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Ultrafast excited-state dynamics of 2,4-dimethylpyrrole.
- Source :
- Physical Chemistry Chemical Physics (PCCP); 11/21/2017, Vol. 19 Issue 43, p29146-29152, 7p
- Publication Year :
- 2017
-
Abstract
- The ultrafast excited-state dynamics of 2,4-dimethylpyrrole following excitation at wavelengths in the range of 255.8–199.7 nm are studied using the time-resolved photoelectron imaging method. It is found that excitation at longer wavelengths (255.8, 250.0, 246.0 and 242.0 nm) results in population of the S<subscript>1</subscript>(<superscript>1</superscript>πσ*) state, which decays out of the photoionization window in less than 30 fs. At 237.7 nm, the second <superscript>1</superscript>πσ* state is excited, which decays in about 130 fs. At shorter pump wavelengths (231.8, 224.8, 217.5 and 199.7 nm), the assignments are less clear-cut. We tentatively assign the initially photoexcited states to the <superscript>1</superscript>π3p Rydberg states, which decay in about 60 fs, with internal conversion to the S<subscript>1</subscript>(<superscript>1</superscript>πσ*) state as one of the decay channels. The lifetimes of these <superscript>1</superscript>π3p Rydberg states vary little with the pump wavelengths in this wavelength range. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14639076
- Volume :
- 19
- Issue :
- 43
- Database :
- Complementary Index
- Journal :
- Physical Chemistry Chemical Physics (PCCP)
- Publication Type :
- Academic Journal
- Accession number :
- 126800845
- Full Text :
- https://doi.org/10.1039/c7cp06292c