and C 0 2 lines (Vacuum inter ferometer) [19], while N 20 lines [20. 21] were used for the calibration of the purged 7199 instrument.…”

Section: Methodsmentioning

confidence: 99%

The Fourier Transform IR Spectra of CIF and BrF

Bürger

Jacob

Fähnle

1986

Zeitschrift Für Naturforschung A

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New wave-number calibration tables for H_2O, CO_2, and OCS lines between 500 and 900 cm^−1

Cited by 80 publications

References 13 publications

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

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

High-Lying Rotational Levels of Water: An Analysis of the Energy Levels of the Five First Vibrational States

The Fourier Transform IR Spectra of CIF and BrF

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