Imaging the photodissociation dynamics of internally excited ethyl radicals from high Rydberg states.

The site-specific hydrogen-atom elimination mechanism previously reported for photoexcited ethyl radicals (CHCH) [D. V. Chicharro , , 2019, , 6494] is interrogated in the photodissociation of the ethyl isotopologues CDCD, CHCD and CDCH through the velocity map imaging (VMI) detection of the produced hydrogen- and deuterium-atoms.

Imaging the Photodissociation Dynamics and Fragment Alignment of CHBrI at 193 nm.

The photodissociation dynamics and photofragment alignment of bromoiodomethane (CHBrI) have been studied at 193 nm using a double experimental and theoretical approach. In addition, the ultraviolet (UV)-vacuum ultraviolet (VUV) absorption spectrum of gas phase CHBrI has been measured in the photon energy range of 5-11 eV using the VUV Fourier transform spectrometer (FTS) at the VUV beamline DESIRS of the synchrotron SOLEIL facility. The slice imaging technique in combination with resonance enhanced multiphoton ionization (REMPI) detection of the Br() and I() (with = 3/2 and 1/2 for Br/I and Br*/I*, respectively) atomic photofragments have been used to produce experimental translational energy and angular distributions, which were analyzed to deliver, on one hand, the partitioning of the available energy among the different degrees-of-freedom of the photofragments and, on the other, the photofragment polarization in terms of () alignment parameters.

Site-specific hydrogen-atom elimination in photoexcited alkyl radicals.

A prompt site-specific hydrogen-atom elimination from the α-carbon atom (Cα) has been recently reported to occur in the photodissociation of ethyl radicals following excitation at 201 nm [Chicharro et al., Chem. Sci.

Velocity map imaging study of the photodissociation dynamics of the allyl radical.

The photodissociation of the allyl radical (CH[double bond, length as m-dash]CH-CH˙) following excitation between 216 and 243 nm has been investigated employing velocity map imaging in conjunction with resonance enhanced multiphoton ionization to detect the hydrogen atom and CH(ν = 0) produced. The translational energy distributions for the two fragments are reported and analyzed along with the corresponding fragment ion angular distributions. The results are discussed in terms of the different reactions pathways characterizing the hydrogen atom elimination and the minor methyl formation.