Abstract

Strong double-resonance signals are observed in silane pumped with a TEA-CO 2 laser and probed with a tunable diode laser. The lineshapes of these signals have been modeled with an extension of three level density-matrix theory to the case of a large bandwidth pump laser. Up to 50% of the ground state population can be transferred to specific rotational levels of the dyad by CO 2 laser pumping. Collision-mediated two-photon excitation to triad levels has also been observed.

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