FT-FIR-spectrum and the ground state constants of D213CO

Lohilahti, Jarmo; Mattila, Herkko; Horneman, V.‐M.; Pawłowski, Filip

doi:10.1016/j.jms.2005.09.015

Cited by 13 publications

(2 citation statements)

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“…The analyses took into account earlier data for five of these six isotopologues (no earlier data for HDC 18 O) from Dangoisse et al (1978) as well as extensive data for HDCO and D 2 CO from Bocquet et al (1999). Far-infrared data of D 2 CO (Lohilahti & Horneman 2004) and D 13 2 CO (Lohilahti et al 2005) were also employed for the CDMS entries.…”

Section: Laboratory Spectroscopy Datamentioning

confidence: 99%

The ALMA-PILS Survey: Formaldehyde deuteration in warm gas on small scales toward IRAS 16293–2422 B

Persson

Jørgensen

Müller

et al. 2018

A&A

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Context. The enhanced degrees of deuterium fractionation observed in envelopes around protostars demonstrate the importance of chemistry at low temperatures, relevant in pre-and protostellar cores. Formaldehyde is an important species in the formation of methanol and more complex molecules. Aims. Here, we present the first study of formaldehyde deuteration on small scales around the prototypical low-mass protostar IRAS 16293−2422 using high spatial and spectral resolution Atacama Large Millimeter/submillimeter Array (ALMA) observations. We determine the excitation temperature, abundances and fractionation level of several formaldehyde isotopologues, including its deuterated forms. Methods. Excitation temperature and column densities of formaldehyde in the gas close to one of the components of the binary are constrained through modeling of optically thin lines assuming local thermodynamical equilibrium. The abundance ratios are compared to results from previous single dish observations, astrochemical models and local ISM values. Results. Numerous isotopologues of formaldehyde are detected, among them H 2 C 17 O, and D 13 2 CO for the first time in the ISM. The large range of upper energy levels covered by the HDCO lines help constrain the excitation temperature to 106±13 K. Using the derived column densities, formaldehyde shows a deuterium fractionation of HDCO/H 2 CO=6.5±1%, D 2 CO/HDCO=12.8 +3.3 −4.1 %, and D 2 CO/H 2 CO=0.6(4)±0.1%. The isotopic ratios derived are 16 O/ 18 O=805 +43 −79 , 18 O/ 17 O=3.2 +0.2 −0.3 and 12 C/ 13 C=56 +8 −11. Conclusions. The HDCO/H 2 CO ratio is lower than found in previous studies, highlighting the uncertainties involved in interpreting single dish observations of the inner warm regions. The D 2 CO/HDCO ratio is only slightly larger than the HDCO/H 2 CO ratio. This is consistent with formaldehyde forming in the ice as soon as CO has frozen onto the grains, with most of the deuteration happening towards the end of the prestellar core phase. A comparison with available time-dependent chemical models indicates that the source is in the early Class 0 stage.

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Section: Laboratory Spectroscopy Datamentioning

confidence: 99%

The ALMA-PILS Survey: Formaldehyde deuteration in warm gas on small scales toward IRAS 16293–2422 B

Persson

Jørgensen

Müller

et al. 2018

A&A

View full text Add to dashboard Cite

show abstract

“…Excited vibrational states of H 2 CO were also investigated up to terahertz frequencies [32]. The spectroscopic parameters were improved by ground state combination differences (GSCDs) for H 2 CO [33] and by far-infrared spectra for D 2 CO [34] and D 13 2 CO [35]. In addition, the rotational spectra of formaldehyde in the ground and excited vibrational states were used to characterize a spectrometer system based on difference frequency generation [36].…”

Section: Introductionmentioning

confidence: 99%

Submillimeter spectroscopy of H$_2$C$^{17}$O and a revisit of the rotational spectra of H$_2$C$^{18}$O and H$_2$C$^{16}$O

Müller,

Lewen

2016

Preprint

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The rotational spectrum of the formaldehyde isotopologue H 2 C 17 O was investigated between 0.56 and 1.50 THz using a sample of natural isotopic composition. In addition, transition frequencies were determined for H 2 C 18 O and H 2 C 16 O between 1.37 and 1.50 THz. The data were combined with critically evaluated literature data to derive improved sets of spectroscopic parameters which include 17 O or H nuclear hyperfine structure parameters.

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70 CH2O Formaldehyde

Vogt

2010

Asymmetric Top Molecules. Part 1

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FT-FIR-spectrum and the ground state constants of D213CO

Cited by 13 publications

References 44 publications

The ALMA-PILS Survey: Formaldehyde deuteration in warm gas on small scales toward IRAS 16293–2422 B

The ALMA-PILS Survey: Formaldehyde deuteration in warm gas on small scales toward IRAS 16293–2422 B

Submillimeter spectroscopy of H$_2$C$^{17}$O and a revisit of the rotational spectra of H$_2$C$^{18}$O and H$_2$C$^{16}$O

70 CH2O Formaldehyde

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