Abstract
Methyl zinc CH3Zn generated in the photolysis of dimethyl zinc (CH3)2Zn at 223 nm was detected with laser-induced fluorescence (LIF) via the A∼2E-X∼2A1 transition. The time-resolved LIF intensity of the level X∼2A1,00 grew with time, indicating that the nascent CH3Zn was highly vibrationally excited. The He-pressure dependence of the growth rates of the LIF intensity was analyzed by the kinetic scheme with a rate-determining step, giving the rate coefficient for vibrational relaxation to the X∼2A1,00 level to be [8.2±0.9(2σ)]×10-13 cm3 molecule−1 s−1. The probability of vibrational relaxation of CH3Zn per collision with He nicely correlates with those of non- or less-polar diatomic molecules.
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