Related Experiment Video
Updated: Nov 2, 2025

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
Published on: August 6, 2018
Observation of vibronic emission spectrum of jet-cooled 3-chloro-4-fluorobenzyl radical
1Inorganic Material Team, Chemical Development Group, Dongwoo Fine-chem, Iksansi, Jeonrabukdo, Republic of Korea.
Abstract:
We observed the vibronic emission spectrum of 3-chloro-4-fluorobenzyl radical using a corona-excited supersonic jet expansion (CESE) from the precursor 3-chloro-4-fluorotoluene. From an analysis of the observed spectrum, we investigate the formation of the 3-chloro-4-fluorobenzyl and 4-fluorobenzyl radicals and explained the reaction paths with an ab initio study. The D1 → D0 transition energy and the frequencies of vibrational mode of the 3-chloro-4-fluorobenzyl radical were determined with a Franck-Condon simulation from density functional theory calculations in the D0 and D1 states.
Related Concept Videos
Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals
Electrophilic Aromatic Substitution: Chlorination and Bromination of Benzene
Radicals: Electronic Structure and Geometry
Accordingly, the structure of a trivalent radical lies between the geometries of carbocations and carbanions. An sp2-hybridized carbocation is trigonal planar, while an sp3-hybridized carbanion is trigonal pyramidal. Here, the difference in geometry is...
NMR Spectroscopy of Benzene Derivatives
UV–Vis Spectroscopy: Molecular Electronic Transitions
Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene

