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Issue 22, 2018
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Ultrafast excited-state dynamics of 2,5-dimethylpyrrole

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The ultrafast excited-state dynamics of 2,5-dimethylpyrrole following excitation at wavelengths in the range of 265.7–216.7 nm is studied using the time-resolved photoelectron imaging method. It is found that excitation at longer wavelengths (265.7–250.2 nm) results in the population of the S1(1πσ*) state, which decays out of the photoionization window in about 90 fs. At shorter pump wavelengths (242.1–216.7 nm), the assignments are less clear-cut. We tentatively assign the initially photoexcited state(s) to the 1π3p Rydberg state(s) which has lifetimes of 159 ± 20, 125 ± 15, 102 ± 10 and 88 ± 10 fs for the pump wavelengths of 242.1, 238.1, 232.6 and 216.7 nm, respectively. Internal conversion to the S1(1πσ*) state represents at most a minor decay channel. The methyl substitution effects on the decay dynamics of the excited states of pyrrole are also discussed. Methyl substitution on the pyrrole ring seems to enhance the direct internal conversion from the 1π3p Rydberg state to the ground state, while methyl substitution on the N atom has less influence and the internal conversion to the S1(πσ*) state represents a main channel.

Graphical abstract: Ultrafast excited-state dynamics of 2,5-dimethylpyrrole

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Publication details

The article was received on 07 Feb 2018, accepted on 29 Mar 2018 and first published on 30 Mar 2018

Article type: Paper
DOI: 10.1039/C8CP00883C
Citation: Phys. Chem. Chem. Phys., 2018,20, 15015-15021

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    Ultrafast excited-state dynamics of 2,5-dimethylpyrrole

    D. Yang, Y. Min, Z. Chen, Z. He, K. Yuan, D. Dai, X. Yang and G. Wu, Phys. Chem. Chem. Phys., 2018, 20, 15015
    DOI: 10.1039/C8CP00883C

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