The lifetime, coherence narrowing, and collision broadening of the 7 S~~2 excited state of atomic thallium has been studied by the technique of zero-field level-crossing spectroscopy.The lifetime of the 7 S&&2 state is determined to be 7.55(0.08) nsec. The full coherencenarrowing effect gave a branching ratio, from E=1 of 72$&~2 to the ground state, of 43/~. The cross section for thallium-thallium resonance-broadening collisions is a.T& T& = 5. 38(0.49)x 10 /v cm . The effect of 426-torr helium on the thallium lifetime, coherence narrowing,

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SUMMARYDensity functional theory (DFT) was employed to obtain configurations and corresponding interaction energies for Ptn (n = 4–13) clusters on a single wall carbon nanotube (SWCNT). The force‐matching method (FMM) was applied to fit the potential parameters for Ptn and the SWCNT by reference data obtained from these DFT calculations. To elucidate the dynamical behavior of Pt clusters on (5,5) and (9,0) SWCNT types, molecular dynamics was applied using the fitted potential parameters from FMM. We then we investigated the size effect of the Pt clusters at different temperatures. In addition, the square displacement was utilized to analyze their movement on the nanotube. Copyright © 2013 John Wiley & Sons, Ltd.

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