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2 results for “self-broadening”
Measurement database and line parameter database for air- and self-broadened H2O in the 5970-6575 cm-1 region
<p>Air-broadened H2O measurements at 294 K, total pressure range 250-1000 mbar, and self-broadened measurements at 294 K, 10 and 20 mbar, and analysis were carried out within the ESA-funded project ISOGG (Improved Spectroscopy for satellite measurements Of Greenhouse Gases).</p> <p>The measurement database is in “H2O_self-_and_air-broadened_measurements_5970-6575cm-1.zip” and the line parameter database in “H2O_self-_and_air-broadening_line_parameters_5970-6575cm-1.zip”. The readme file is “Measurement database and line parameter database for air- and self-broadened H2O in the 5970-6575 cm-1 region - Readme.docx”.</p> <p>Definitions and units of line parameters are in accordance with the HITRAN database and can be found in the readme file in <a href="https://zenodo.org/records/1009126">ESA SEOM-IAS – Spectroscopic parameters database 2.3 µm region (zenodo.org)</a>.</p> <p><span>The systematic line position uncertainty is 1.7x10<sup>-5</sup> cm<sup>-1</sup>.</span></p>
Line parameter database H2O self-broadened 700-2000 cm-1
<p><strong>DLR line parameter database for self-broadened H<sub>2</sub>O in the 700 – 2000 cm<sup>-1</sup> region.</strong></p> <p>New self-broadened H<sub>2</sub>O measurements and analysis were performed with the aim of determining the H<sub>2</sub>O self-continuum. Zenodo serves as a repository for the line parameter database.</p> <p>Measurements in the spectral range of 700 – 2000 cm⁻¹ were conducted using a Bruker 125HR Interferometer with an attached multi-reflection cell. The spectral resolution was 0.003 cm⁻¹. Measurements were corrected regarding the wavenumber axis (→ N<sub>2</sub>O reference lines [1]), detector non-linearity, thermal self-radiation, and the instrumental line profile function (→ LINEFIT [2]). For the preparation of the parameter database, measurements were analyzed using pure H₂O pressures between 0.003 – 20 mbar, path lengths between 14 – 161 m, and temperatures of 294.2 K and 353.2 K. The line profile function of a quadratic speed-dependent Voigt which was extended for Rosenkranz line mixing was used. The following line parameters were determined for the four most abundant H₂O isotopologues H<sub>2</sub><sup>16</sup>O (main isotopologue), H<sub>2</sub><sup>18</sup>O, H<sub>2</sub><sup>17</sup>O, HD<sup>16</sup>O:</p> <table> <tbody> <tr> <td>Line position</td> <td><sub>ν0</sub></td> </tr> <tr> <td>Line intensity</td> <td>S</td> </tr> <tr> <td>Pressure self-broadening parameter</td> <td><sub>γ0,self</sub></td> </tr> <tr> <td>Speed-dependence parameter of pressure self-broadening</td> <td><sub>γ2,self</sub></td> </tr> <tr> <td>Temperature exponent of pressure self-broadening</td> <td>n<sub>self</sub></td> </tr> <tr> <td>Pressure self-shift parameter</td> <td><sub>δ0,self</sub></td> </tr> <tr> <td>Temperature dependence of pressure self-shift</td> <td><sub>δ<strong><sup>T</sup></strong>0,self</sub></td> </tr> <tr> <td>First order Rosenkranz self-line-mixing parameter @ 296 K</td> <td>Y<sub>self</sub></td> </tr> <tr> <td>Temperature dependence of first order Rosenkranz self-line-mixing</td> <td>Y<sup>T1</sup><sub>self</sub></td> </tr> </tbody> </table> <p> </p> <p> </p> <p><strong>Provided files:</strong></p> <p> </p> <p>Readme for database and provided files:</p> <p><strong>DLR_Database_Pure_H2O_700-2000_cm-1- Readme.docx</strong></p> <p>Detailed, commented version:</p> <p><strong>DLR_Database_Pure_H2O_700-2000_cm-1.xlsx</strong></p> <p>Version in extended HITRAN format:</p> <p><strong>DLR_Database_Pure_H2O_700-2000_cm-1.hit</strong></p> <p>List of occurring HITRAN references:</p> <p><strong>DLR_Database_Pure_H2O_700-2000_cm-1_HITRAN_references.html</strong></p>
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