Frank Lewen
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View article: Investigation of the rotational spectrum of CH<sub>3</sub> <sup>17</sup>OH and its tentative detection toward Sagittarius B2(N)
Investigation of the rotational spectrum of CH<sub>3</sub> <sup>17</sup>OH and its tentative detection toward Sagittarius B2(N) Open
Context. Methanol is an abundant and widespread molecule in the interstellar medium. The column density of its 18 O isotopolog, CH 3 18 OH, is in some star-forming regions so high that the search for CH 3 17 OH is promising. But only very …
View article: Rotational spectroscopy of CH<sub>3</sub>OD with a reanalysis of CH<sub>3</sub>OD toward IRAS 16293–2422
Rotational spectroscopy of CH<sub>3</sub>OD with a reanalysis of CH<sub>3</sub>OD toward IRAS 16293–2422 Open
We have started a measurement campaign of numerous methanol isotopologs in low-lying torsional states in order to provide extensive line lists for radio astronomical observations from an adequate spectroscopic model and to investigate how …
View article: Millimetre and submillimetre spectroscopy of isobutene and its detection in the molecular cloud G+0.693
Millimetre and submillimetre spectroscopy of isobutene and its detection in the molecular cloud G+0.693 Open
Context. Isobutene ((CH 3 ) 2 C=CH 2 ) is one of the four isomers of butene (C 4 H 8 ). Given the detection of propene (CH 3 CH=CH 2 ) toward TMC-1, and also in the warmer environment of the solar-type protostellar system IRAS 16293–2422, …
View article: Millimetre and submillimetre spectroscopy of isobutene and its detection in the molecular cloud G+0.693
Millimetre and submillimetre spectroscopy of isobutene and its detection in the molecular cloud G+0.693 Open
Isobutene ((CH$_3$)$_2$C=CH$_2$) is one of the four isomers of butene (C$_4$H$_8$). Given the detection of propene (CH$_3$CH=CH$_2$) toward TMC-1, and also in the warmer environment of the solar-type protostellar system IRAS 16293$-$2422, …
View article: Rotational spectroscopy of the thioformaldehyde isotopologues H <sub>2</sub> CS and H <sub>2</sub> C <sup>34</sup> S in four interacting excited vibrational states and an account on the rotational spectrum of thioketene, H <sub>2</sub> CCS
Rotational spectroscopy of the thioformaldehyde isotopologues H <sub>2</sub> CS and H <sub>2</sub> C <sup>34</sup> S in four interacting excited vibrational states and an account on the rotational spectrum of thioketene, H <sub>2</sub> CCS Open
An investigation of the rotational spectrum of the interstellar molecule\nthioformaldehyde between 110 and 377 GHz through a pyrolysis reaction revealed\na multitude of absorption lines assignable to H$_2$CS and H$_2$C$^{34}$S in\ntheir lo…
View article: Investigation of the rotational spectrum of CD$_3$OD and an astronomical search toward IRAS 16293$-$2422
Investigation of the rotational spectrum of CD$_3$OD and an astronomical search toward IRAS 16293$-$2422 Open
Solar-type prestellar cores and protostars display large amounts of deuterated organic molecules. Recent findings on CHD$_2$OH and CD$_3$OH toward IRAS 16293-2422 suggest that even fully deuterated methanol, CD$_3$OD, may be detectable as …
View article: Investigation of the rotational spectrum of CD<sub>3</sub>OD and an astronomical search toward IRAS 16293-2422
Investigation of the rotational spectrum of CD<sub>3</sub>OD and an astronomical search toward IRAS 16293-2422 Open
Solar-type prestellar cores and protostars frequently display large amounts of deuterated organic molecules and, in particular, high relative abundances of doubly and triply deuterated isotopologs. Recent findings on CHD 2 OH and CD 3 OH t…
View article: Rotation-tunnelling spectrum and astrochemical modelling of dimethylamine, CH3NHCH3, and searches for it in space
Rotation-tunnelling spectrum and astrochemical modelling of dimethylamine, CH3NHCH3, and searches for it in space Open
Methylamine has been the only simple alkylamine detected in the interstellar medium for a long time. With the recent secure and tentative detections of vinylamine and ethylamine, respectively, dimethylamine has become a promising target fo…
View article: Rotation-tunneling spectrum and astrochemical modeling of dimethylamine, CH$_3$NHCH$_3$, and searches for it in space
Rotation-tunneling spectrum and astrochemical modeling of dimethylamine, CH$_3$NHCH$_3$, and searches for it in space Open
Methylamine has been the only simple alkylamine detected in the interstellar medium for a long time. With the recent secure and tentative detections of vinylamine and ethylamine, respectively, dimethylamine has become a promising target fo…
View article: Rotational spectroscopy of mono-deuterated oxirane (<i>c</i>-C2H3DO) and its detection towards IRAS 16293−2422 B
Rotational spectroscopy of mono-deuterated oxirane (<i>c</i>-C2H3DO) and its detection towards IRAS 16293−2422 B Open
We prepared a sample of mono-deuterated oxirane and studied its rotational spectrum in the laboratory between 490 and 1060 GHz in order to improve its spectroscopic parameters and consequently the calculated rest frequencies of its rotatio…
View article: LLWP -- A new Loomis-Wood Software at the Example of Acetone-13C1
LLWP -- A new Loomis-Wood Software at the Example of Acetone-13C1 Open
Acetone-13C1 is a complex organic molecule with two internal methyl (-CH3) rotors having relatively low effective barriers to internal rotation of about 249 cm-1. This leads to two low-lying torsional modes and five internal rotation compo…
View article: Rotational spectroscopy of<i>n</i>-propanol:<i>Aa</i>and<i>Ag</i>conformers
Rotational spectroscopy of<i>n</i>-propanol:<i>Aa</i>and<i>Ag</i>conformers Open
Context. The primary alcohol n-propanol (i.e., normal-propanol or propan-1-ol; C 3 H 7 OH) occurs in five different conformers: Ga, Gg, Gg' , Aa, and Ag. All rotational spectra of the three conformers of the G family are well described, ma…
View article: Rotational and rovibrational spectroscopy of CD$_3$OH with an account of CD$_3$OH toward IRAS 16293$-$2422
Rotational and rovibrational spectroscopy of CD$_3$OH with an account of CD$_3$OH toward IRAS 16293$-$2422 Open
Solar-type protostars harbor highly deuterated complex organics. While this degree of deuteration may provide important clues in studying the formation of these species, spectroscopic information on multiply deuterated isotopologs is often…
View article: Rotational and rovibrational spectroscopy of CD<sub>3</sub>OH with an account of CD<sub>3</sub>OH toward IRAS 16293−2422
Rotational and rovibrational spectroscopy of CD<sub>3</sub>OH with an account of CD<sub>3</sub>OH toward IRAS 16293−2422 Open
Solar-type protostars have been shown to harbor highly deuterated complex organics, as evidenced, for instance, by the high relative abundances of doubly and triply deuterated isotopologs. While this degree of deuteration may provide impor…
View article: NEW MEASUREMENTS AND ASSIGNMENTS IN THE v<sub>t</sub> = 0, 1, 2 TORSIONAL STATES OF <span class="roman">CD</span><sub><span class="roman">3</span></sub><span class="roman">OH</span> AND <span class="roman">CH</span><sub><span class="roman">3</span></sub><
NEW MEASUREMENTS AND ASSIGNMENTS IN THE v<sub>t</sub> = 0, 1, 2 TORSIONAL STATES OF <span>CD</span><sub><span>3</span></sub><span>OH</span> AND <span>CH</span><sub><span>3</span></sub>< Open
We present\\footnote{This work was done under support of the Deutsche Forschungsgemeinschaft and Volkswagen foundation. The assistance of Science and Technology Center in Ukraine is acknowledged (STCU partner project P756).} the results of…
View article: CHIRPED PULSE MILLIMETER WAVE SPECTROSCOPY OF COMPLEX MOLECULES
CHIRPED PULSE MILLIMETER WAVE SPECTROSCOPY OF COMPLEX MOLECULES Open
Our chirped pulse millimeter wave spectrometer for complex molecules of astrophysical interest is operational between 75 and 110 GHz, which is coincident with the Atacama Large Millimeter/Submillimeter Array (ALMA) Band 3. High sensitivity…
View article: LLWP - A NEW LOOMIS-WOOD SOFTWARE AT THE EXAMPLE OF PROPANONE-<sup>13</sup>C<sub>1</sub>
LLWP - A NEW LOOMIS-WOOD SOFTWARE AT THE EXAMPLE OF PROPANONE-<sup>13</sup>C<sub>1</sub> Open
Spectra of complex molecules are dense and complicated, especially if isotopologues, low-lying vibrationally excited states, hyperfine structure or other interactions are present. Analysis of these spectra can be difficult due to line conf…
View article: Rotational spectroscopy of isotopic cyclopropenone, c-H<sub>2</sub>C<sub>3</sub>O, and determination of its equilibrium structure
Rotational spectroscopy of isotopic cyclopropenone, c-H<sub>2</sub>C<sub>3</sub>O, and determination of its equilibrium structure Open
Context. Cyclopropenone was first detected in the cold and less dense envelope of the giant molecular cloud Sagittarius B2(N). It was found later in several cold dark clouds and it may be possible to detect its minor isotopic species in th…
View article: Rotational spectrum of isotopic methyl mercaptan, <sup>13</sup>CH<sub>3</sub>SH, in the laboratory and towards Sagittarius B2(N2)
Rotational spectrum of isotopic methyl mercaptan, <sup>13</sup>CH<sub>3</sub>SH, in the laboratory and towards Sagittarius B2(N2) Open
Methyl mercaptan (CH 3 SH) is a known interstellar molecule with abundances high enough that the detection of some of its minor isotopologues is promising. The present study aims to provide accurate spectroscopic parameters for the 13 CH 3…
View article: Investigations into the rotational spectrum of isotopic methyl mercaptan, (13)CH3SH, in the laboratory and towards Sagittarius B2(N2)
Investigations into the rotational spectrum of isotopic methyl mercaptan, (13)CH3SH, in the laboratory and towards Sagittarius B2(N2) Open
Methyl mercaptan (CH3SH) is a known interstellar molecule with abundances high enough that the detection of some of its minor isotopologues is promising. The present study aims at providing accurate spectroscopic parameters for the (13)CH3…