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• W2064707918 abstract "First high-resolution infrared absorption spectra in the fundamental symmetric/asymmetric CH stretching region of isotopically substituted methyl radical, CH2D, are reported and analyzed. These studies become feasible in the difference frequency spectrometer due to (i) high density radical generation via dissociative electron attachment to CH2DI in a discharge, (ii) low rotational temperatures (23 K) from supersonic cooling in a slit expansion, (iii) long absorption path length (64 cm) along the slit axes, and (iv) near shot noise limited absorption sensitivity ($5; times ;10^{ - 7} /sqrt{rm Hz}$5×10−7/ Hz ). The spectra are fully rovibrationally resolved and fit to an asymmetric top rotational Hamiltonian to yield rotational/centrifugal constants and vibrational band origins. In addition, the slit expansion collisionally quenches the transverse velocity distribution along the laser probe direction, yielding sub-Doppler resolution of spin-rotation structure and even partial resolution of nuclear hyperfine structure for each rovibrational line. Global least-squares fits to the line shapes provide additional information on spin-rotation and nuclear hyperfine constants, which complement and clarify previous FTIR studies [K. Kawaguchi, Can. J. Phys. 79, 449 (2001)]10.1139/p00-093 of CH2D in the out-of-plane bending region. Finally, analysis of the spectral data from the full isotopomeric CHmD3–m series based on harmonically coupled Morse oscillators establishes a predictive framework for describing the manifold of planar stretching vibrations in this fundamental combustion radical." @default.
• W2064707918 created "2016-06-24" @default.
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• W2064707918 date "2012-06-20" @default.
• W2064707918 modified "2023-10-14" @default.
• W2064707918 title "Sub-Doppler infrared spectroscopy of CH₂D radical in a slit supersonic jet: Isotopic symmetry breaking in the CH stretching manifold" @default.
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• W2064707918 doi "https://doi.org/10.1063/1.4717620" @default.
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