Written in English
Thesis (M.Sc), Dept. of Physics, University of Toronto.
|Contributions||May, A. D. (supervisor)|
|The Physical Object|
|Number of Pages||30|
Using quasi-cw stimulated Raman gain spectroscopy, the pressure broadening coefficients for the N 2 vibrational Q-branch transitions have been measured over the temperature range – K for the rotational components J = 4, 6, 8, 10, and The experimental results are fit to a simple power law to give an empirical formula for the temperature dependence of the pressure Cited by: Measurement and calculation of the Q‐branch spectrum of nitrogen using inverse Raman spectroscopy and cw Raman‐induced polarization spectroscopy January Journal of Raman Spectroscopy 39(1. This work covers principles of Raman theory, analysis, instrumentation, and measurement, specifying up-to-the-minute benefits of Raman spectroscopy in a variety of industrial and academic fields, and how to cultivate growth in new disciplines. It contains case studies that illustrate current techniques in data extraction and analysis, as well as over drawings and photographs that 5/5(2). The Raman Q branch of N2 has been recorded at room temperature in the pressure range – bar, which corresponds to densities from to amagat.
Changes in the Raman spectra of N2, H2, and CO2 are studied in the range of – cm–1 depending on the concentration of surrounding CH4 molecules at a fixed medium pressure of 25 atm and temperature of K. It has been found that changes in the spectral characteristics of purely rotational H2 lines in a CH4 medium are negligible, while the Q-branches of the v1/2v2 Fermi dyad in . vibration–rotation spectra will not be treated in this book. Depending on the molecule, the same or diﬀerent vibrational transitions are probed in IR and Raman spectroscopy and both techniques provide complemen-tary information in many instances. Hence, IR and Raman spectra are usually plotted in an analogous way to facilitate comparison. The Q-branch can be observed in polyatomic molecules and diatomic molecules with electronic angular momentum in the ground electronic state, e.g. nitric oxide, NO. Most diatomics, such as O 2, have a small moment of inertia and thus very small angular momentum and yield no Q-branch. j‐2 = B(4j ‐2), for anti‐Stokes Raman scattering (Δj = ‐2) (Note: j is the rotatilional quantum number of the iiilinitial state) Note also that we’ve introduced a constant value, B = ħ2/2I. OK, we can determine that the energy spacing between adjacent lines in our spectrum.
No values of Q branch line-mixing coefficients liave been reported in llie literature. Line overlap lias been studied in infra- iei.1 Mbraiional spectra of CO [36,37]. We have reported that line shifts in N3 are less than ! cm ' aim l (6j. For the CO Q branch we do oh^eive a small, perhaps/-dependent, shift. For ex- ample. 0. A temperature and pressure dependent study of coherent anti‐Stokes Raman scattering (CARS) Q branch spectra of molecular nitrogen and oxygen has been conducted. Spectra at pressures up to MPa and in the temperature range K. A systematic study of the polarizability and polarizability derivatives of N 2 is undertaken as a function of basis set and level of correlation treatment. The value obtained for the ratio of derivatives (r e β′ e /β e) of the polarizability anisotropy β=α ∥ −α ⊥ is ±, which is . model atmospheres used in this study. We present the results of radiative transfer calculations for two test cases—a monochro-matic light source and a ﬂat photon spectrum with an absorption line in Section 4. The goal of these test cases is to provide insight into the way in which Raman scattering affects the reﬂected light from planets.