The Far-Infrared Absorption Spectrum of HD<sup>16</sup>O: Experimental Line Positions, Accurate Empirical Energy Levels, and a Recommended Line List
The far-infrared absorption spectrum of monodeuterated water vapor, HD<sup>16</sup>O, is analyzed using three high-sensitivity absorption spectra recorded by high-resolution Fourier transform spectroscopy at the SOLEIL synchrotron facility. The gas sample was obtained using a 1:1 mixture...
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2024-11-01
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| author | Semen N. Mikhailenko Ekaterina V. Karlovets Aleksandra O. Koroleva Alain Campargue |
| author_facet | Semen N. Mikhailenko Ekaterina V. Karlovets Aleksandra O. Koroleva Alain Campargue |
| author_sort | Semen N. Mikhailenko |
| collection | DOAJ |
| description | The far-infrared absorption spectrum of monodeuterated water vapor, HD<sup>16</sup>O, is analyzed using three high-sensitivity absorption spectra recorded by high-resolution Fourier transform spectroscopy at the SOLEIL synchrotron facility. The gas sample was obtained using a 1:1 mixture of H<sub>2</sub>O and D<sub>2</sub>O leading to a HDO abundance close to 50%. The room temperature spectra recorded in the 50–720 cm<sup>−1</sup> range cover most of the rotational band. The sensitivity of the recordings allows for lowering by three orders of magnitude the detectivity threshold of previous absorption studies in the region. Line centers are determined with a typical accuracy of 5 × 10<sup>−5</sup> cm<sup>−1</sup> for well-isolated lines. The combined line list of 8522 water lines is assigned to 9186 transitions of the nine stable water isotopologues (H<sub>2</sub><sup>X</sup>O, HD<sup>X</sup>O, and D<sub>2</sub><sup>X</sup>O with X = 16, 17, and 18). Regarding the HD<sup>16</sup>O isotopologue, a total of 2443 transitions are presently assigned while about 530 absorption transitions were available prior to our SOLEIL recordings. The comparison with the HITRAN list of HD<sup>16</sup>O transitions is discussed in detail. The obtained set of accurate HD<sup>16</sup>O transition frequencies is merged with literature sources to generate a set of 1121 accurate empirical rotation–vibration energies for the first five vibrational states (000), (010), (100), (020), and (001). The comparison to the previous dataset from an IUPAC task group illustrates a gain in the average energy accuracy by more than one order of magnitude. Based on these levels, a recommended list of transitions between the first five vibrational states is proposed for HD<sup>16</sup>O in the 0–4650 cm<sup>−1</sup> frequency range. |
| format | Article |
| id | doaj-art-0a4977c207c74f469918f5eb5c57393e |
| institution | Kabale University |
| issn | 1420-3049 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | MDPI AG |
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| series | Molecules |
| spelling | doaj-art-0a4977c207c74f469918f5eb5c57393e2024-12-13T16:28:06ZengMDPI AGMolecules1420-30492024-11-012923550810.3390/molecules29235508The Far-Infrared Absorption Spectrum of HD<sup>16</sup>O: Experimental Line Positions, Accurate Empirical Energy Levels, and a Recommended Line ListSemen N. Mikhailenko0Ekaterina V. Karlovets1Aleksandra O. Koroleva2Alain Campargue3V.E. Zuev Institute of Atmospheric Optics, SB, Russian Academy of Science, 1, Academician Zuev Square, 634055 Tomsk, RussiaUniversity Grenoble Alpes, CNRS, LIPhy, 38000 Grenoble, FranceUniversity Grenoble Alpes, CNRS, LIPhy, 38000 Grenoble, FranceUniversity Grenoble Alpes, CNRS, LIPhy, 38000 Grenoble, FranceThe far-infrared absorption spectrum of monodeuterated water vapor, HD<sup>16</sup>O, is analyzed using three high-sensitivity absorption spectra recorded by high-resolution Fourier transform spectroscopy at the SOLEIL synchrotron facility. The gas sample was obtained using a 1:1 mixture of H<sub>2</sub>O and D<sub>2</sub>O leading to a HDO abundance close to 50%. The room temperature spectra recorded in the 50–720 cm<sup>−1</sup> range cover most of the rotational band. The sensitivity of the recordings allows for lowering by three orders of magnitude the detectivity threshold of previous absorption studies in the region. Line centers are determined with a typical accuracy of 5 × 10<sup>−5</sup> cm<sup>−1</sup> for well-isolated lines. The combined line list of 8522 water lines is assigned to 9186 transitions of the nine stable water isotopologues (H<sub>2</sub><sup>X</sup>O, HD<sup>X</sup>O, and D<sub>2</sub><sup>X</sup>O with X = 16, 17, and 18). Regarding the HD<sup>16</sup>O isotopologue, a total of 2443 transitions are presently assigned while about 530 absorption transitions were available prior to our SOLEIL recordings. The comparison with the HITRAN list of HD<sup>16</sup>O transitions is discussed in detail. The obtained set of accurate HD<sup>16</sup>O transition frequencies is merged with literature sources to generate a set of 1121 accurate empirical rotation–vibration energies for the first five vibrational states (000), (010), (100), (020), and (001). The comparison to the previous dataset from an IUPAC task group illustrates a gain in the average energy accuracy by more than one order of magnitude. Based on these levels, a recommended list of transitions between the first five vibrational states is proposed for HD<sup>16</sup>O in the 0–4650 cm<sup>−1</sup> frequency range.https://www.mdpi.com/1420-3049/29/23/5508water vapordeuterated waterfar infraredrotational spectrumdeuteriumline list |
| spellingShingle | Semen N. Mikhailenko Ekaterina V. Karlovets Aleksandra O. Koroleva Alain Campargue The Far-Infrared Absorption Spectrum of HD<sup>16</sup>O: Experimental Line Positions, Accurate Empirical Energy Levels, and a Recommended Line List Molecules water vapor deuterated water far infrared rotational spectrum deuterium line list |
| title | The Far-Infrared Absorption Spectrum of HD<sup>16</sup>O: Experimental Line Positions, Accurate Empirical Energy Levels, and a Recommended Line List |
| title_full | The Far-Infrared Absorption Spectrum of HD<sup>16</sup>O: Experimental Line Positions, Accurate Empirical Energy Levels, and a Recommended Line List |
| title_fullStr | The Far-Infrared Absorption Spectrum of HD<sup>16</sup>O: Experimental Line Positions, Accurate Empirical Energy Levels, and a Recommended Line List |
| title_full_unstemmed | The Far-Infrared Absorption Spectrum of HD<sup>16</sup>O: Experimental Line Positions, Accurate Empirical Energy Levels, and a Recommended Line List |
| title_short | The Far-Infrared Absorption Spectrum of HD<sup>16</sup>O: Experimental Line Positions, Accurate Empirical Energy Levels, and a Recommended Line List |
| title_sort | far infrared absorption spectrum of hd sup 16 sup o experimental line positions accurate empirical energy levels and a recommended line list |
| topic | water vapor deuterated water far infrared rotational spectrum deuterium line list |
| url | https://www.mdpi.com/1420-3049/29/23/5508 |
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