التفاصيل البيبلوغرافية
| العنوان: |
Absolute line strength measurements of HO2 radical in the OO-stretching fundamental band between 1088 and 1124 cm−1 using time-resolved dual-comb spectroscopy. |
| المؤلفون: |
Chang, Che-Wei1,2,3 (AUTHOR), Chen, I-Yun1,4 (AUTHOR), Luo, Pei-Ling1 (AUTHOR) plluo@gate.sinica.edu.tw |
| المصدر: |
Journal of Chemical Physics. 1/21/2025, Vol. 162 Issue 3, p1-9. 9p. |
| مصطلحات موضوعية: |
*RADICALS (Chemistry), *DATABASES, *GEOMETRIC modeling, *SPECTROMETERS, *MOLECULES |
| مستخلص: |
Absolute line strength measurements of hydroperoxyl (HO2) radical in the OO-stretching (ν3) fundamental band have been performed by means of mid-infrared time-resolved dual-comb spectroscopy. By employing two sets of dual-comb spectrometers, high-resolution time-resolved spectra of HO2 and HCl, formed in the photolysis reaction system of Cl2/CH3OH/O2, could be, respectively, measured near 1123 and 3059 cm−1. With kinetic simulations, spectral analysis of both HO2 and HCl, as well as the accurate line strength of the HCl R(9) transition at 3059.316 cm−1, an absolute line strength of the ν3 131,13 ← 121,12 F1,2 transitions in HO2 at 1122.983 cm−1 was first determined to be 1.80 × 10−20 cm molecule−1 with a small uncertainty down to 4% under the conditions with low initial concentrations of Cl radical (1.63–1.81 × 1013 molecule cm−3). Furthermore, broadband high-resolution spectra of the ν3 fundamental band of HO2 were recorded in the range of 1088–1124 cm−1 with an average spectral resolution of 0.002 cm−1. By contour fitting the measured broadband spectra with PGOPHER, the line strengths of hundreds of rovibrational transitions were obtained relative to the well-determined HO2 lines at 1122.983 cm−1, and those values were observed to be higher than those tabulated in the HITRAN database by a factor of ∼2.8. Moreover, the absolute band strength of the ν3 fundamental band in HO2 was derived to be 22.3 km mol−1 with an uncertainty of 5%. This work providing precise and detailed spectral data would be crucial in revisiting the theoretical modeling of HO2 geometry and updating the database of the HO2 radical. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
Academic Search Index |