Laser induced vibration-rotation fluorescence and infrared forbidden transitions in acetylene

Jungner, Peter; Halonen, Lauri
August 1997
Journal of Chemical Physics;8/1/1997, Vol. 107 Issue 5, p1680
Academic Journal
Laser induced fluorescence method has been used to study highly excited vibrational overtones in acetylene. A sample cell has been placed inside a Ti:Sapphire ring laser cavity and the total fluorescence collected by a parabolic mirror has been dispersed by a high-resolution FTIR spectrometer. The laser has pumped specific rotational states of the CH stretching vibrational overtone state ν1+3ν3(Σu+) and transitions to the symmetric state ν1+2ν3(Σg+) have been observed. The observations allow determining both the vibrational term value and the rotational constant of the symmetric state, which is not accessible from the ground vibrational state by one-photon absorption. The parameters obtained are in excellent agreement with simple local mode predictions..


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