Issue 32, 2021

Ultrafast decay dynamics of electronically excited 2-ethylpyrrole

Abstract

The excited-state decay dynamics of 2-ethylpyrrole following UV excitation in the wavelength range of 254.8–218.0 nm is investigated in detail using the femtosecond time-resolved photoelectron imaging method. The time-resolved photoelectron spectra and photoelectron angular distributions at all pump wavelengths are carefully analysed and the following picture is derived: at the longest pump wavelengths (254.8, 248.3 and 246.1 nm), 2-ethylpyrrole is excited to the S1(1πσ*) state having a lifetime of about 50 fs. At 248.3, 246.1 and 237.4 nm, another excited state of Rydberg character is excited. The lifetime of this state is ∼570 fs at 237.4 nm and becomes slightly longer at other two pump wavelengths. At the shortest pump wavelengths (230.8 and 218.0 nm), 2-ethylpyrrole is excited to a state which is tentatively assigned to the 11ππ* state, having a lifetime of 75 ± 15 and 48 ± 10 fs for the longer and shorter pump wavelengths, respectively. Internal conversion to the S1(1πσ*) state might be one of the decay mechanisms of the 11ππ* state.

Graphical abstract: Ultrafast decay dynamics of electronically excited 2-ethylpyrrole

Supplementary files

Article information

Article type
Paper
Submitted
11 Mar 2021
Accepted
23 Jul 2021
First published
24 Jul 2021

Phys. Chem. Chem. Phys., 2021,23, 17625-17633

Ultrafast decay dynamics of electronically excited 2-ethylpyrrole

W. Yuan, D. Yang, B. Feng, Y. Min, Z. Chen, S. Yu, G. Wu and X. Yang, Phys. Chem. Chem. Phys., 2021, 23, 17625 DOI: 10.1039/D1CP01090E

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