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1.
J.-M Flaud J Orphal P.-M Flaud C Piccolo 《Journal of Quantitative Spectroscopy & Radiative Transfer》2003,77(4):355-364
Nitric acid which is an important NOx atmospheric reservoir molecule exhibits a strong absorption in the spectral region. Since this region, which corresponds to an atmospheric window, is one of the most commonly used for the retrieval of HNO3 in the atmosphere it is essential to have the best possible corresponding spectral parameters. Updates of these spectral line parameters were recently performed in the last versions of the atmospheric databases. They concern the line positions and intensities not only of the two interfering cold bands ν5 and 2ν9 but also of the ν5+ν9−ν9 hot band. This hot band exhibits indeed a sharp and strong Q branch at which is clearly observable in atmospheric spectra and is used for the retrievals. However, in spite of these recent updates, it proved that the spectral parameters of the hot band are not accurate enough to reproduce accurately the observed atmospheric HNO3 absorption in ATMOS spectra. The present paper is dedicated to a more accurate analysis of this hot band using new laboratory high-resolution (0.002-) Fourier transform spectra. As a consequence, new and more precise line positions and line intensities (about 35% weaker than in HITRAN2K) were derived leading to a significant improvement in the simulation of atmospheric spectra. 相似文献
2.
High-resolution Fourier transform infrared spectra of natural trans-ClHCCHF and of its isotopologue trans-ClHCCDF have been recorded in the region between 700 and 1150 cm−1 with the purpose to analyze the ν11 fundamental of the main species and the ν10 of its deuterated compound. Both bands, of symmetry species A″, present c-type envelope absorptions. Beside the expected features, the K structure of the P(J), Q(J), and R(J) manifolds was resolved and identified; the assignment of the rovibrational transitions was extended up to J = 92 and Ka = 13 for the trans-35ClHCCHF and up to J = 86 and Ka = 10 for trans-35ClHCCDF. More than 2900 and 2700 lines for the main and deuterated species, respectively, were analyzed by a least-squares procedure and reliable spectroscopic molecular parameters were determined for both isotopologues. 相似文献
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The ν3 fundamental band (CO stretch) of HDCO at 1724 cm?1 has been studied using both conventional infrared absorption and CO laser Stark spectroscopy. In addition to the excited-state (v3 = 1) rotational constants, improved constants for the ground state of HDCO have been obtained by combining previous microwave data with some infrared combination differences. The following constants were determined:
Constant | Ground state | state | Units |
1724.267 | cm?1 | ||
198 119.75 | 198 210.4 | MHz | |
34 910.646 | 34 676.6 | MHz | |
29 561.488 | 29 331.3 | MHz | |
2.3302 | 2.3486 | D | |
0.195 | 0.190 | D |
4391.3230(84) | 0.582(154) | 2.4830(32) | |
4391.1921(94) | 0.594(179) | 2.4073(37) |
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