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Multispectrum analysis of 12ch4 in the v4 band: i. air-broadened half widths, pressure-induced shifts, temperature dependences and line mixing
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Benner Sr., D. Chris Predoi-Cross, Adriana Smith, MaryAnn H. Venkataraman, Malathy Devi |
| Copyright Year | 2009 |
| Description | Lorentz air-broadened half widths, pressure-induced shifts and their temperature dependences have been measured for over 430 transitions (allowed and forbidden) in the v4 band of (CH4)-12 over the temperature range 210 to 314 K. A multispectrum non linear least squares fitting technique was used to simultaneously fit a large number of high-resolution (0.006 to 0.01/cm) absorption spectra of pure methane and mixtures of methane diluted with dry air. Line mixing was detected for pairs of A-, E-, and F-species transitions in the P- and R-branch manifolds and quantified using the off-diagonal relaxation matrix elements formalism. The measured parameters are compared to air- and N2-broadened values reported in the literature for the v4 and other bands. The dependence of the various spectral line parameters upon the tetrahedral symmetry species and rotational quantum numbers of the transitions is discussed. All data used in the present work were recorded using the McMath-Pierce Fourier transform spectrometer located at the National Solar Observatory on Kitt Peak. |
| File Size | 692145 |
| Page Count | 43 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20090023548 |
| Archival Resource Key | ark:/13960/t6741rj2m |
| Language | English |
| Publisher Date | 2009-01-01 |
| Access Restriction | Open |
| Subject Keyword | Solar Physics Methane Pressure Dependence Fourier Transformation Spectrometers Absorption Spectra Spectral Line Width Solar Observatories Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
