Schematic representation of acetylene states in the energy range (Refs. 10–12).
The IR emission spectra recorded at and spectral resolution at different delay times after the exciting laser pulse, 1–8: 1, 3, 10, 20, 50, 200, 500, and delays.
Time evolution of the IR emission signal measured at ; traces 1–7 correspond to 7157, 6506, 5223, 3864, 3262, 1962, and bands, respectively.
Pressure plots of the emission buildup and decay rates, and ; traces 1–7 correspond to 7157, 6506, 5223, 3864, 3262, 1962, and bands, respectively.
Time evolution of the IR emission signal measured at for the superposition of the two lowest-energy bands (606 and ).
Pressure plots of the emission buildup rate, , and emission decay rates, and , for the two lowest-energy emission bands.
(a) CRD traces measured for the acetylene pressure of without and with the excitation pulse at (probe pulse at ); (b) difference between traces with and without excitation; (c) kinetics of the difference signal with the intrinsic CRD decay subtracted, calculated as ; (d) kinetics of the intermediate absorption, calculated as .
The vs (c) and vs dependences.
(a) CRD intermediate absorption spectrum measured for the acetylene pressure of excited at , resolution, represented in absolute optical density scale; (b) rotational line at recorded with resolution of ; (c) rotational line at recorded with resolution of in the presence of a magnetic field.
Experimental and theoretical IR emission traces for the band. Theoretical calculations used Eq. (26).
Correlation between the Einstein coefficient value and the decay rate constant for the IR emission bands. The lines were drawn using linear and square-root regressions.
Parameters of the IR emission dynamics; the models are described in the text.
Buildup and decay rate constants for the probe wavelength of .
Frequencies of the fundamental modes and anharmonicity parameter values of the acetylene ground state.
Proposed assignments of the observable IR transitions.
Values of the and parameters for different subbands of the transition.
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