High resolution rotational CARS spectrum of oxygen
| Autor: | Nathan H. Rich, Joseph W. Nibler, Kirk W. Brown |
|---|---|
| Rok vydání: | 1992 |
| Předmět: |
Physics
Spectrometer business.industry Rotational transition Diatomic molecule Atomic and Molecular Physics and Optics symbols.namesake Laser linewidth Optics symbols Physical and Theoretical Chemistry Atomic physics Raman spectroscopy Hamiltonian (quantum mechanics) business Magnetic dipole Spectroscopy Microwave |
| Zdroj: | Journal of Molecular Spectroscopy. 151:482-492 |
| ISSN: | 0022-2852 |
| DOI: | 10.1016/0022-2852(92)90581-8 |
| Popis: | A low frequency, high resolution CARS spectrometer is described which has been used to resolve the closely spaced Δ N = 2, Δ J = 2 triplets of oxygen in the pure rotational Raman spectrum. The transition frequencies and intensities from N = 1–19 are extracted from the experimental data with the aid of spectral simulation routines that account for the ∥χ∥ 2 interference effects and the contribution of various line broadening mechanisms to the CARS spectrum. The frequencies match well those predicted using molecular constants obtained from magnetic dipole microwave studies and a Hamiltonian appropriate to a coupling scheme intermediate between Hund's cases (a) and (b). A small, systematic discrepancy is observed between experimental and theoretical intensities which may result from a J dependent linewidth variation within each triplet. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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