𝔖 Bobbio Scriptorium
✦   LIBER   ✦

The Intensities of Methane in the 3–5 μm Region Revisited

✍ Scribed by L. Féjard; J.P. Champion; J.M. Jouvard; L.R. Brown; A.S. Pine

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
404 KB
Volume
201
Category
Article
ISSN
0022-2852

No coin nor oath required. For personal study only.

✦ Synopsis

The analysis of the linestrengths of the infrared spectrum of methane (12 and 13) in the 3-5 m region has been revisited on the basis of new measurements from Fourier transform spectra recorded at Kitt Peak under various optical densities. A simultaneous fit of these new data with previously reported tunable difference-frequency laser data has been done. An effective transition moment model in tensorial form up to the third order of approximation within the Pentad scheme has been used. The standard deviations achieved are very close to the experimental precision: 3 and 1.5%, respectively, for the two sets of data for the 12 CH 4 molecule, representing a substantial improvement with respect to earlier studies. The integrated bandstrengths obtained in the present work differ from previously reported values by factors ranging from Ϫ5 to ϩ6%. The correction for the 3 band, the strongest band of the Pentad system, is ϩ2% with respect to the study of Hilico et al.

📜 SIMILAR VOLUMES

Absolute Line Intensities in Acetylene:
Absolute Line Intensities in Acetylene: The 1.5-μm Region
✍ R El Hachtouki; J.Vander Auwera 📂 Article 📅 2002 🏛 Elsevier Science 🌐 English ⚖ 403 KB

We measured 305 absolute line intensities in the ν 1 + ν 3 ( + u )-0( + g ) band of 12 C 2 H 2 and 13 C 12 CH 2 and the bands of the main isotopomer, all observed near 1.5 µm. The absolute intensity of these bands are respectively 6.4882 (34), 0.12337 (10), 0.083746 (71), 0.58771 (28), and 0.32126

CO2Emission in the 4-μm Region: The (211
CO2Emission in the 4-μm Region: The (2111)3→ (2110)3Transition Revisited
✍ D. Bailly; S.A. Tashkun; V.I. Perevalov; J.L. Teffo; PH. Arcas 📂 Article 📅 1998 🏛 Elsevier Science 🌐 English ⚖ 165 KB

From spectra recorded at a resolution of 0.020 cm 01 of the flame CH 4 / O 2 at low pressure, six new vibrational transitions in D£ 3 Å 1 with 2£ 1 / £ 2 Å 5 had been recently identified [ D. Bailly et al., J. Mol. Spectrosc. 182, 10 -17 ( 1996 ) ] based on the HITRAN 92 predictions. New calculation

Line Intensities in the ν6Band of CH3F a
Line Intensities in the ν6Band of CH3F at 8.5 μm
✍ Muriel Lepère; Ghislain Blanquet; Jacques Walrand; Jean-Pierre Bouanich 📂 Article 📅 1996 🏛 Elsevier Science 🌐 English ⚖ 318 KB

Infrared absolute line intensities of the nu6 band of CH3F have been measured around 8.5 μm using a diode-laser spectrometer. These line strengths were obtained by the equivalent width method and, for 13 lines, by fitting a Rautian profile to the measured shape of the lines. From these results, we h

Weak Combination Bands in the 3-μm Regio
Weak Combination Bands in the 3-μm Region of Ethane
✍ M. Hepp; M. Herman 📂 Article 📅 1999 🏛 Elsevier Science 🌐 English ⚖ 177 KB

The infrared spectrum of ethane in the region of the CH-stretching fundamental vibrations, between 2600 and 3300 cm Ϫ1 , was recorded with a Bruker IFS120HR Fourier transform spectrometer. Jet-cooled and room-temperature conditions were used at 0.01 and 0.005 cm Ϫ1 instrumental resolution, respectiv