Dynamics of Cs2 excited by a synchronously pumped mode-locked dye laser, and the effects of magnetic field

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Abstract
When the Cs2 molecule was excited by a dye‐laser line of 15 841 cm−1, the fluorescence from the energy‐transferred states as well as the resonance fluorescence fromthe optically excited levels, which were assigned to C 1Πu and d 3Πu, were observed. We measured the picosecond time‐resolved fluorescence intensity by changing the vapor pressure and the temperature. The decay curves were analyzed by a least‐squares curve fitting, and the lifetimes in the collisionless limit and the collision cross sections were determined. From the consideration of the rise and decay rates of fluorescence intensities, the kinetic pathways of the collisional energy transfer were estimated. The intensity of the fluorescence d 3Πu–X 1Σ+g was found to decrease appreciably in the presence of an external magnetic field. The magnetic field effect was estimated to be due to the predissociation induced by an electronic Zeeman interaction between the d 3Πu and c 3Σ+u states.