Excited state dynamics of protonated keto uracil: intersystem crossing pathways in competition

Abstract

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The combination of laser photodissociation, action spectroscopy, and mass spectrometry to identify and separate isomers

“…This arrangement of the isomer-selective pump-probe experiment was employed to investigate protonated tyrosine isomers 131 and nucleobase isomers. 117,132 Protonated tyrosine conformers are found to have similar excited state lifetimes at 1610 cm À1 above the 0-0 transition (ca. 450 ps).…”

“…Other groups have deployed femtosecond or picosecond pump-probe laser configurations combined with photodissociation mass-spectrometry to interrogate excited-state lifetimes of ions in tandem time-of-flight mass spectrometers, [133][134][135] triple-quadrupole mass spectrometers, 136 ion storage rings, 137,138 custom built ion traps at room temperature, [139][140][141] custom built ion traps that are cryogenically cooled, 81,85,132,142 and commercial ion traps. 87,[143][144][145][146] There are also setups using electronic delays for pump-probe photodissociation on the nanosecond to millisecond timescale.…”

“…87,[143][144][145][146] There are also setups using electronic delays for pump-probe photodissociation on the nanosecond to millisecond timescale. 117,132,[146][147][148][149][150][151] The excited 63 This journal is © The Royal Society of Chemistry 2022 state dynamics of few gas-phase ions has been investigated experimentally or computationally, especially relative to solution-phase species.…”