|کد مقاله||کد نشریه||سال انتشار||مقاله انگلیسی||ترجمه فارسی||نسخه تمام متن|
|5426984||1397241||2018||11 صفحه PDF||سفارش دهید||دانلود کنید|
- Absolute f-values are measured for VUV bands of OH and OD.
- Line broadening indicates a lifetime of 20ps for the D2Î£â(v=0) and D2Î£â(v=1) levels.
- A local perturbation level of OH D2Î£â(v=0) causes level shifts and increased widths.
Vacuum-ultraviolet (VUV) photoabsorption spectra were recorded of the A2Î£+(vâ²=0)âX2Î (vâ²â²=0),D2Î£â(vâ²=0)âX2Î (vâ²â²=0) and D2Î£â(vâ²=1)âX2Î (vâ²â²=0) bands of the OH and OD radicals generated in a plasma-discharge source using synchrotron radiation as a background continuum coupled with the VUV Fourier-transform spectrometer on the DESIRS beamline of synchrotron SOLEIL. High-resolution spectra permitted the quantification of transition frequencies, relative f-values, and natural line broadening. The f-values were absolutely calibrated with respect to a previous measurement of A2Î£+(vâ²=0)âX2Î (vâ²â²=0) (Wang etÂ al., 1979). Lifetime broadening of the excited D2Î£â(v=0) and D2Î£â(v=1) levels is measured for the first time and compared with previous experimental limits, and implies a lifetime 5 times shorter than a theoretical prediction (van der Loo and Groenenboom, 2005). A local perturbation of the D2Î£â(v=0) level in OH was found.
Journal: Journal of Quantitative Spectroscopy and Radiative Transfer - Volume 204, January 2018, Pages 12-22