The microwave and submillimeterwave spectrum of 13C1-methyl formate in its ground torsional state (H13COOCH3)

Willaert, F.; Møllendal, Harald; Alekseev, E. A.; Carvajal, M.; Kleiner, Isabelle; Demaison, J.

doi:10.1016/j.molstruc.2006.02.013

Cited by 22 publications

(52 citation statements)

References 25 publications

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“…The millimeter wave measurements were performed in Lille with a source-modulated spectrometer using phase-stabilized backwardwave oscillators working in the frequency range 150-700 GHz, with transitions measured between 150-245 GHz, 320-350 GHz, 510-525 GHz, and 580-661 GHz (Willaert et al 2006). The pressure in the absorption cell was about 30 mTorr.…”

Section: Spectroscopic Detailsmentioning

confidence: 99%

“…Curl (1959) Oesterling et al (1995) provided around 900 lines of the spectrum of symmetric monodeuterated methyl formate (DCOOCH 3 ) in the ground state. In 2006 around 500 measurements for 13 C 1 methyl formate, H 13 COOCH 3 , were carried out in the 7-62 GHz, 300-322 GHz and 570-610 GHz spectral range by Willaert et al (2006). Very recently, the spectrum of H 13 COOCH 3 was also recorded between 110 and 377 GHz using the FASSST spectrometer and more than 4900 transitions belonging to v t = 0, 910 transitions belonging to v t = 1 and 231 transitions belonging to v t = 2 (Maeda et al 2008a,b) were fitted separately using the ErHam procedure in the principal axis system (Groner 1992(Groner , 1997Groner et al 1998).…”

Section: Introductionmentioning

confidence: 99%

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Rotational spectrum of¹³C₂-methyl formate (HCOO¹³CH₃) and detection of the two¹³C-methyl formate in Orion

Carvajal¹,

Margulès

Tercero

et al. 2009

A&A

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116

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Context. Laboratory measurements and analysis of the microwave and millimeter-wave spectra of potential interstellar molecules are a prerequisite for their subsequent identification by radioastronomical techniques. The spectral analysis provides spectroscopic parameters that are used in the assignment procedure of the laboratory spectra, and that also predict the frequencies of transitions not measured in the laboratory with a high degree of precision.Aims. An experimental laboratory study and its theoretical analysis is presented for 13 C 2 -methyl formate (HCOO 13 CH 3 ) allowing a search for this isotopologue in the Orion molecular cloud. The 13 C 1 -methyl formate (H 13 COOCH 3 ) molecule was also searched for in this interstellar cloud, using previously published spectroscopic data. Methods. The experimental spectra of 13 C 2 -methyl formate were recorded in the microwave and sub-mm energy ranges (4-20 GHz, 8-80 GHz, 150-700 GHz). The spectra were analyzed using the Rho-Axis Method (RAM), which takes the CH 3 internal rotation and the coupling between internal rotation and global rotation into account. Results. Twenty-seven spectroscopic constants of 13 C 2 -methyl formate have been obtained from a fit of 936 transitions of the ground torsional state with a standard (unitless) deviation of 1.08. A prediction of line positions and intensities is also produced. This prediction allowed us to identify 230 13 C 2 -methyl formate lines in the Orion interstellar molecular cloud. We refitted all previously published ground state transitions of the 13 C 1 -methyl formate molecule in order to provide a prediction of its ground state spectrum. 234 lines of 13 C 1 -methyl formate were detected in the Orion interstellar cloud using that prediction.

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Section: Spectroscopic Detailsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rotational spectrum of¹³C₂-methyl formate (HCOO¹³CH₃) and detection of the two¹³C-methyl formate in Orion

Carvajal¹,

Margulès

Tercero

et al. 2009

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116

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“…Therefore we decided to investigate all the mono-isotopic species of methyl formate in the submillimeter-wave domain a few years ago. For each of them, this permits generating a new accurate prediction and allows detecting the 13 C species (Willaert et al 2006;Carvajal et al 2007Carvajal et al , 2009Carvajal et al , 2010, DCOOCH 3 , 18 O species in Orion-KL and recently HCOOCH 2 D (Coudert et al 2013). This confirms the assumption that most of the U-lines come from known molecules.…”

Section: Introductionmentioning

confidence: 99%

THz spectroscopy and first ISM detection of excited torsional states of¹³C-methyl formate

Haykal¹,

Carvajal²,

Tercero³

et al. 2014

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Context. An astronomical survey of interstellar molecular clouds needs a previous analysis of the spectra in the microwave and sub-mm energy range of organic molecules to be able to identify them. We obtained very accurate spectroscopic constants in a comprehensive laboratory analysis of rotational spectra. These constants can be used to predict the transitions frequencies very precisely that were not measured in the laboratory. Aims. We present the experimental study and its theoretical analysis for two 13 C-methyl formate isotopologues to detect these two isotopologues for the first time in their excited torsional states, which lie at 130 cm −1 (200 K) in Orion-KL. Methods. New spectra of HCOO 13 CH 3 ( 13 C 2 ) methyl formate were recorded with the mm-and submm-wave spectrometer in Lille from 50 to 940 GHz. A global fit for v t = 0 and 1 was accomplished with the BELGI program to reproduce the experimental spectra with greater accuracy. Results. We analysed 5728 and 2881 new lines for v t = 0 and 1 for HCOO 13 CH 3 . These new lines were globally fitted with 846 previously published lines for v t = 0. In consequence, 52 parameters of the RAM Hamiltonian were accurately determined and the value of the barrier height (V 3 = 369.93168(395) cm −1 ) was improved. We report the detection of the first excited torsional states (v t = 1) in Orion-KL for the 13 C 2 and 13 C 1 methyl formate based on the present analysis and previously published data. We provide column densities, isotopic abundances, and vibrational temperatures for these species. Conclusions. Following this work, accurate prediction can be provided. This permits detecting 135 features of the first excited torsional states of 13 C-methyl formate isotopologues in Orion-KL in the 80−280 GHz frequency range, without missing lines.

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“…Since its discovery in Sgr B2 (Brown et al 1975;Churchwell et al 1975), extensive spectroscopic studies have been carried out for the main species (Bauder 1979;Demaison et al 1983;Plummer et al 1984Plummer et al , 1986Oesterling et al 1999;Karakawa et al 2001;Ogata et al 2004;Carvajal et al 2007;Maeda et al 2008b;Ilyushin et al 2009;Full Tudorie et al 2012;Kobayashi et al 2013) and for its isotopologs (Curl 1959;Oesterling et al 1995;Willaert et al 2006;Maeda et al 2008a,b;Margulès et al 2009Margulès et al , 2010Carvajal et al 2009Carvajal et al , 2010Coudert et al 2012Coudert et al , 2013Tercero et al 2012;Haykal et al 2014). This spectroscopic database for the methyl formate molecule has given rise to an increasing identification of the spectral lines in different interstellar surveys.…”

Section: Introductionmentioning

confidence: 99%

THz extended spectrum of the monodeuterated methyl formate (DCOOCH₃)

Duan

Carvajal

et al. 2015

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Context. Laboratory spectral recordings and an accurate molecular spectral analysis of any potential interstellar molecule are essential for generating a complete spectroscopic line list. This permits predicting the frequencies and intensities of any transition so that subsequently, it can be identified in the interstellar medium. Aims. Our analysis of DCOOCH 3 aims to provide a comprehensive spectral catalog that encompasses as much as possible the frequency coverage of the new-generation far-IR and submillimeter wave observation facilities. Methods. We newly measured the rotational spectrum of DCOOCH 3 in the laboratory of the Jet Propulsion Laboratory in the frequency range of 0.85 to 1.5 THz. We jointly analyzed the new data with literature data using the rho axis method, which is a tool developed for the spectral analysis of molecules with large-amplitude internal CH 3 rotors. Results. We fit 27 spectroscopic constants of DCOOCH 3 to 3763 transitions with highest values of J = 69 and K a = 36 of the ground torsional state with a standard (unitless) deviation of 0.97. With respect to previous work, this is a significantly better result that was obtained with 2060 more transitions, and we also achieved a better accuracy for the new parameter values.

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The microwave and submillimeterwave spectrum of 13C1-methyl formate in its ground torsional state (H13COOCH3)

Cited by 22 publications

References 25 publications

Rotational spectrum of¹³C₂-methyl formate (HCOO¹³CH₃) and detection of the two¹³C-methyl formate in Orion

Rotational spectrum of¹³C₂-methyl formate (HCOO¹³CH₃) and detection of the two¹³C-methyl formate in Orion

THz spectroscopy and first ISM detection of excited torsional states of¹³C-methyl formate

THz extended spectrum of the monodeuterated methyl formate (DCOOCH₃)

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The microwave and submillimeterwave spectrum of 13C1-methyl formate in its ground torsional state (H13COOCH3)

Cited by 22 publications

References 25 publications

Rotational spectrum of13C2-methyl formate (HCOO13CH3) and detection of the two13C-methyl formate in Orion

Rotational spectrum of13C2-methyl formate (HCOO13CH3) and detection of the two13C-methyl formate in Orion

THz spectroscopy and first ISM detection of excited torsional states of13C-methyl formate

THz extended spectrum of the monodeuterated methyl formate (DCOOCH3)

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Rotational spectrum of¹³C₂-methyl formate (HCOO¹³CH₃) and detection of the two¹³C-methyl formate in Orion

Rotational spectrum of¹³C₂-methyl formate (HCOO¹³CH₃) and detection of the two¹³C-methyl formate in Orion

THz spectroscopy and first ISM detection of excited torsional states of¹³C-methyl formate

THz extended spectrum of the monodeuterated methyl formate (DCOOCH₃)