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3 results for “rotational spectroscopy”
Dataset related to the publication "Measurement and assignment of J = 5 to 9 rotational energy levels in the 9070-9370 cm-1 range of methane using optical frequency comb double-resonance spectroscopy"
<p>The files contain the normalized interleaved double-resonance spectra recorded with four different pump transitions, indicated in the file name. The first column is the wavenumber, the second column is the transmission intensity.</p>
Rotational spectroscopy of CH3OD with a re-analysis of CH3OD toward IRAS 16293 - 2422
<p>Supplementary material for the article 'Rotational spectroscopy of CH3OD with a re-analysis of CH3OD toward IRAS 16293 - 2422' by V.V. Ilyushin, H.S.P. Muller, M.N. Drozdovskaya, J.K. Jorgensen, S. Bauerecker, C. Maul, R. Porohovoi, E.A. Alekseev, O. Dorovskaya, O. Zakharenko, F. Lewen, S. Schlemmer, L.-H. Xu, and R.M. Lees accepted for publication by Astronomy and Astrophysics.</p> <p>ADC_Keywords: Interstellar medium; Spectra, millimetric/submm; Spectroscopy</p> <p>Keywords: Molecular data - Methods: laboratory: molecular - Techniques: <br>spectroscopic - ISM: molecules - Astrochemistry - ISM: individual objects: <br>IRAS 16293 - 2422</p> <p>Abstract:</p> <p>We have started a measurement campaign of numerous methanol isotopologs in <br>low-lying torsional states in order to provide extensive line lists for radio <br>astronomical observations from an adequate spectroscopic model and to <br>investigate how the intricate vibration-torsion-rotation interactions manifest <br>themselves in the spectra of different isotopic species. After CD3OH and CD3OD, <br>we turn our focus to CH3OD, which is an important species for studying <br>deuteration in prestellar cores and envelopes that enshroud protostars. <br>Deuteration, in turn, is frequently viewed as a diagnostic tool for star <br>formation. The present measurements were obtained in two spectroscopic <br>laboratories and cover large fractions of the 34 GHz-1.35 THz range. We <br>employed a torsion-rotation Hamiltonian model for our analysis that is based <br>on the rho-axis method as in previous studies. The resulting model describes <br>the ground and first excited torsional states of CH3OD well up to quantum <br>numbers J </= 51 and Ka </= 18. We derived a line list for radio-astronomical<br>observations from this model that is accurate up to at least 1.35 THz and <br>should be sufficient for all types of radio astronomical searches for this <br>methanol isotopolog in these two lowest torsional states. This line list was <br>applied to a reinvestigation of CH3OD in data from the Protostellar <br>Interferometric Line Survey (PILS) of IRAS 16293-2422 obtained with the Atacama <br>Large Millimeter/submillimeter Array (ALMA). The new accurately determined <br>value for the column density of CH3OD implies that the deuteration in <br>methanol differs in its two functional groups by a factor of ~7.5.</p> <p><br>Description:<br>Table C1 contains assigned microwave transitions of the CH3OD spectrum used<br>in the analysis. Source of data: Khar - Kharkov spectrometer, present work;<br>Koln - Cologne spectrometers, present work; for other source codes (B, C, D, <br>E, L, T, W) see Duan, Y. B., Ozier, I., Tsunekawa, S., & Takagi, K. 2003, <br>J. Mol. Spectrosc., 218, 95</p> <p>Table C2 contains assigned FIR transitions of the CH3OD spectrum used in<br>the analysis. Source of data: Mukhopadhyay, I. 2021, Infrared Phys. Technol., <br>116, 103605.</p> <p>Table C3 contains predicted transitions of the ground and first excited <br>torsional states of CH3OD in the frequency range from 1 GHz up to 2 THz <br>with J up to 55 and |Ka| up to 21. The m values 0/1 and -3/-2 correspond to <br>A/E transitions of the vt = 0 and 1 torsional states, respectively. We limit <br>our calculations to transitions for which uncertainties are less than 0.1 MHz.</p> <p>Table C4 contains torsion-rotation part Qrt(T) of the total internal partition <br>function Q(T)=Qv(T)*Qrt(T), calculated for CH3OD from first principles using <br>the parameter set of Table A.1. In the calculation the states up to J=65 and <br>vt=11 were included. The vibrational part Qv(T) (omitting the torsional <br>vibration since it is taken into account in Qrt) may be estimated in <br>the harmonic approximation using the vibrational frequencies reported <br>by T. Schimanouchi, Tables of Molecular Vibrational Frequencies, Vol. I: <br>consolidated (National Bureau of Standards, Washington, DC, 1972), pp. 1-160. </p> <p> </p> <p>File Summary:<br>-----------------------------------------------------------------------------------------------------------------------<br> FileName Lrecl Records Explanations<br>-----------------------------------------------------------------------------------------------------------------------<br>readme.txt 80 <br>tablec1.dat 75 11118 Assigned microwave transitions of the CH3OD <br> spectrum used in the analysis. <br>tablec2.dat 71 5465 Assigned FIR transitions of the CH3OD spectrum <br> used in the analysis. <br>tablec3.dat 87 25111 Predicted transition frequencies of the ground and <br> first excited torsional states of CH3OD in the <br> frequency range from 1 GHz up to 2 THz.<br>tablec4.dat 16 30 Torsion-rotation part Qrt(T) of the total internal <br> partition function Q(T)=Qv(T)*Qrt(T), calculated <br> for CH3OD from first principles.<br>------------------------------------------------------------------------------------------------------------------------</p>
The catalogue of "MaNGA DynPop - II. Global stellar population, gradients, and star-formation histories from integral-field spectroscopy of 10K galaxies: link with galaxy rotation, shape, and total-density gradients"
<p><strong>NOTE: Three parameters related to dust extinction ("delta_Map", "Fred_tot_Map", "Fred_gal_Map") in v1 catalogue are incorrectly saved, we have updated the catalogue in <a href="https://zenodo.org/records/15742825">https://zenodo.org/records/15742825</a> .</strong></p> <p> </p> <p>This catalogue is related to the paper "<strong>MaNGA DynPop - II. Global stellar population, gradients, and star-formation histories from integral-field spectroscopy of 10K galaxies: link with galaxy rotation, shape, and total-density gradients</strong>" by <strong>Lu et al. </strong><a href="https://ui.adsabs.harvard.edu/abs/2023MNRAS.tmp.2611L/abstract">https://ui.adsabs.harvard.edu/abs/2023MNRAS.tmp.2611L/abstract</a>. In this paper, we analyze the stellar population properties and star formation histories for over 10,000 MaNGA galaxies.</p> <p>Below are the descriptions of the files: </p> <ul> <li><strong>DynPop2_SPSFH_v1.hdf5 </strong>A HDF5 file containing the catalogue.</li> <li><strong>HDF5_reading_script.py</strong> A Python script to read the catalogue from the HDF5 file.</li> <li><strong>SP_catalog_explanation.pdf</strong> The data explanations for the catalogue, also see Table B1 in the paper. </li> </ul>
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