Infrared-Microwave Double Resonance Spectroscopy of Tetrahedral Molecules Using a Tunable Diode Laser
A tetrahedral molecule has a vibrationally induced dipole moment in its triply degenerate vibrational state [1,2]. This dipole moment allows a pure rotational transition among the rotational manifold of the triply degenerate vibration. Such transitions have been observed in CH4, SiH4 and GeH4 by infrared-microwave double resonance. Because the lasers used in these previous works could not be tuned over a wide frequency range, however, the experiments had to rely upon accidental coincidences of the molecular absorption lines and laser frequencies.
KeywordsInfrared Absorption Double Resonance Tunable Diode Laser Induce Dipole Moment Accidental Coincidence
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