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Ultrafast decay dynamics of electronically excited 2-ethylpyrrole.
- Source :
- Physical Chemistry Chemical Physics (PCCP); 8/28/2021, Vol. 23 Issue 32, p17625-17633, 9p
- Publication Year :
- 2021
-
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 S<subscript>1</subscript>(<superscript>1</superscript>πσ*) 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 1<superscript>1</superscript>ππ* state, having a lifetime of 75 ± 15 and 48 ± 10 fs for the longer and shorter pump wavelengths, respectively. Internal conversion to the S<subscript>1</subscript>(<superscript>1</superscript>πσ*) state might be one of the decay mechanisms of the 1<superscript>1</superscript>ππ* state. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14639076
- Volume :
- 23
- Issue :
- 32
- Database :
- Complementary Index
- Journal :
- Physical Chemistry Chemical Physics (PCCP)
- Publication Type :
- Academic Journal
- Accession number :
- 151975664
- Full Text :
- https://doi.org/10.1039/d1cp01090e