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Photodissociation dynamics of CH3I probed via multiphoton ionisation photoelectron spectroscopy

Photodissociation dynamics of CH3I probed via multiphoton ionisation photoelectron spectroscopy
Photodissociation dynamics of CH3I probed via multiphoton ionisation photoelectron spectroscopy

The dissociation dynamics of CH3I is investigated on the red (269 nm) and blue (255 nm) side of the absorption maximum of the A-band. Using a multiphoton ionisation probe in a time-resolved photoelectron imaging experiment we observe very different dynamics at the two wavelengths, with significant differences in the measured lifetime and dynamic structure. The differences are explained in terms of changes in excitation cross-sections of the accessible 3Q0 and 1Q1 states and the subsequent dynamics upon each of them. The measurements support the existing literature on the rapid dissociation dynamics on the red side of the absorption maximum at 269 nm which is dominated by the dynamics along the 3Q0 state. At 255 nm we observe similar dynamics along the 3Q0 state but also a significant contribution from the 1Q1 state. The dynamics along the 1Q1 potential show a more complex structure in the photoelectron spectrum and a significantly increased lifetime, indicative of a more complex reaction pathway.

1463-9076
11142-11149
Warne, Emily M.
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Downes-Ward, Briony
fa385501-e59a-4f84-b996-9bd924afe846
Woodhouse, Joanne
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Parkes, Michael A.
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Bellshaw, Darren
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Springate, Emma
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Majchrzak, Paulina
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Karras, Gabriel
fbb132bf-0e2a-4a12-9896-193e6eaef91f
Wyatt, Adam
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Kirrander, Adam
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Zhang, Yu
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Chapman, Richard
08941680-7e2c-4bf8-b499-b988e15ce933
Minns, Russell
85280db4-c5a6-4a4c-82fe-75693c6a6045
Warne, Emily M.
63799bdf-67fa-4dd8-adac-b963a9587a28
Downes-Ward, Briony
fa385501-e59a-4f84-b996-9bd924afe846
Woodhouse, Joanne
94d6c235-3e1e-44bc-8379-525862fd382c
Parkes, Michael A.
a53d8679-bd6a-442e-9370-f7dce3d449fc
Bellshaw, Darren
48dd9375-5b86-4d80-a00a-e5552cbd910c
Springate, Emma
f3004731-cf69-48bc-9816-1300a2276191
Majchrzak, Paulina
703902f3-2e66-41e6-bf89-5dea56ba2e08
Karras, Gabriel
fbb132bf-0e2a-4a12-9896-193e6eaef91f
Wyatt, Adam
e439e99f-0f0c-41d6-9db4-a5ed09c9cd4b
Kirrander, Adam
bf3ed07d-dbe0-4f83-bb97-a0f9c27363ca
Zhang, Yu
e47a1a80-1934-4180-8739-e03a0bbe23bd
Chapman, Richard
08941680-7e2c-4bf8-b499-b988e15ce933
Minns, Russell
85280db4-c5a6-4a4c-82fe-75693c6a6045

Warne, Emily M., Downes-Ward, Briony, Woodhouse, Joanne, Parkes, Michael A., Bellshaw, Darren, Springate, Emma, Majchrzak, Paulina, Karras, Gabriel, Wyatt, Adam, Kirrander, Adam, Zhang, Yu, Chapman, Richard and Minns, Russell (2019) Photodissociation dynamics of CH3I probed via multiphoton ionisation photoelectron spectroscopy. Physical Chemistry Chemical Physics, 21 (21), 11142-11149. (doi:10.1039/C9CP01477B).

Record type: Article

Abstract

The dissociation dynamics of CH3I is investigated on the red (269 nm) and blue (255 nm) side of the absorption maximum of the A-band. Using a multiphoton ionisation probe in a time-resolved photoelectron imaging experiment we observe very different dynamics at the two wavelengths, with significant differences in the measured lifetime and dynamic structure. The differences are explained in terms of changes in excitation cross-sections of the accessible 3Q0 and 1Q1 states and the subsequent dynamics upon each of them. The measurements support the existing literature on the rapid dissociation dynamics on the red side of the absorption maximum at 269 nm which is dominated by the dynamics along the 3Q0 state. At 255 nm we observe similar dynamics along the 3Q0 state but also a significant contribution from the 1Q1 state. The dynamics along the 1Q1 potential show a more complex structure in the photoelectron spectrum and a significantly increased lifetime, indicative of a more complex reaction pathway.

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CH3I_MPI (6) - Accepted Manuscript
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Accepted/In Press date: 7 May 2019
e-pub ahead of print date: 10 May 2019
Published date: 2019

Identifiers

Local EPrints ID: 430765
URI: http://eprints.soton.ac.uk/id/eprint/430765
ISSN: 1463-9076
PURE UUID: 5d93f14d-0163-4cce-9d2b-60cf145a821b
ORCID for Russell Minns: ORCID iD orcid.org/0000-0001-6775-2977

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Date deposited: 10 May 2019 16:30
Last modified: 07 Oct 2020 06:35

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Contributors

Author: Emily M. Warne
Author: Briony Downes-Ward
Author: Joanne Woodhouse
Author: Michael A. Parkes
Author: Darren Bellshaw
Author: Emma Springate
Author: Paulina Majchrzak
Author: Gabriel Karras
Author: Adam Wyatt
Author: Adam Kirrander
Author: Yu Zhang
Author: Richard Chapman
Author: Russell Minns ORCID iD

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