A velocity map ion-imaging study on C2H5SH and C3H7SH photodissociation at 243 nm

Ion imaging methods are making ever greater impact on studies of gas phase molecular reaction dynamics. This article traces the evolution of the technique, highlights some of the more important breakthroughs with regards to improving image resolution and in image processing and analysis methods, and then proceeds to illustrate some of the many applications to which the technique is now being applied--most notably in studies of molecular photodissociation and of bimolecular reaction dynamics.

show abstract

Photodissociation dynamics of ethanethiol in clusters: complementary information from velocity map imaging, mass spectrometry and calculations

Svrčková

Pysanenko

Lengyel

et al. 2015

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

We investigate the solvent effects on photodissociation dynamics of the S-H bond in ethanethiol CH3CH2SH (EtSH). The H fragment images are recorded by velocity map imaging (VMI) at 243 nm in various expansion regimes ranging from isolated molecules to clusters of different sizes and compositions. The VMI experiment is accompanied by electron ionization mass spectrometry using a reflectron time-of-flight mass spectrometer (RTOFMS). The experimental data are interpreted using ab initio calculations. The direct S-H bond fission results in a peak of fast fragments at Ekin(H) ≈ 1.25 eV with a partly resolved structure corresponding to vibrational levels of the CH3CH2S cofragment. Clusters of different nature ranging from dimers to large (EtSH)N, N ≥ 10, clusters and to ethanethiol clusters embedded in larger argon "snowballs" are investigated. In the clusters a sharp peak of near-zero kinetic energy fragments occurs due to the caging. The dynamics of the fragment caging is pictured theoretically, using multi-reference ab initio theory for the ethanethiol dimer. The larger cluster character is revealed by the simultaneous analysis of the VMI and RTOFMS experiments; none of these tools alone can provide the complete picture.

show abstract

scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.

Contact Info

hi@scite.ai

10624 S. Eastern Ave., Ste. A-614

Henderson, NV 89052, USA

Blog Terms and Conditions API Terms Privacy Policy Contact Cookie Preferences Do Not Sell or Share My Personal Information

Made with 💙 for researchers

Part of the Research Solutions Family.

A velocity map ion-imaging study on C2H5SH and C3H7SH photodissociation at 243 nm

Cited by 5 publications

References 12 publications

Ultraviolet photodissociation of 1-bromopropane at 234 and 267nm

Ultraviolet photodissociation of 1-bromopropane at 234 and 267nm

Imaging the dynamics of gas phase reactions

Photodissociation dynamics of ethanethiol in clusters: complementary information from velocity map imaging, mass spectrometry and calculations

Contact Info

Product

Resources

About