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首页> 外文期刊>Physical chemistry chemical physics: PCCP >Excited-state lifetime of propadienylidene, 1-C3H2
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Excited-state lifetime of propadienylidene, 1-C3H2

机译：丙烯二烯1-C3H2的激发态寿命

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摘要

The excited-state dynamics of the singlet carbene propadienylidene, 1-C3H2, were investigated by femtosecond time-resolved photoionisation. The carbene was excited into the C ~1A_1 state with 250 nm pulses and the subsequent excited state dynamics were probed by multiphoton ionization with 800 nm pulses. The lifetime of the C~2A_1 state was determined to be 70 fs. In agreement with recent nanosecond experiments, we assume that the carbene deactivates to the electronic ground state where it subsequently dissociates. Since propadienylidene was generated from 3-bromo-1-iodopropyne, two further radical intermediates were studied, IC3H2 and C3H2Br. For both species, an ultrafast excited state decay was observed with an upper limit of 40 fs for the respective lifetimes.
机译：通过飞秒时间分辨光电离研究了单线态碳烯丙烯二烯（1-C3H2）的激发态动力学。卡宾用250 nm脉冲激发成C〜1A_1状态，随后通过800 nm脉冲的多光子电离探测随后的激发态动力学。 C〜2A_1状态的寿命确定为70 fs。与最近的纳秒实验一致，我们假设卡宾会失活至电子基态，然后在基态解离。由于丙二烯叉是由3-溴-1-碘丙炔生成的，因此研究了另外两个自由基中间体，IC3H2和C3H2Br。对于这两种物质，在各自的寿命中观察到超快激发态衰减，上限为40 fs。

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