Spectroscopic study of methane in the v1 + v4 band broadened by itself, air and hydrogen

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dc.contributor.authorArifuzzaman, Md
dc.contributor.authorUniversity of Lethbridge. Faculty of Arts and Science
dc.contributor.supervisorGerken, Michael
dc.date.accessioned2018-08-23T15:56:31Z
dc.date.available2018-08-23T15:56:31Z
dc.date.issued2018
dc.degree.levelMastersen_US
dc.description.abstractThis thesis presents the temperature-dependent line-shape studies of methane broadened by itself, air and hydrogen, which is identified as the second most important anthropogenic greenhouse gas in the Earth’s atmosphere due to its high global warming potential. A set of 14 laboratory spectra of pure methane and lean mixtures of methane in air were recorded over a range of temperatures from 148.4 to 298.4 K and total sample pressures from 4.5 to 385 Torr using a high-resolution Fourier Transform Spectrometer (FTS) at the Jet Propulsion Laboratory (JPL), California. A coolable absorption gas cell with the optical path length 20.38 cm was used in the recording of methane-air spectra. A non-linear least-squares multi-spectrum fitting program called ‘Labfit’ was used to determine the Lorentz half-width, pressure-induced shift coefficients along with their temperature dependences, speed-dependence parameters and line-mixing coefficients due to self- and air-broadening of methane in its strongest band v1 + v4. A set of 18 laboratory spectra of methane broadened by itself and hydrogen were also recorded at various temperatures (148.4-298.4 K) and pressures (0.12-385 Torr) using an FTS at JPL. Various line-shape parameters such as line positions, intensities, self- and air-broadened line widths and pressure-induced shifts along with their temperature dependences are reported in the v1 + v4 band of methane. A Speed-Dependent Voigt Profile (SDVP) was implemented in the retrieval of line parameters in both cases. The linemixing coefficients were quantified using the off-diagonal relaxation matrix element formalism. The off-diagonal relaxation-matrix coefficients were determined due to self-, air- and H2-broadening of methane using Labfit program.en_US
dc.embargoNoen_US
dc.identifier.urihttps://hdl.handle.net/10133/5192
dc.language.isoen_USen_US
dc.proquest.subject0609en_US
dc.proquest.subject0605en_US
dc.proquest.subject0606en_US
dc.proquestyesYesen_US
dc.publisherLethbridge, Alta. : Universtiy of Lethbridge, Department of Physics and Astronomyen_US
dc.publisher.departmentDepartment of Physics and Astronomyen_US
dc.publisher.facultyArts and Scienceen_US
dc.relation.ispartofseriesThesis (University of Lethbridge. Faculty of Arts and Science)en_US
dc.subjectMethane -- Spectra -- Researchen_US
dc.subjectAtmospheric methane -- Researchen_US
dc.subjectMolecular spectroscopyen_US
dc.subjectSpectral line broadeningen_US
dc.subjectGreenhouse gases -- Researchen_US
dc.subjectmethane broadeningen_US
dc.subjectmethane spectraen_US
dc.subjectmethane spectroscopic studiesen_US
dc.subjecttemperature dependent line shape studiesen_US
dc.subjectDissertations, Academic
dc.titleSpectroscopic study of methane in the v1 + v4 band broadened by itself, air and hydrogenen_US
dc.typeThesisen_US
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