Abstract

Laser-induced fluorescence studies have been made of the CH radical in atmospheric pressure flames of methane, oxygen, and nitrogen. Individual rotational levels within the υ′ = 0 and 1 vibrational levels of the A²Δ and B²Σ⁻ states are excited by a dye laser operating in the 380–440-nm region. Studies were made of collisional energy transfer pathways within and between the states, using rotationally resolved fluorescence scans. Rotational transfer occurred at a rate, dependent on rotational level, 2–5 times that of quenching. Vibrational transfer was slow but transfer between A(υ′ = 1) and B(υ′ = 0) took place at rates ~0.2 that of quenching.

© 1985 Optical Society of America

Picosecond investigation of the collisional deactivation of OH A²Σ⁺(v′ = 1, N′ = 4, 12) in an atmospheric-pressure flame

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Picosecond planar laser-induced fluorescence measurements of OH A² Σ⁺ (ν′ = 2) lifetime and energy transfer in atmospheric pressure flames

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Picosecond laser-induced fluorescence measurement of rotational energy transfer of OH A²Σ⁺ (v′ = 2) in atmospheric pressure flames

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Thermally assisted fluorescence of laser-excited OH A²Σ⁺ as a flame diagnostic tool

A. A. Neuber, J. Janicka, and E. P. Hassel
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