Modeling Titan's Thermal Infrared Spectrum for High-Resolution Space Observations

Coustenis, A.; Encrenaz, Th.; Bézard, Bruno; Bjoraker, G. L.; Graner, G.; Dang-Nhu, M.; Arie, E.

doi:10.1006/icar.1993.1047

Cited by 76 publications

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“…Furthermore, acetylene concentration in human breath has been identified as a biomarker for smoking [5]. Acetylene has been found as a trace constituent of the Titan atmosphere and in outer planetary atmospheres of Jupiter and Saturn [6,7]. Accurate measurements of important spectroscopic parameters such as linestrengths, collisional broadening coefficients and their temperature dependencies are crucial for precise measurements of acetylene concentration in a variety of environments.…”

Section: Introductionmentioning

confidence: 99%

Measurements of linestrengths, N2-, Ar-, He- and self-broadening coefficients of acetylene in the ν4+ν5 combination band using a cw quantum cascade laser

Sajid

Es-sebbar

Farooq

2014

Journal of Quantitative Spectroscopy and Radiative Transfer

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Measurements of linestrengths, N2-, Ar-, He-and selfbroadening coefficients of acetylene in the 4+5 combination band using a cw quantum cascade laser KAUST Repository AbstractLinestrengths, N 2 -, Ar-, He-and self-broadening coefficients of acetylene have been measured at 296 K in the P branch of the ν 4 +ν 5 combination band for 25 rotational transitions. The effect of gas temperature is studied over 296 -683 K for five transitions to allow the determination of the temperature dependent exponent n for N 2 -and Ar-broadening coefficients. These measurements were performed using a continuous-wave quantum cascade laser (cw-QCL) operating over 1253 -1310 cm -1 . Spectroscopic parameters were obtained by fitting absorption spectra using Voigt, Galatry and Rautian profiles. Linestrength and broadening results are compared with previous studies available in literature for the ν 4 +ν 5 combination band and other vibrational bands of acetylene.

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Section: Introductionmentioning

confidence: 99%

Measurements of linestrengths, N2-, Ar-, He- and self-broadening coefficients of acetylene in the ν4+ν5 combination band using a cw quantum cascade laser

Sajid

Es-sebbar

Farooq

2014

Journal of Quantitative Spectroscopy and Radiative Transfer

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“…Allene has been the object of much investigation for its relevance to astrochemistry [1][2][3] and to studies of photodissociation dynamics. [4][5][6][7][8][9] Allene is also the smallest member of the cumulene family and one of the simplest representatives of the D 2d ͑M͒ molecular symmetry group.…”

Section: Introductionmentioning

confidence: 99%

Rotationally resolved photoelectron spectroscopic study of the Jahn–Teller effect in allene

Schulenburg

Merkt

2009

The Journal of Chemical Physics

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The pulsed-field-ionization zero-kinetic-energy photoelectron spectra of allene (C3H4) and perdeuterated allene have been recorded from the first adiabatic ionization energy up to 2200 cm−1 of internal energy in the cations at a resolution sufficient to observe the full rotational structure. The intensity distributions in the spectra are dominated by vibrational progressions in the torsional mode, which were analyzed in the realm of a two-dimensional model of the E⊗(b1⊕b2) Jahn–Teller effect in the allene cation [C. Woywod and W. Domcke, Chem. Phys. 162, 349 (1992)]. Whereas the rotational structure of the transitions to the lowest torsional levels (00 and 41) are regular and can be qualitatively analyzed in terms of a simple orbital ionization model, the rotational structure of the spectra of the 42 and 43 levels are strongly perturbed. The photoelectron spectrum of C3H4 also reveals several weak vibrational bands in the immediate vicinity of these levels that are indicative of (ro)vibronic perturbations. A slight broadening of the transitions to the 41 levels compared to that of the vibronic ground state and the increase of the number of sharp features in the rotational structure of the spectrum of the 42 level point at the importance of large-amplitude motions not considered in previous treatments of the Jahn–Teller effect in the allene cation.

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“…Although allene was not observed by the infrared interferometer and spectrometer (IRIS) on board the Voyager spacecraft, an upper mole-fraction limit of 5 ϫ 10 Ϫ9 was implied from a fit of the spectroscopic data (3,4). Allene was not detected by the short/long wavelength grating spectrometer on the Infrared Space Observatory (ISO) either and the upper limit is yet to be derived.…”

Section: Introductionmentioning

confidence: 99%

“…Allene was not detected by the short/long wavelength grating spectrometer on the Infrared Space Observatory (ISO) either and the upper limit is yet to be derived. However, the composite infrared spectrometer (CIRS) abroad the Cassini mission that is currently on its way to Titan will be capable of detecting allene at much lower abundances owing to CIRS's much higher sensitivity (4). Candidate spectral regions for the observation of allene include the isolated weak 353 cm Ϫ1 11 band and the strong 10 band near 841 cm Ϫ1 (4).…”

Section: Introductionmentioning

confidence: 99%

FTIR Measurements of N2-Induced Pressure Broadening of Allene (C3H4) in the ν10 Band

Wang

Sirota

Reuter

1999

Journal of Molecular Spectroscopy

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Modeling Titan's Thermal Infrared Spectrum for High-Resolution Space Observations

Cited by 76 publications

References 0 publications

Measurements of linestrengths, N2-, Ar-, He- and self-broadening coefficients of acetylene in the ν4+ν5 combination band using a cw quantum cascade laser

Measurements of linestrengths, N2-, Ar-, He- and self-broadening coefficients of acetylene in the ν4+ν5 combination band using a cw quantum cascade laser

Rotationally resolved photoelectron spectroscopic study of the Jahn–Teller effect in allene

FTIR Measurements of N2-Induced Pressure Broadening of Allene (C3H4) in the ν10 Band

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