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A TPD and RAIRS comparison of the low temperature behavior of benzene, toluene, and xylene on graphite

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journal contribution
posted on 2023-06-09, 15:33 authored by Tara L Salter, James StubbingJames Stubbing, Lorna Brigham, Wendy BrownWendy Brown
The first comparative study of the surface behavior of four small aromatic molecules, benzene, toluene, p-xylene, and o-xylene, adsorbed on graphite at temperatures =30 K, is presented. Intermolecular interactions are shown to be important in determining the growth of the molecules on the graphite surface at low (monolayer) exposures. Repulsive intermolecular interactions dominate the behavior of benzene and toluene. By contrast, stronger interactions with the graphite surface are observed for the xylene isomers, with islanding observed for o-xylene. Multilayer desorption temperatures and energies increase with the size of the molecule, ranging from 45.5 to 59.5 kJ mol-1 for benzene and p-xylene, respectively. Reflection absorption infrared spectroscopy gives insight into the effects of thermal processing on the ordering of the molecules. Multilayer benzene, p-xylene, and o-xylene form crystalline structures following annealing of the ice. However, we do not observe an ordered structure for toluene in this study. The ordering of p-xylene shows a complex relationship dependent on both the annealing temperature and exposure.

Funding

Evolution of ices: From molecular cloud to ocean; G1613; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/M000869/1

History

Publication status

  • Published

File Version

  • Accepted version

Journal

The Journal of Chemical Physics

ISSN

0021-9606

Publisher

American Institute of Physics

Issue

164705

Volume

149

Page range

1-11

Department affiliated with

  • Chemistry Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2018-10-18

First Open Access (FOA) Date

2018-10-18

First Compliant Deposit (FCD) Date

2018-10-17

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